Someone may forgot laptop charger connector for a long time (e.g. 9 hours or more) and when he used to notice that the battery life become less than the first. And then he want to make laptop battery operated previous efficiency. How?
Eh…
I am sorry to tell you that there’s usually no way to get them back to “as new” condition when that happens.
You know most laptop batteries will lose performance over time, or will not hold a full charge after a year or two, especially if they’ve been left plugged in to the charger long after they are fully charged.
Only remedy is to replace the battery with a new one. About how to replace a laptop battery, I’ve told you in How to Choose a Compatible Replacement Laptop Battery? Then remember to :
REMOVE THE BATTERY
REMOVE THE BATTERY
REMOVE THE BATTERY!!!
(Important things need to say three times) whenever you use your laptop direct from a mains socket.
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Professional Battery Blog 