Brunton All Day 2.0 Extended Battery Pack for GoPro Hero, Hero 3+, Hero 4 - ASD
Kastar 1-Pack Battery and LTD2 USB Charger Replacement for Gopro4 Hero4, AHDBT-401, AHBBP-401 Battery, Gopro HD HERO4 Black & Silver, HD Hero 4 Black & Silver Action Sport Camera - Walmart.com