AHDBT-401 Battery ：High quality and advanced technology. And it's safe enough because of PCM Intelligent battery protection circuit.Adopting the SMT lead-free technology just accord with the idea of protecting the environment. Best Replacement for your Grpro 4 camera battery.Specifications:Battery Type: Li-ionCapacity: 1600mAh， 4.4WhVoltage: 3.8VColor: BlackFor Gopro AHDBT-401Use As a Spare or Replacement BatteryUSB Dual port Charger:Built-in Smart Fast Charging MCU ，Over-voltage Protection，Over-charging Protection ，Short-circuit Protection circuit. The Dual-charging-slot can are super fast to charge 2 gopro batteries so that keep enough power and energy for your GoproFeatures:- 100% brand new and high quality， Dual charging- Complete charging solution for Gopro Hero 4 battery- Perfect for both home and travel use- Compatible with original manufacturer equipments and chargers.- Quick charge with automatic constant current control prevents battery from overcharging， short circuit， and electronic shockSPEC:- Input:5V / 2A- Output: 4.35V 800mA ( x 2)- Charging for: AHDBT401Package contents:2 x Gopro hero 4 Battery1 x USB Dual port Charger