This 18650 rechargeable lithium-ion battery is a two-pack of high-quality, high-capacity 18650 rechargeable batteries (2200 mA, 3.7 volts) for flashlights, headlamps, and other devices. The protected-cell lithium-ion 18650 rechargeable battery (2200 mA, 3.7 volts) fits in any standard 18650 battery charger. This two-pack 18650 battery measures 18 mm by 65 mm and is rated at 3.7 volts (2200 mah). Note that this is a two-pack color, or brand may vary with availability, but high-quality quality will remain the same or better.