Joe Rossignol writing for Macrumors:

A purported photo of a larger 334 mAh lithium-ion battery destined for the Apple Watch 2 has surfaced on Chinese microblogging service Weibo, foreshadowing expected battery life improvements coming to the wrist-worn device.

The battery is allegedly for the 42mm model, which currently has a 246 mAh battery, suggesting the next-generation 42mm model could have a 35.7% larger battery. The photo does not provide any clues about potential battery life improvements coming to the smaller 38mm model, which is currently equipped with a 205 mAh battery.

I’m most curious about any design changes. Obviously the screen will remain more or less squarish, but will the addition of GPS and various other new sensors allow for it to be thinner? I just hope the bands will be interchangeable with the original Apple Watch.