The 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 over heating. The battery also includes pressure relief vents which expel waste gas.
The 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 and over heating. (Charging Current USB Port: 0.8A - Indicator light on battery is red while charging, blue when charged)
*A micro-USB charging cord is NOT included.
This will work in all of the current models that utilise a li-ion 18650 battery.
