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Based on a phone call to Hoover: If you want your battery to last and work properly do not store the battery on the charger or in the vacuum. Fully charge the battery and use it in the vacuum. If the battery runs out, fully charge it again (3 hours and a light on the charger will pulse when ready) and then store it separately. If the battery has not run out you can choose to recharge it so it fully loaded (again, take it off the charger when the light pulses) and then store it separately. Since a full charge only takes 3 hours an overnight charge is not recommended.