The Fenix ARB-L16-700UP 16340 lithium-ion battery is specifically designed for high current, high drain devices. The simple explanation of the benefits of this battery used in high drain devices is that they will last longer at their highest performing levels by sustaining a higher voltage. It also includes a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. This battery can quickly be charged without the need for a separate charger via its USB port. This not only saves you money from purchasing a charger, but also convenience of not having to carry around another device. A micro-USB charging cord is NOT included. Specifications of the ARB-L16-700UP Built-in USB Rechargeable Battery Size: 16340 Button Top Battery 700mAh Nominal Capacity 3.6V Nominal Voltage Max discharging current: 2.5A Charging current by USB port: 0.3A Charging current by separate charger: 700mA Heavy Load Discharge: 3.5C high rate discharge; 2.5A stable output Protection Circuit in the Anode to prevent short circuit Multiple layers of protection 500 charge cycles can be expected from a properly maintained battery Fully covered with a steel shell for impact resistance Over charge, discharge, short circuit, and over heating protection Three sets of over-head protection: Pressure relief valve protection, separate microporous protection, and PTC cathodal block protection Weight: 0.66 ounces (18.8g) Size: Length: 1.4" (35.5mm) Diameter: 0.7" (16.8mm) 12 months free warranty from date of purchase Indicator light on battery is red while charging, blue when charged