| 摘要 |
The system has a portable bag (1) i.e. backpack, comprising a battery (4) to supply power to an electric motor of a light vehicle. A power control circuit controls operation of the motor and delivers a signal relative to the operation. A display (2) displays information relative to operation of the vehicle using the signal. A monitoring device (7) monitors a state of the battery, detects recharging phase of the battery and emits a recharge indicating signal. The display is fixed to the vehicle in a manually detachable manner and indicates the phase upon reception of the recharge signal.
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