Sign In

**Possible causes**:
- Battery aging (especially lithium batteries that have been used for more than 2 years)
- Low temperature environment (it is normal for battery life to decrease by 20%-30% in winter)
- Frequent sudden acceleration/overload riding
- Incompatible charger or bad charging habits (such as often not fully charged)

**Possible causes**:
- Damaged charger
- Poor contact of the charging port (oxidation, dust blockage)
- Faulty battery protection board
- Charging environment temperature is too low

**Possible causes**:
- Bearing wear (common in high-mileage vehicles)
- Water ingress into the motor causes internal rust
- Gear or belt damage (some models)

**Possible causes**:
- Insufficient battery voltage
- Controller overheat protection
- Motor Hall sensor failure
- Poor line contact