Battery showing irregular lights
What battery LED colors and patterns mean — and when a fault means stop riding.
Symptoms
LEDs flash in an unusual pattern (not the normal charge display)
Purple/violet light, or red blinking/solid light
LEDs cycle through colors unexpectedly
Blinking yellow or amber LED during charging
What the lights mean
Normal operation shows green LEDs proportional to charge. Abnormal patterns indicate a BMS (Battery Management System) state:
Solid green bars — normal charge-level indication
Flashing / cycling colors — BMS in a diagnostic or fault state
Red or purple light — fault detected (cell imbalance, temperature, over/under-voltage)
No lights — fully depleted or in deep-discharge protection
Blinking yellow / amber during charging — slow-charge or cell-balancing mode (this is normal)
What to do
Note the exact pattern — how many lights, what color, solid or flashing, and the sequence. A video is ideal.
Power cycle the battery — disconnect from the board, wait 60 seconds, reconnect. A transient BMS fault may clear.
Check the data cable connection — a loose Fischer/ODU cable can cause BMS-to-eBox communication errors.
Try charging. If the fault clears and green indicators return, monitor the first few rides.
Do NOT ride with an active fault indicator. If an abnormal pattern persists after a power cycle and charge attempt, don't install the battery — contact support.
When to contact support
Have ready: your battery serial number, the exact LED pattern (video preferred), how long it's been stored, and any recent water/heat/impact exposure.