Features and Specifications: Rechargeable Li-ion battery, no memory effect Built-in protection circuit, highly safe High efficiency, long life battery cell Light weight and compact design Capacity: 1600mAh Voltage: 3.8V Battery type: Li-ion  Compatible with: GoPro HERO4 Package included: 1600mAh Replacement Rechargeable Li-ion Battery Pack for GoPro Hero 4 AHDBT-401