ASP Lithium-ion rechargeable batteries are custom-fabricated to provide increased energy density and longer life. The ASP 14500 rechargeable is optimized for use in high-drain devices such as performance flashlights. Each power cell has a PCM protection circuit to guard against excessive charge/discharge cycles. The ASP 14500 battery is designed exclusively for use with the ASP Guardian DF AA light. A Link carrier is included to store, protect and connect batteries.