Sabrent Extended Battery for GoPro HERO3+, HERO3 [with Backdoor Housings] (GP-KBH3) Get up to 5 hours of battery life with your GoPro Hero3 or Hero3+ using 1080p 30fps and up to 3.5 hours with 1080p 60fps Rated at 3.7V and 3400mAh for extended battery life; Premium Japanese cells for longer battery life Li-ion 3400mah Extended Battery Pack Backdoor Housings USB charging Cord