First Charge The Battery In Your Flash - Flash FLASHV1 User Manual

4. First charge the battery in your Flash

You must first connect the battery charger to a 110V
wall outlet and then to the charge port found on the
underside of your main tube of the bike. Remove the
rubber flap to insert the charger plug to the charge
port. The battery charger LED will indicate red when
the battery is charging. The TFT screen will indicate
when the battery is being charged. The battery is fully
charged when the LED light turns green on the battery
charger. To fully charge a battery typically takes 4-7
hours. Charge the bike until it turns green before your
first ride.
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It's easy: how to videos at http://support.flashbike.io