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The Fenix ARB-L18-3500 is a high capacity 18650 Li-ion rechargeable with a protection circuit in the anode to help prevent short circuits, over charge/discharge and overheating. The battery also includes pressure relief

ARB-L18-3500U is a high capacity 18650 Li-ion USB rechargeable battery with a built-in micro-USB charging port. It also includes a protection circuit in the anode to help prevent short circuits, over charge/discharge

ARB-L21-5000 is a high-capacity 21700 Li-ion rechargeable battery use for more power and longer runtimes. Additional features include a protection circuit in the anode to help prevent short circuits, over charge/discharge and