Faulty charging indication.

I accidentally ran down the Li-Ion battery a while ago by leaving on 'play' for a few days. When I charged it up in the Camcorder it indicated full charge but when charger was disconnected it was only showing 50% on the info screen. I overcame this by leaving for a while, reconnecting the charger, and gradually repeating this process over a few weeks managed to get it to hold a full charge. After using it for about an hour or two the other day, and running down the battery, this problem has reappeared. Is there something in the charging circuitry which causes it to stop charging when it is only half or three-quarters charged or is it a fault or anomaly of the battery chemistry? Thanks in advance for any info. Mike.

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