Extended Battery Pack 4000mAh (Limefuel Epic L40GH) for GoPro HERO, External Mini USB Includes Extended Backdoor Housing up to 40 Meters, for entry-level camera only NOT COMPATIBLE with Hero 4, Hero 3/3+Patent
Sabrent Extended Battery Pack for GoPro HERO4, HERO3+, HERO3 [with Backdoor Housings for HERO4 only] (GP-KPHA) | GP-KPHA
Extended Battery Pack for GoPro HERO4, HERO3+, HERO3 [with Backdoor Housings for HERO4 only] (GP-KPHA) - Walmart.com
High Gear: Field-testing the Re-Fuel 6-hour Action Pack for GoPro Hero 4, 3+ and 3 | SummitDaily.com