Apple has reportedly engaged two suppliers to make thinner and lighter batteries for the iPad 3.

The Taiwan Economic News claims that Simplo Technology and Dynapack International Technology are the companies in question. Both currently supply Apple with batteries for iPads and MacBooks.

According to the report, production of the iPad 3 will begin in early 2012, and the device will have a thinner, lighter battery with a longer service life.

The batteries will be required to meet the CTIA IEE 1625 standard "for better quality and safety reliability", Taiwan Economic News said. However, the battery will cost 20 to 30 percent more than the current iPad batteries.

Suppliers for other components for the iPad 3 including the backlight modules and light bars have already been identified, according to reports from earlier in the summer, though it is thought that an insufficient supply of retina displays has put paid to any chance of the iPad 3 being launched before the end of the year.

Trial production of the iPad 3 could begin in October, according to other reports.