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I have read about this and one battery expert says to rejuvenate take another battery of same voltage that is charged completely . The reason they fail is you have multiple cells in series and 1 or more cells are not completely charging. His suggestion is to take another battery of same voltage that is fully charged verified by your volt meter. and connect in same polarity for 15 minutes only. The old battery will get hot . No more than 15 minutes. Then put it back on normal charger. You may have to do this 3 or 4 times. The theory is as has been stated chargers are built to charge to certain level no more. A word of caution lithium battery's are dangerous .