Power up the most demanding flashlight systems with this rechargeable StreamlightA(R) SL-B50A(R) Lithium Ion USB-C Battery. Compatible with ProTac 2.0, ProTac 2.0 Headlamp, ProTac 2.0 Rail Mount 6 hour charge time USB-C charging port, no charger cradle needed 3.6V / 4900mAh delivers extended runtime LED power status indicators Integrated safety circuit protects batteries from overcharge/discharge Rechargeable at least 500 times