Wasabi Power Extended Battery compatible with GoPro HERO4, HERO3+, HERO3 (with Backdoors) Replaces the Battery BacPac; Seamlessly attaches to the back of your camera to extend battery life Rated at 3.8V and 1260mAh for extended battery life; Premium Japanese cells for longer battery life with no memory effect Displays battery level or charging status on camera and battery Fully compatible with the HERO4, HERO3+ or HERO3 cameras and all accessories; Can be charged using any standard USB charger Includes extended battery, protective case, USB charging cable, and 4 backdoors (for Standard, Dive, Skeleton, HERO3, HERO3+ and HERO4 housings); All items include 3-year manufacturer warranty