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You can fully charge it again, just don't leave the battery on the charger once its fully charged.
Leaving it on the charger does not do any damage.Straight from the website FAQ. http://www.ioniceaugers.com/foundations/store/storepage.asp?page=FAQWhat if I leave my battery on the charger?Leaving the battery on the charger will not harm the battery because the charger is programed to shut off after the battery reaches a full charge.