A lot of rechargeable batteries build up a memory. Especially when you charge them off and on and they are not completely dead when you do. There is a little trick us computer salesman have learned. And that is to charge the battery up. Run the notebook until it is completely dead. Then charge it up again. Do this process 3 times. If your battery has a built up memory cycle of what it thinks is fully charged this should erase it.
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