Cordless vacuum displays E13 and the LED battery gauge behaves erratically (jumping from full to empty)

Safety first: Remove the battery before cleaning contacts.

• Clean contacts: Wipe the battery and handle contacts with a dry, lint-free cloth. Ensure there is no corrosion or debris.
• Full discharge and recharge: Use the vacuum until it stops on its own, then fully recharge it without interruption. This can sometimes recalibrate the fuel gauge.
• Avoid partial top-ups: For a few cycles, try to run the battery down to around 20–30% before recharging to help the gauge learn the capacity.
• Persistent erratic readings: If the gauge remains inaccurate or E13 persists, the battery pack's gauge circuit is likely faulty. Replace the battery pack.