You’d think that the best way to keep your laptop’s battery from wearing out is to not use it. Right?
As it turns out, batteries are like muscles; they need to be worked out regularly to stay healthy. Ideally, you’d use your laptop unplugged at least once a day, like on a train or bus commute or on the couch in front of the TV.
If you’re not going to use it, constantly charging your battery is a bad idea; HP recommends on their website that if you’re going to leave your laptop plugged in or put up in storage for more than two weeks, you should take the battery out of your laptop.
How to recalibrate Laptop battery
First, charge your laptop’s battery to full, and leave it that way for at least two hours. Then unplug your laptop, and set its power management settings to never turn off or lower the monitor brightness. (HP has instructions for how do to this on Windows 7 and Vista, as well as Windows XP, while Apple has instructions for Mac laptops on their site.)
You want to drain the battery completely, then let your laptop sit for at least five hours this way like, say, overnight. (Just be careful and mute the volume, since some laptops make a warning sound when they’re about to run out.)
Afterwards, charge it up again, and you should notice a more accurate portrayal of your battery capacity. In some cases, you may even get more life out of it.