This Jupio bundle includes two Lithium-Ion Battery Packs for GoPro HERO4 and a dedicated USB Compact Dual Charger. The batteries are replacements for the original GoPro AHDBT-401 battery. They feature a 3.8V output and 1160mAh capacity. Designed with lithium-ion cells, they function memory-free throughout charge and discharge cycles. The compact charger has a micro-USB power port. A compatible USB cable is sold separately.