33 tips to help boost iPhone battery life

In this tutorial we will show you a few tricks to get more battery life out of your iPhone 6, iPhone 6 Plus, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s, iPhone 4 or older iPhone. Follow this advice to make your iPhone battery last longer in iOS 8 (these tips will also work for iOS 7). We also take a look at Apple's new battery saving features coming in iOS 9.

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  • Introduction 1
  • iOS 9's battery booster 2
  • Faulty battery? 3
  • App drain 4
  • Tweek brightness 5
  • Auto-lock 6
  • Airplane Mode 7
  • Disable Wi-Fi 8
  • Disable Bluetooth 9
  • Turn off AirDrop 10
  • Disable 3G 11
  • iPhone volume 12
  • Vibrating 13
  • Visual effects 14
  • Avoid games 15
  • Camera action 16
  • Spotlight 17
  • Notification Centre 18
  • Email 19
  • Email accounts 20
  • iCloud 21
  • iCloud drive 22
  • Auto time zone 23
  • Location Services 24
  • Siri 25
  • App refresh 26
  • App updating 27
  • Facebook 28
  • Quitting 29
  • Battery percentage 30
  • Calibrate 31
  • How much? 32
  • Plug in 33
  • Battery pack 34
  • Turn off 35
  • Finally 36
  • More stories
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Tip 1 of 36: Tips for keeping your iPhone battery running all day

One of the inescapable truths of modern technology is its penchant for regularly sucking from the national grid, like some kind of crazed electronic vampire. You might consider your iPhone or iPad to be the most amazing technology in the world, but they’re little more than metal-and-glass slabs when out of juice. Thankfully, it doesn't have to be like that. We've got some brilliant battery-saving tricks and tips that will help you keep the iPhone's battery running all day long. Here's how to improve your iPhone's battery life in iOS 8 and iOS 7, and what's coming in iOS 9 to help make your battery last even longer.

These tips will also help you to get your iPhone to last a little bit longer when you’re away for the weekend without your charging cable; during a power-cut; or when you are pootling along on a slow train, trying to coax your iPhone into surviving what would otherwise be a long and boring journey home.

Follow these tricks to give your iPhone, iPad or iPod touch enough power to last those crucial extra minutes – or even hours. And, if you are experiencing battery problems with your iPhone on a daily basis - perhaps you find that you can't get through a day on a single charge since updating to iOS 8 – follow this advice and extend your iPhone battery life.

Here, then, are the best ways to improve your iPhone's battery life in iOS 8, from system-wide settings worth tweaking to third-party apps that you should stop - or start - using in order to preserve battery life. These tips will also work for iOS 7 unless indicated otherwise.

For more iPhone tips read our article on maximising space on your iPhone, follow our tips to get more iPhone capacity when you need it. Don't miss our top iOS 8 tips article here: 29 iOS 8 tips & tricks: Get to know iOS 8's best new features

Plus: Advanced iOS 8 tips.  Also read: How to make your Apple Watch battery last longer

Next Tip »

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One of the inescapable truths of modern technology is its penchant for regularly sucking from the national grid, like some kind of crazed electronic vampire. You might consider your iPhone or iPad to be the most amazing technology in the world, but they’re little more than metal-and-glass slabs when out of juice. Thankfully, it doesn't have to be like that. We've got some brilliant battery-saving tricks and tips that will help you keep the iPhone's battery running all day long. Here's how to improve your iPhone's battery life in iOS 8 and iOS 7, and what's coming in iOS 9 to help make your battery last even longer.

These tips will also help you to get your iPhone to last a little bit longer when you’re away for the weekend without your charging cable; during a power-cut; or when you are pootling along on a slow train, trying to coax your iPhone into surviving what would otherwise be a long and boring journey home.

Follow these tricks to give your iPhone, iPad or iPod touch enough power to last those crucial extra minutes – or even hours. And, if you are experiencing battery problems with your iPhone on a daily basis - perhaps you find that you can't get through a day on a single charge since updating to iOS 8 – follow this advice and extend your iPhone battery life.

Here, then, are the best ways to improve your iPhone's battery life in iOS 8, from system-wide settings worth tweaking to third-party apps that you should stop - or start - using in order to preserve battery life. These tips will also work for iOS 7 unless indicated otherwise.

For more iPhone tips read our article on maximising space on your iPhone, follow our tips to get more iPhone capacity when you need it. Don't miss our top iOS 8 tips article here: 29 iOS 8 tips & tricks: Get to know iOS 8's best new features

Plus: Advanced iOS 8 tips.  Also read: How to make your Apple Watch battery last longer

Step 2 of 36: Battery saving in iOS 9

When iOS 9 arrives later this year, there will be new battery saving features that Apple says should help your iPhone's battery life last much longer. Not only is there a new system-wide battery-saving mode, but Apple also says that iOS 9 should help your battery last for an extra hour without even needing that battery-saving mode thanks to tweaks to make it less power-hungry.

With the new battery saving mode, when your iPhone drops below 20 percent power, you'll see a message that warns you of this fact and offers Low Power Mode. Turning on Low Power Mode will reduce animations throughout the system, decrease the time before the screen darkens and generally make every effort to eke out your battery life for a little longer.

You can activate Low Power Mode at other times: look for the option in the new Battery section of Settings once you've upgraded to iOS 9. You'll be able to tell that Low Power Mode is in effect by looking at the battery indicator at the top of the screen. It's normally green or red, but if Low Power Mode is on, it'll be yellow.

You might also like: iOS 9 tips

Step 3 of 36: How bad is your iPhone battery life really?

A quick way to check whether there really is a problem with the battery in your iPhone is to head over to Settings > General > Usage > Battery Usage to check your Usage and Standby times. The Usage time is how long you have used the phone since the last charge, and Standby indicates the total time that's passed since the last charge. Expect usage to be a lot lower than Standby (unless you have been using your iPhone none stop since unplugging it).

To test your battery make a note of the usage and standby times and then put the device to sleep by pressing the on/off switch at the top. After five minutes check the changes in the times. If your device is working correctly, the usage time should have have gone up by less than a minute, while the standby time should have gained five minutes. If you see more than a minute increase on the Usage time, something is stopping your phone from sleeping and you have a battery drain problem.

According to Apple Store genius, Scotty Loveless, chances are that an app or your email setting are responsible for the drain rather than the battery or the iPhone being at fault.

Follow the following tips to stop unnecessary drain when your iPhone isn't in use, we also have a number of tips that will increase battery life in situations when you need the extra boost.

Step 4 of 36: What apps are using the battery

In iOS 8 you can see exactly which apps are the biggest battery drainers. Go to Settings > General > Usage > Battery Usage and scroll down to see which of your apps were the biggest battery guzzlers in the past 24 hours, or last 7 days.

Expect to see Facebook up the top, Safari also seems to be quite draining. But obviously these are also frequently used apps.

Not any apps that highlight background activity as battery draining, perhaps you need to address what this background activity is. We discuss this below.

Step 5 of 36: Increase battery life: turn down brightness

That iPhone 5s you are lugging around offers a 1,136x640-pixel resolution at 326 ppi, that's not far off that of an 11in MacBook Air  (1,366x768). It should therefore come as no surprise the screen is one of your iOS device’s primary power drains.

Lighting the pixels on your iPhone's Retina display requires a lot of energy. In fact, in testing, excessive screen brightness was the single biggest iPhone battery killer we found. At full brightness, an iPhone 5 lasted 6 hours, 21 minutes while playing 720p video. When we set the screen to half brightness, the phone lasted 9 hours, 48 minutes. That's a huge difference.

Luckily you can save some battery life by adjusting the iPhone’s brightness. A quick fix is to turn down brightness using the slider in Control Center, accessed by swiping up from the bottom of the display. Drag the brightness slider as far left as possible, but with a setting that still leaves your device usable.

You should also open the Settings app, access Display & Brightness and make sure that Auto-Brightness is turned off, this will stop your phone turning up the brightness every time it deems it necessary.  (Although Apple suggests that Auto-brightness is designed to conserve battery life).

(In iOS 7 this is called Wallpapers & Brightness.)

Step 6 of 36: Save your battery: Auto-lock your iPhone

While the screen of your iPhone is on, you're consuming power, so make sure that your iPhone isn't awake when you don't need it to be. If you want to get the maximum battery life from your iPhone, set the Auto Lock to 1 minute.

Venture into Settings > General > Auto-Lock and set your iPhone to sleep after one minute of inactivity. This will provide a substantial improvement to battery life over time. If you really want to max out your iPhone's battery life, try to get into the habit of pressing the Sleep/Wake button at the top of your iPhone as soon as you've finished using it.

Step 7 of 36: Get more battery life by turning on Airplane Mode

One of the biggest drains of battery life is the antenna, because it’s constantly checking for nearby cellular and Wi-Fi networks. Simply moving around with the phone in your pocket will drain its battery, as it moves from within range of one base station to another.  

If don’t need to access data, make, or receive, calls, and you don't require GPS (for maps) you could put the phone into flight mode and stop all use of the iPhone's antenna. It's easy to switch on Airplane Mode, just swipe up on Control Centre and tap the airplane icon on the top left. Alternatively, tap Settings and set Airplane mode to On

If you need to use data, you can still use Wi-Fi when Airplane Mode is turned on – after switching on Airplane Mode, tap the WiFi icon beside it and connect to the Wi-Fi network of your choice.

It's a good idea to enable Airplane Mode if you are in an area of low coverage as the iPhone will be working hard to power the antenna to maintain a data connection. If you move into an area with a poor signal - perhaps the basement of a store – your iPhone will start desperately trying to hang on to signal at the expense of your battery.

This drain on your battery will happen even if you have a strong Wi-Fi connection, because your phone still needs the cellular connection for calls and SMS messages, according to Apple Store genius, Scott Loveless. So, if you're office is in an area of poor cellular coverage, for example, your battery may spend the day trying to maintain a cellular signal even while your Wi-Fi signal is great.

Step 8 of 36: Extend battery life by disabling Wi-Fi

If you still need a cellular connection but can live without Wi-Fi, you can disable Wi-Fi by swiping up to reveal Control Centre and tapping the Wi-Fi icon to turn it off (if it's off the Wi-Fi icon will be black). This will stop your phone from hunting around for Wi-Fi networks it could join.

There are a few situations where avoiding using Wi-Fi might stop battery drain. If the Wi-Fi signal is poor then your iPhone will require more power to transmit and receive data. Similarly, if you are rarely in a place where you could join a Wi-Fi hotspot then there is little point in the iPhone hunting for one.

However, we wouldn't recommend using 3G over Wi-Fi if there is a Wi-Fi network available. There is usually no financial cost associated with using a Wi-Fi network, while you may have to keep within a data allowance as part of your network contact. Read: How to avoid going over your data allowance for your iPhone contract

Another reason is that your iPhone consumes less power accessing data over Wi-Fi than it does when doing the same task over Wi-Fi. This is why Apple quotes different battery life for 3G compared to Wi-Fi: Internet use on the iPhone 6 Plus is up to 12 hours on 3G, up to 12 hours on LTE, up to 12 hours on Wi?Fi. The iPhone 6 manages up to 10 hours on 3G, up to 10 hours on LTE, up to 11 hours on Wi?Fi. In comparison, both the iPhone 5s and iPhone 5c is 8 hours on 3G, up to 10 hours on LTE, and 10 hours on Wi-Fi. The iPhone 4s offers 6 hours Internet use on 3G and 9 hours over Wi-Fi.

Tap Settings > Wi-Fi and ensure Ask to Join Networks is set to On. This will help you spot open networks to join.

Step 9 of 36: Stop iPhone battery drain: Disable Bluetooth

If you have Bluetooth on the chances are you don't need it. Swipe up on Control Centre to check if Bluetooth is on, if it is you will see the B-like icon highlighted in white. Bluetooth is usually left on after an iOS update is installed, so you may not even be aware that it is on. If it is, tap the Bluetooth icon to turn it off. You can also tap General > Bluetooth and set Bluetooth to Off.

Bluetooth is considered to be a battery-drainer. If you're not using it to connect to a speaker, headphones, or other accessory, or to use the new Continuity features in iOS 8, then switch it off.

Step 10 of 36: Turn off AirDrop to stop iPhone battery drain

One iPhone service that requires Bluetooth is AirDrop. New in iOS 7, AirDrop allowed you to transfer photos and other files to and from nearby iPhones with the same feature switched on. Unfortunately, it's a battery killer, because of the way AirDrop seeks out nearby iPhones to hook up with.

You can switch off AirDrop in the Control Centre (swipe upwards from the bottom of the screen). Only turn on AirDrop when it's needed.

Read about how to AirDrop from iPhone to Mac and Mac to iPhone

Step 11 of 36: Disable 3G to save iPhone battery power

If you can survive without data but still need to be contactable you could turn off 3G (or LTE 4G if you have it). Your data connection can be disabled in the Cellular section of Settings. Go to Settings > Cellular and switch Cellular Data to off. If you have an iPhone that is capable of 4G you can separately turn off 4G here as well. We recommend that you do this if you don't actually have a 4G contract.

If you aren’t using it then switching off cellular data will increase the battery length, the benefit, when compared to switching to Airplane Mode is that you will only disable the cellular data portion of your signal, e.g. EDGE, 3G, 4G, or LTE. Normally your iPhone receives two signals at once: one for calls and SMS, and one for data, now it only receives the signal for calls and SMS – which means you are still contactable, you just can't browse Facebook (unless you can access a Wi-Fi network).

You should also note that, according to Apple Genius Scotty Loveless, the signal strength meter on the iPhone only shows the signal strength for the non-data connection, which means your iPhone could show 2-3 dots in iOS 7 for a standard cellular connection, but actually have a very poor 3G or LTE connection thus causing your iPhone to go into heavy search mode.

Step 12 of 36: Turn down iPhone volume

It might surprise you but the volume setting affects battery life too, so if you are playing music or other audio from your phone, turn it down using the volume buttons.

Of course you could save battery power by not playing music, or you could switch to headphones, which won't require as much power as the iPhone's internal speakers. Note that the music equaliser also takes up a surprising amount of power.

Tap Settings > Music and make sure EQ is turned to Off.

Step 13 of 36: Stop your iPhone vibrating

Head to Settings > Sounds and turn off both of the vibrate options, because your device rattling around like crazy when a slew of messages arrives drains the battery like nobody’s business.

There are dozens of annoying jingles you can choose from to announce to the world that someone’s just sent you a message without the accompanying vibration.

Step 14 of 36: Save battery by toning down visual effects in iOS 7 and iOS 8

Assuming you don’t suffer from some kind of motion sickness or balance disorder, the various 3D effects introduced in iOS 7 might excite you. These pretty Parallax effects that make your icons and notifications appear to float over the wallpaper might look nice, but they constantly use your iPhone's graphics processor and are therefore a drain on the battery that you could probably manage without if you were trying to get a last half hour of use out of your iPhone on a long journey home.

One thing you can do is switch to static rather than dynamic wallpaper - the iOS 7-style wallpaper that moves around as you tilt your phone. This will cut down the power drain a little. When you set a new Wallpaper, tap where it says 'Perspective Zoom: On' to turn it off.

You can also go to Settings > General > Accessibility > and switch on Reduce Motion to temporarily turn off all the parallax effects. Note that this will replace many system zoom effects with cross-fades which don't look as nice, but might just give you those extra few minutes power that you need.

Step 15 of 36: Avoid games and high-impact apps to save power

It sounds obvious to say your iPhone’s battery is drained quicker the more you use your phone, but how fast it falls from 100 percent to nothing entirely depends on what apps you use. Some apps burn through your battery much faster than others. Heavy use of the processor and GPU, for 3D games, or the GPS chip, for maps and location-based apps, uses up more energy than reading content in iBooks, for example.

If you play games with rich, detailed visuals, such as Infinity Blade 3, or 3D racing games like CSR Racing, your iPhone’s battery will be drained quickly, so if you’re away from a charger and waiting for an important call, playing these sort of games is not a good idea if your battery levels are already low.

If you’re on the way home and low on power, reading apps like Kindle or Instapaper won’t drain what’s left of your battery terribly quickly. However, it probably wouldn’t be a smart move to start playing your favourite TV series, or, worse, the latest 3D gaming blockbuster. In fact, even quite simple games often utilise complex 3D trickery, and so when in the red battery-wise, avoid them entirely.

Step 16 of 36: Improve iPhone battery life: Minimise Camera use

Isn't it always the case that the battery on your iPhone runs out just as you take the perfect shot on a night out with your friends?

If you are running low on battery you should keep your Camera app usage to a minimum, and definitely avoid using the flash.

Step 17 of 36: Turn off Spotlight to save battery power

Like on the Mac, Spotlight in iOS is constantly working away in the background, indexing your data so you can easily find it later.

Usually, that’s great, but not when you’re short on power. Settings > General > Spotlight Search enables you to turn off some or all Spotlight categories.

Step 18 of 36: Stop Notification Centre draining your battery

Similarly, Settings > Notification Center might be worth a visit, although there’s sadly no global off switch, and, if you are running out of power, editing notification settings for all your apps might take more power than it saves, due to how long it takes.

Each time a notification is received, the iPhone’s screen lights up and it plays a sound, which uses energy. Every message wakes your device for 5 to 10 seconds, and that can add up, if you get a lot of notifications every day, to a small percentage of your daily battery charge.

We can live without updates about Words With Friends, so it makes sense to turn off notifications for non-critical apps (incidentally, it was the persistent notifications in that app that lead us to delete it in the end).

To stop notifications, go to Settings > Notification Centre and scroll down. About half way down the page, under the INCLUDE section, you’ll see a list of the iPhone’s built-in apps, as well as third-party apps installed on your handset. Tap on each one you’re not interested in, and select the None option to stop it from sending Banners and Alerts to notify you. You can also remove apps from Notification Centre by Switching the slide in Show in Notification Centre to off.

Read about Notification Centre in iOS 8

Step 19 of 36: Push off! Stop push email on your iPhone

You can set your phone to Push - or rather pull down - email as soon as it arrives on the server. This is handy if you never want to miss an email and it can save you time because you'll be able to see all your emails as soon as you open the Mail app. But when your iPhone is running on fumes, it’s best to only grab new emails when you really need them.

Push constantly polls the server so when you get a new email the iPhone knows instantly. You can even get a notification every time you receive an email.

If you don't need to know every time an email comes in turn it Push off. Tap Settings > Mail, Contacts, Calendars and tap Fetch New Data and turn Push to Off.

You can instead choose to Fetch your emails at certain intervals. Using Push data for email uses far more data (and power) than Fetch. Choose from Every 15 Minutes, Every 30 Minutes, Hourly, or Manually so you only grab emails when you choose to.

If you have push email on it will stop your phone from sleeping, especially if you have an Exchange email account, you can expect battery life to be seriously hindered.

Step 20 of 36: Improve iPhone battery life: Remove multiple email accounts

Multiple email accounts will consume use of your precious battery life. Try to fold all your different accounts into just the one email service then remove the additionals by tapping Settings > Mail, Contacts, Calendars and choosing an account and tapping Delete Account.

In the case of Gmail, for example, you could turn Mail off but keep your Gmail Calendar synced.

Step 21 of 36: Improve iPhone battery life: Turn off iCloud

Similarly, if you want to make that last bit of juice last longer, turn of anything you don't need to be synced via iCloud.

iCloud uses a fair bit of data and power, so you can save battery life by turning off unused features. Tap Settings > iCloud and turn off everything you don’t really use, for example, you may not need your Safari bookmarks to be available on the iPhone.

iCloud backup only works when the phone is plugged in so you can leave that on.

Step 22 of 36: iCloud drive battery drain

Be sure to check the iCloud Drive tab to see if there are any apps storing data in the cloud that you don't need access too, for example Pages or Keynote.

Step 23 of 36: Improve iPhone battery life: Turn off auto time zone

The iPhone can automatically update its time depending on where you are in the world. Because the iPhone determines the correct time via Location Services, this uses a small amount of power. Tap Settings > General > Date & Time and change Set Automatically to Off.

Step 24 of 36: Stop Location Services from draining your iPhone battery

Most of the time it is not iOS itself that is causing the iPhone's battery to drain quickly, but all the apps that are running on it. There are a number of apps that utilise location services on your iPhone and they can play their part in draining your battery too. It’s even more frustrating when it's not obvious why some of them need to know where you are in the first place.

To stop apps from using Location Services, tap Settings > Privacy > Location Services and either turn off Location Services altogether, or deselect any apps that you don't need to access your GPS.

Step 25 of 36: Stop Siri draining battery

Even Siri can be a bit of a drain on battery life. Go to Settings > General > Siri and make sure that Raise to Speak isn't switched on.

That sensor is active whenever your phone is unlocked so if it detects that you are holding your phone is next to your face it will make Siri listen automatically.

Step 26 of 36: Disable background app refresh to save battery

Before iOS 7, if you switched between apps by double tapping the home button, the old app would be put into a frozen state, with limited access to system resources. iOS 7 allowed background apps to periodically refresh their data, and so does iOS 8, so when you open the app again, you’ll see the latest updates immediately. 

This can be useful in certain circumstances, but most of the time is just wasting processing power and battery juice updating apps that you don't really care about. 

If you want to get the most out of your battery, turning off Background App Refresh will help.  Go to Settings > General > Background App Refresh. Here you can turn off Background App Refresh altogether, or prune the list down on an app-by-app basis.

Step 27 of 36: Save iPhone battery by disabling app updating

Another new feature added in iOS 7, was the ability to have apps update without you manually telling them to. The feature remains in iOS 8.

It is a useful feature that means that apps will always be up-to-date, but can be a drain on your battery. Also, some people prefer to update on a case-by-case basis, since occasionally a developer will update an app in a way that reduces user satisfaction.

Luckily, you can stop apps from auto-updating. Switch off automatic updates in Settings > iTunes & App Store, scroll to Automatic Downloads and switch off Updates. If you decide to leave any of these Automatic Downloads settings on, ensure that the switch for Use Cellular Data isn't turned on if you have limited data allowance (read more about not running out of your iPhone data allowance here).

Step 28 of 36: Facebook to blame for battery wows

Of all the background refreshing and location service using apps, one stands out as the worst offender. In this blog, former Apple Genius Bar worker Scotty Loveless recommends that you disable location and background app refresh for Facebook.

Loveless claims that the Facebook app consumes a lot of memory and processing power even when it's not in use. He tested this theory by disabling Location Services and Background App Refresh for Facebook and claims he actually saw his battery percentage increase.

Step 29 of 36: Stop quitting; it won't extend the life of your battery

We tend to quit apps we aren’t using as it seems like a logical way to stop them sucking away at the battery. To quit an app, double tap the Home Button and swipe up to close.

Apparently, this isn't such a good idea after all. Apple Genius Loveless explains that when you close an app you take it out of RAM, this means that when you open it again the iPhone has to load it back into memory. "All of that loading and unloading puts more stress on your device than just leaving it alone," he writes.

Loveless adds that our fears that apps are draining battery life even when we aren't using them are unfounded, as they will only update in the background if they are set too in Background App Refresh.

"Unless you have enabled Background App Refresh, your apps are not allowed to run in the background unless they are playing music, using location services, recording audio, or the sneakiest of them all: checking for incoming VOIP calls, like Skype. All of these exceptions, besides the latter, will put an icon next to your battery icon to alert you it is running in the background," he explains.

Step 30 of 36: Show the battery percentage on your iPhone

If you want to keep an eye on your battery level, you may find it easier to see a percentage representation, rather than a bar icon. If you want to see how much charge you have left as a percentage, go to Settings > General > Usage and activate Battery Percentage. Now you will have a more precise read-out of what life your device has left.

Note that for reasons best known to Apple, the iPod touch lacks such an option. All devices, however, will warn when your battery life hits 20 per cent and then 10 per cent; also, be mindful that even if your battery has a few per cent left in it, your device might automatically shut down anyway, so don’t be doing anything too important when your iPhone, iPod touch or iPad is gasping for breath.

Apple genius Loveless does warn that some people become so concerned about their battery percentage that they keep turning on their iPhone to check it, and every time they wake up their phone a little bit of power dies.

Step 31 of 36: Calibrate to improve iPhone battery life

If despite trying all these tips to get more battery life out of your iPhone, you are still finding yourself running out of juice earlier than you think you should - perhaps your iPhone battery it going from 17% to 2% in a matter of minutes - your iPhone or iPad might need a battery calibration.

Apple recommends that you periodically drain your iPhone or iPad’s battery totally and then charge it up until it’s completely full. That's down to 0, and up to 100 per cent. You should do this at least once a month.

This process, called calibration, helps your device estimate its battery life more accurately. Calibrating your battery will ensure that you know when you need to charge the battery, but the procedure itself doesn’t actually make the battery itself last longer.

Step 32 of 36: How do you know how much battery you have left on your iPhone?

Frustratingly, there is no easy answer to this question. In iOS 8 Apple began to allow users to see which apps are the biggest battery drainers, plus Apple offers the ability to discover the percentage of battery power remaining, and you see how long your phone has been running without a charge, and how much of that time you have been using the iPhone, but if can't tell you how many hours you have left.

This is probably because the amount of battery life remaining is entirely dependent on what you are planning to do with your iPhone. If Apple told you to expect two hours and then you ran a movie on full blast you would probably run out of battery before the movie ended.

However, there are third party apps that can give you some guidance about how much battery life is remaining.

One such app is BatteryDoctor (previously BatterySaver) from KS Mobile. This tool offers a broad range of system tweaks, with a particular focus on saving battery life.

The app’s main screen shows an estimate for how much battery life is left, based on what’s running in the background, and your current system settings. If you perform some of the tweaks suggested by the app, you’ll see this number creep up.

For example, when we switched on Airplane Mode we gained about an hour of battery life - the battery life remaining changed from 8hrs, 17mins, to 9hs, 21mins.

Tap on Optimize to see a breakdown of how much longer your iPhone could last if you shut down certain services, such as disabling Wi-Fi or GPS, or reducing brightness.

Tap on Remaining for details of how much time you have remaining to do certain tasks, web browsing on Wi-Fi, or web browsing on 3G, talk time, video playback, photo taking, and more. 

The app BatteryDoctor will also alert you to any app being used, which might prove surprising, as in our case it highlighted Facebook which was open, as were many other apps, and yet Facebook appeared to be the only one consuming power in the background (despite the fact that we had turned off Location Services and background updates for that app).

Step 33 of 36: Should you leave your iPhone plugged in?

When you get to work do you plug in your iOS devices, so that they're nicely charged up by the time it's home time? In principle this should mean your iPhone (and iPad) always have enough power to get you through the commute home. But could this practice of leaving your iPhone plugged in all the time cause damage to the life of the battery?  

There is some debate about this - the iPhone is designed to stop charging its battery once the battery is fully charged, so this should mean that the battery can't be 'overcharged' as such. However, we know from our experience with laptops that have been left plugged in at all times, the ability of the battery to sustain a charge seems to deplete over time.

The best advice is to make sure that you drain your battery down to zero at least once a month if you want to ensure that you get a good life span out of your battery.

Step 34 of 36: Get a battery pack for your iPhone

Our final suggestion, if you still need more battery life, is to consider an external battery pack, or a case with one built in. There are many on the market that are worth considering, such as the Mophie Juice Pack Air (pictured) that can be used to keep the iPhone running for longer.

Read our round up of the best battery packs

Step 35 of 36: Save battery: turn your iPhone off

This one's a last resort, but if you need an iPhone to survive a weekend or a power outage, and its reason for being powered up is essential communications only, turn the device off when you’re not using it. First, that’ll stop you being tempted in just having another quick go on Candy Crush; secondly, it’ll also ensure even background tasks aren’t slowly supping power. To turn your iOS device off, hold the sleep button for a few seconds and then drag across 'slide to power off'.

Note that if you only have a few percent of battery left then your iPhone might not power on again if you turn it off, though. So switch to Airplane Mode in those circumstances.

Step 36 of 36: And finally…

We hope that some of these tips we’ve suggested mean you get more life from your iPhone when you’re away from your trusty Lightning or 30-pin charging cable.

The points we have covered are the main battery killers in iOS 8 and iOS 7. If it seems like we're switching off all the cool stuff, sorry about that, but to achieve optimal battery life you need to pick and choose which cool features you actually need, and which are draining your battery for superficial reasons, we're looking at you Facebook!

We have more iOS 8 tips here: iOS 8 beginners tips and iOS 8 advanced tips.

Plus read our iPhone reviews to find out why, despite battery wows we still think iPhones are the best phones on offer right now.

ALSO: In 2014 Apple recalled a number of iPhone 5 units, after it determined that some iPhone 5 batteries were faulty.

To find out if your iPhone was one of those recalled visit this page on Apple's website.

Plus: Will Apple replace my iPhone

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BarbaraRGordon said: Comments,BarbaraRGordon,Your first choice macworld < I'm making over $7k a month working part time. I kept hearing other people tell me how much money they can make away online so I decided to look into it. Welldone, it was a all true and has totally changed my life. This is what I do, > Find Here

AutumnJGonzalez said: Comments,AutumnJGonzalez,some time hit the macworld < I'm making over $7k a month working part time. I kept hearing other people tell me how much money they can make online so I decided to look into it. Well, it was all true and has totally changed my life. This is what I do, > Find Here

Withating1943 said: Comments,Withating1943,< ??????.+ zeldadungeon+ *********< now go with me >..... < Start working at home with Google! It’s by-far the best job I’ve had. Last Wednesday I got a brand new BMW since getting a check for $6474 this - 4 weeks past. I began this 8-months ago and immediately was bringing home at least $177 per hour. I work through this link,go? to tech tab for work detail,. > < Now Go R­e­­a­d M­o­r­e 15

Hamza said: Comments,Hamza,The best way is to turn the battery percentage off . Neither we see it nor we will worry about it

Rizzy said: Comments,Rizzy,Or you could just get yourself a BlackBerry passport. All day power and some. PassportSQW100-1/10.3.0.1418 FTW

baldy6211 said: Comments,baldy6211,Get a Blackberry z30 the battery last way into next day lols

SolielEtLaLune said: Comments,SolielEtLaLune,So in itherwords to save power on an iPhone is not to use one. Attention phone makers. Here is an idea. Make a bigger battery!!!! I'm sure an extra pound won't snap anyone's wrist

abcnewscensorscansuckit said: Comments,abcnewscensorscansuckit,Well, it will turn on again once it's charged up, no?

Nana said: Comments,Nana,In a nutshell, just don't use your iphone.

Jeffrey Leonhardt said: Comments,Jeffrey Leonhardt,I use the portable "Power Now" charger. It is small to carry and it can give my iphone 5s 1 full charge when my battery life gets low. I would rather use it than to have to go in and constantly turn things on and off. After all, why turn off so many convenient features? It sort of defeats the purpose.

Astro Boy said: Comments,Astro Boy,Thanx for the info, I hope this might also be useful for people who use too many apps http://iphoneipad.us

Ada said: Comments,Ada,I've had severe battery drain on my iphone4 after the update. I tried almost all do and don'ts but in vain. But this guide did some improvements for mehttp://howbees.com/2014/05/15/...

macworlduk said: Comments,macworlduk,Apart from when you have less than 5% because it won't turn on again!

valdi said: Comments,valdi,best way just turn iPhone off

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Play the retro 8-bit dating naked adventure game by The Uprising Creative

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