If the display shows "BAt" or "Err," the charger has determined the battery voltage is too low to recover (below 1.5V) or there is an internal short. You need a new battery.
If the engine does not start, wait for the charger to cool down before trying again. Failing to wait can melt internal components or trip your household circuit breaker. 🔍 Troubleshooting Common Issues
If your display shows a fault code, here is what they generally mean:
Use for a quick 10–20 minute charge to revive a deeply discharged battery.