The GoPro Accesory Enduro Dual Battery Charger + 2 Batteries has a capacity of 1720 mAh to extend your recording time. Designed for use at temperatures as low as -10°C, both batteries charge 13 degrees better than his standard GoPro battery and optimizes charging so you’ll get a fully charged battery as quickly as possible. The included dual battery charger can charge both at the same time and has a USB input port and the LED indicators show the charging status of both batteries.