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

Attempt normal charge: Place the battery on the OEM charger for several hours, even if LEDs do not light immediately.
Check charger LED: If the charger shows an error or no indication, test with another battery if possible.
If battery will not wake: The BMS may have permanently disabled the pack due to deep discharge. Replacement is required.
Storage tip: Store future batteries at 40–60% charge in a cool, dry place and recharge every few months.

Vacuum does not respond after long storage period

Possible Causes