All battery LEDs flash together, and the vacuum will not start, often after storage.

Safety first: Inspect the battery for swelling or damage before charging.

• 1. Attempt standard charge: Place the battery on the original Swan charger for at least 4 hours. Some packs will slowly recover enough to exit lockout.
• 2. Check charger LED behavior: If the charger LED remains off or flashes an error, the BMS may not allow charging.
• 3. Try a second charger (if available): Rule out a faulty charger.

If the battery remains in lockout and will not accept a charge, replace the Swan cordless vacuum battery pack. Do not attempt to bypass the BMS or use non-approved chargers.