Battery Not Charging — Charger Shows Fully Charged Immediately

Your charger plugs in and immediately shows 4 green lights (fully charged), but the bike has no power or very short range. This usually means the battery cells have degraded and can no longer hold a charge.

How to Diagnose

1. Get a multimeter — any basic one works ($15–20 at hardware stores).
2. Set it to DC Voltage (the V with a straight line), 200V range.
3. Remove the battery from the bike and locate the main battery plug connector (the large connector on the bottom).
4. Insert the RED probe into the positive (+) terminal and the BLACK probe into the negative (-) terminal.
5. Read the voltage display.

What the Numbers Mean

Voltage Reading	What It Means
52–54.6V	Fully charged, healthy battery
48–52V	Partially charged, healthy
42–48V	Low charge — charge immediately and retest
Below 40V	Battery cells are damaged — replacement needed
0V	Internal fuse blown or BMS failure — contact support

Prevention

Important: Always store your battery above 20% charge. Letting a lithium-ion battery drain to 0% can permanently damage cells. During winter storage, charge the battery to 60–80% and top it up every 30 days.