The Apple Watch is meant to be charged overnight.

In fact, many of Apple's decisions were made so that the watch could last a full day.So it's not surprising that one of the big changes to this year's Apple Watch could be a much bigger battery.A photo purportedly of the battery component used in the 42mm version of the second-generation Watch leaked onto Chinese social media this weekend.

The biggest change is that the leaked photos indicate the Apple Watch 2 could have a 35% larger battery, at least in the larger version, according to MacRumors.

AppleWatch2 purported battery pack show an increased capacity.

From 0.94 Wh-246 mAh to 1.28 Wh-334 mAh Weibo — The Malignant @the malignant August 28, 2016The leaked photos show a 334 milliampere-hour mAh battery, which is about 35.7% larger than the 246 mAh battery currently used in the 42mm Apple Watch.

A 35% percent larger battery doesn't necessarily indicate 35% more battery life, but it does suggest that Apple is working to make its smartwatch last longer than a day.

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