iFixit

With the simple press of a button, the back cover is free, allowing access to—what's this—a battery pull tab?

It's almost as if the folks at GoPro wanted you to be able to take the battery out of your HD Hero3. What a novel idea.

The Hero3's 3.7 V battery is rated at 1050 mAh/3.85 Wh, a 50 mAh decrease from previous models, presumably due to the device's smaller size.

As usual, caution labels on the back of the battery warn us not to store the battery in high temperatures, disassemble it, or dispose of it…with fire.

Thanks for the heads up, GoPro.