Bafang · Battery
43 Bafang error code 43
Total power from battery cells too high
Per manufacturer documentation
Note
Meaning may depend on model, display and firmware – verify with the manual of the exact type.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Aged cells, increased internal resistance
- Weak or discharged cell group
- Contact fault at battery connector/mount
- BMS protection or BMS fault
Safe test steps
- Resting voltage at the pack output vs. the nominal class (S × 3.6 V nominal, S × 4.20 V full for Li-ion).
- Load test with current: R = ΔU / I (E-Bike Doctor battery calculator).
- Condition of mount contacts, discoloration, play.
Workshop reference values
- Li-ion cell: 3.6–3.7 V nominal, 4.20 V full; manufacturer minimum typically 2.5–3.0 V (per datasheet).
- Pack full voltage (Li-ion): 7S 29.4 V · 10S 42.0 V · 13S 54.6 V · 14S 58.8 V.
Repair approach
- Full charge with the original charger, then re-measure.
- Pack repair/re-celling only by a qualified battery shop with identical matched cells; otherwise replace the pack.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Fused load tester or clamp meter
- Manufacturer dealer diagnostic tool/software (if available)
Safety
- Do not charge or open a swollen, hot, damaged, hissing or smelling pack – isolate it safely.
- Never connect an ammeter directly across the battery. Never bypass the BMS.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.