The following troubleshooting steps are ordered from "simple to complex, external to internal", and can be directly used for customer self-inspection, after-sales documents, or independent website FAQs, suitable for cross-border scenarios.

1. Power & Charger Connection Check

• Operation & Judgment:
  1. First, verify if the charging socket is energized (test with a phone charger or other devices);
  2. Check if the charger plug (to socket) and charger output (to battery port) are fully inserted (no looseness or poor contact);
  3. Observe the charger indicator: If the indicator doesn’t light up at all, the charger or power supply is likely faulty.

• Common Causes & Solutions:

  Causes: Power socket outage, loose plugs, broken charger power cord;
  Solutions: Replace with a powered socket, reinsert all plugs firmly, replace with a functional charger.

2. Charger Function Test

• Operation & Judgment:
  1. Replace with a same-model "known good" charger for testing: If charging works normally after replacement, the original charger is damaged;
  2. If charging still fails with the replacement charger, rule out charger issues and check the battery or vehicle charging port instead.

• Common Causes & Solutions:

  Causes: Faulty internal circuit board of the charger, abnormal output voltage/current;
  Solutions: Replace with an original or 3C-certified charger that fully matches the battery specifications (voltage V/current A).

  
  

3. Battery Appearance & Status Check

• Operation & Judgment:
  1. Check the battery case: Look for cracks, leakage, or swelling (swelling = severe battery aging, prohibit further use);
  2. For removable batteries: Remove and check if the electrode plates are oxidized (rust or white residue);
  3. Confirm "deep discharge": If the battery has been dead for more than 7 days without charging, it may enter a hibernation state.

• Common Causes & Solutions:

  Causes: Battery aging, electrode oxidation, hibernation due to deep discharge;
  Solutions: Wipe oxidized electrodes clean with a dry cloth; try "low-current slow charging" to activate deeply discharged batteries; immediately replace swollen/leaking batteries.

  
  

4. Charging Port & Wire Check

• Operation & Judgment:
  1. Check the charging port (vehicle or battery side): Look for foreign objects like dust or metal shavings inside, and clean gently with a dry cotton swab;
  2. Check wires and connections: First disconnect the charger power (to avoid short circuit), then check if the port wires are loose and if the wire insulation is damaged.

• Common Causes & Solutions:

  Causes: Blockage of foreign objects in the port, loose connections, wire short circuit;
  Solutions: Clean foreign objects, re-fix loose connections; damaged wires need to be soldered or replaced by professionals.

  
  

5. Battery & Vehicle Compatibility Check

• Operation & Judgment:
  1. Verify charger specifications: The charger’s voltage (V) and current (A) must exactly match the battery (e.g., a 60V charger cannot be used for a 48V battery);
  2. Confirm battery-vehicle compatibility: Some older vehicle models may not support new high-capacity batteries; check the vehicle manual for compatible battery models.

• Common Causes & Solutions:

  Causes: Mismatched charger and battery specifications, incompatible battery and vehicle models;
  Solutions: Replace with a charger that matches the battery specifications; select battery models compatible with the vehicle as marked in the vehicle manual.

6. Internal Fault Check (Professional Only)

• Operation & Judgment:
  If no abnormalities are found after the above 5 checks, the issue may be a faulty Battery Management System (BMS), damaged battery cells, or a faulty vehicle charging circuit. Disassembly and testing are required, and non-professionals are prohibited from operating on their own.

• Common Causes & Solutions:

  Causes: BMS protection lock-up, battery cell degradation, faulty vehicle charging module;
  Solutions: Contact brand after-sales service or professional maintenance personnel for inspection; replace the BMS or the entire battery pack if necessary.

  
  

Key Safety Tips

1. Do Not Operate: Never charge swollen or leaking batteries to avoid fire or corrosion.
2. Power-Off Check: Always disconnect the charger power before checking the charging port or wires to prevent electric shock.
3. Original Priority: When replacing chargers or batteries, prioritize original or national 3C-certified products