Battery will not charge; charger LED flashes or stays off, and the vacuum never gains charge.

Safety first: Unplug the charger from the mains before handling connectors. Do not attempt to jump‑start lithium‑ion batteries.

• Step 1 – Test outlet and charger: Verify the wall outlet works with another device. Inspect the charger for damage and ensure the LED illuminates when plugged in.
• Step 2 – Clean contacts: Clean the battery and charger contacts with a dry cloth or isopropyl alcohol. Ensure there is no debris preventing contact.
• Step 3 – Check for bent pins: Inspect the charger dock and battery for bent or recessed pins. If pins are damaged, replace the charger or battery as appropriate.
• Step 4 – Try another charger: If possible, test with a known‑good genuine Tower charger.
• Step 5 – Replace battery: If the charger is known good and the battery still will not charge, replace the Tower lithium‑ion battery pack.