Vacuum shows 'F5', battery indicator behaves erratically (jumping from full to empty)

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Faulty battery pack sense line, Damaged battery management IC, Loose connector between battery and PCB, Non-genuine battery without proper communication

How to Fix / Troubleshooting

Safety first: Remove the battery before inspection.

Clean and reseat battery: Wipe contacts and reinstall the battery firmly until it clicks.
Try another battery: If available, test with a genuine Black+Decker battery. If the gauge behaves normally, replace the original pack.
Reset electronics: With the battery removed, hold the trigger for 10–15 seconds, then reinstall the battery and test.
Service if persistent: If F5 appears with multiple batteries, the main PCB's sensing circuit is likely faulty and should be replaced.

Repair Difficulty

Medium 3/5

Required Part

Lithium-Ion Battery Pack / Main Control PCB

Check Price on Amazon

We may earn a commission from links on this page.