Newmowa 2500mAh Power Battery Bacpac for Gopro Hero4,Hero3,Hero2 (Waterproof Backdoor Case and Standard Backdoor Case only for Gopro Hero4) Include:1 x extended battery, 1 x ventilated backdoor, 1 x waterproof backdoor, 1 x MINI USB cord. Camera is not included. Extended battery is rated at 3.8V and 2500mAh for a longer run time and can be charged using any standard USB charger. Battery is compatible with HERO4, HERO3 and HERO2 cameras. Both standard and waterproof backdoor cases are only compatible with HERO4. Seamlessly attaches to the back of your camera to extend battery life with no memory effect. Displays battery level or charging status on both camera and battery. Product get 2-year manufacturer warranty. You get prompt and friendly customer service.:)