LG Battery State Miscalculation / Low Charge Protection

Robot vacuum starts but immediately returns to the dock without cleaning, with no specific error code.

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Possible Causes

Battery not fully charged, Battery calibration drift, Weak battery unable to sustain load, Faulty battery voltage sensing circuit

How to Fix / Troubleshooting

Safety first: Ensure the dock is plugged into a stable power outlet.

  • 1. Full recharge: Leave the robot on the dock for at least 4–5 hours to ensure a complete charge.
  • 2. Battery reset: Perform a full discharge by running the robot until it stops, then fully recharge. This can recalibrate the battery gauge.
  • 3. Check battery age: If the battery is older than 2–3 years or runtime is short, replace it.
  • If the robot still aborts cleaning immediately with a new battery, the voltage sensing or power management circuit on the main PCB may be faulty.
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Repair Difficulty

Easy 2/5

Required Part

Lithium-Ion Battery Pack
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