Get more “juice” from your laptop battery

First, the basics

Most laptops use batteries that can last for 3-5 years, or about 1000  charges. (A premium laptop’s battery might last longer.) Every time you  charge your battery, the total capacity of the battery is diminished.  Originally it may have had a run time of 3.5 hours, but after a year  it’ll run out of juice at 3 hours, even on a full charge.

If your battery capacity has diminished, there are a few things you can  do about it. First, you have to correctly gauge how much capacity has  been lost. There are free downloads to do this job, like Battery Bar (for Windows PCs) or Coconut Battery (for Macs). These will compare your battery’s current maximum capacity to how long it lasted when it was new.
(UPDATE- we originally recommended Battery Eater and while the program works great, their download site has been compromised and we are recommending an alternate program, Battery Bar downloadable from CNET.)

Calibrating your Battery

You can’t miraculously reconstitute your battery’s capacity. It loses  power over time due to chemical reactions taking place in the battery,  as it chugs along powering your laptop. You can’t undo those changes,  but there is one common battery issue you can fix: In many laptops, the  operating system’s battery meter gets out of sync with how much juice  the battery actually has.

Imagine if the gas gauge on your car dashboard was misreading how much  gas you actually had in the tank. You’d either run out of gas when you  thought you had a quarter of a tank left, or you’d be filling up too  frequently. In your laptop, this can mean your laptop shuts down  abruptly when the meter says you have 30 minutes left. Or else the meter  might warn that you only have 2 minutes of battery life left and shut  your laptop down, when it really has another 20 minutes remaining.

Recalibrating gets the battery meter to correctly read the current state  of the battery, so you and the operating system know where you stand  with existing battery life.

How to recalibrate

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.

Best practices to maintain battery life

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.

Past the expiration date

So when is it time to throw out that old battery? The answer,  surprisingly, is “never.” Laptop batteries contain lots of toxic  chemicals, and should never end up in landfills. Fortunately, has a list of  environmentally responsible recyclers that will take your old battery  with no fuss.

When is it time to replace your battery, then? Use the free  utility apps Becky mentioned, and when they say that your battery can  only hold around 25% of its original capacity it’s probably time for a  new one. You can buy a replacement battery from the original laptop  manufacturer, and there are plenty of places online that sell discounted  PC laptop batteries, like Laptops  for Less and Owners of newer Mac laptops can get their laptop’s non-removable battery  swapped out at any Apple store, with a scheduled appointment.


5 thoughts on “Get more “juice” from your laptop battery

  1. For older version of laptops they usually last 5-6 years, for newer versions it is designed to last 3-5 years.
    There are generic laptop batteries that are designed for series of model like DELL, ACER, HP and etc.

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