Apple has just been awarded a patent for a curved battery and there is speculation that this could be very useful should Apple ever launch the rumoured iWatch.
Apple describes a way by which a curve is formed on a battery during the manufacturing process in the patent that is entitled: "Curved battery cells for portable electronic devices."
Mashable assumes that a curved battery would be unnecessary for a iPad or iPhone, and therefore hints that it may be used in a curved device, like a watch.
The patent was filed in January and is available in full here.
This isn't the first time we have heard suggestions that Apple may be working on curved and 'non-rectangular' batteries. In fact, we wrote about this patent in May. But Mashable is the first to suggest that it could be used for Apple's watch.