Cell Imbalance
Cell voltage delta (B field) exceeds threshold (typically >100mV)
What it means
Cell voltage delta (B field) exceeds threshold (typically >100mV)
Warning — Monitor the situation, may self-resolve.
Likely causes
- One or more cells degrading faster
- BMS balancing not completing
- Long period without full charge
What to do
- 1Perform full 100% charge to allow balancing
- 2Monitor B field over several charge cycles
- 3If B >150mV persists, dealer inspection
Which bikes use this table
Recorded in the binary log rather than shown on the dash — every generation writes them.
Related codes
Other log file Battery/BMS codes:
Dashboard codes for the same subsystem:
Questions
What does "Cell Imbalance" mean in a Zero log?
Cell voltage delta (B field) exceeds threshold (typically >100mV). It is written by the BMS. It is classed as warning: monitor the situation, may self-resolve.
What should I do about it?
Perform full 100% charge to allow balancing. Monitor B field over several charge cycles. If B >150mV persists, dealer inspection.
See when this actually happened on your bike
A dash code tells you the fault; the log tells you the pack temperature, the state of charge and the ten minutes leading up to it.
Sources:
Community reference: ZeroManual wiki entry
The code and its name are transcribed from Zero's own owner manuals; the severity, category and troubleshooting notes are ours. For official diagnostics, consult an authorized Zero Motorcycles dealer.