ASP USB rechargeable flashlights use 18650 Lithium-Ion batteries. These illumination tools are unique because their batteries may be recharged while in ASP lights. The ASP Charge Bank is compact and rugged. To recharge an ASP 18650 battery, insert the Charge Bank into a 12V vehicle outlet. The Charge Bank can also charge via its micro USB port from any wall or computer outlet. Once recharged, the battery can be inserted in any 18650 ASP flashlight. With a battery installed, the Charge Bank may also be used to recharge other electrical devices. The Charge Bank accepts an ASP 18650 battery (included). It provides visual indication of 25%, 50%, 75% or 100% charge. Pressing the gold activation button displays the battery capacity. The Charge Bank provides convenient charging, transport and storage of ASP 18650 batteries. The Charge Bank includes one 18650 battery and 18650 Link Storage Case. Product Features Length: 6.357" Diameter: 1.10" Weight: 3.12 ounces (with battery)