The surefire high-performance 3.6v 18650 lithium ion rechargeable battery with micro-usb port for ease of charging no charging cradle needed.When plugged into a power source, two led indicators display the current charge state: red for charging and green for fully charged.8-10a discharge rate for dependability in high drain devices such as led flashlights.

Rechargeable: Yes
Nominal Voltage: 3.6 volts
Rated Capacity Mah: 3.5
Charge Time: 5-8 hrs
Chemical Composition: Lithium