Standard USB ports on computers provide only 500mA. A USB power source
providing a minimum of 1.5A(amps) is required to charge the M300 while connected to
the Hot-Swap Battery.
Due to the architecture needed to support the Hot-Swap Batteries, the M300 will
continue to consume a small amount of power, even when powered off if the HotSwap
Battery and Main Units are connected. To prevent the batteries from
discharging when the device is not in use, disconnect either end of the Power Cable
connecting the Hot-Swap Battery and Main Unit.