b'Twin Cargo Bike R500E Notice D'utilisation page 15

Putting the battery into hibernation mode
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The battery may turn where stored for a long period (maximum 1 year) without charging
required and without alteration of the battery's capacities
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Press for 10 seconds on the button of the battery until the battery LEDs go out.
10''
The battery is now in hibernation mode.
Charge the battery with its charger at a power socket to awaken it.