Powerextra 2 Pack High Capacity Replacement Batteries and Multi-functional Dual USB Charger for GoPro HERO4, AHDBT-401, AHBBP-401 Charge 2 GoPro HERO4 batteries at once; Batteries rated at 1500mAh high capacity Package includes 2 batteries and 1 dual USB charger to power your GoPro HERO4 and GoPro AHDBT-401, AHBBP-401 Superior quality cells have overcharge, over discharge, over voltage and short circuit protection for better battery life. No memory effect, batteries can be charged at anytime with no harm Powerextra products come with 30 days money back policy and 24 hours friendly customer service!