Windows 7 has added a lot of new features, some of them you can see, but some you can’t even see it. Here is one small trick you can do with your Windows 7 laptop. (assuming that you have your battery plugged in)
We all know that over time, your lithium ion battery will not charge to its full potential as when it’s new. But how much less is the battery charging ?
Well in Windows 7 you can find out how much battery you are actually getting from your 3-cell or 6-cell or even 9-cell battery. Not the number says on the back of the battery, but the real number from the it.
You can use the powercfg -energy to find out how health your battery is.
Start by going to your Command Prompt, type "cmd" in your start menu.
and now just wait for 1 min and Windows will collect all the data and monitor your system
after it’s done, you should now see something like this.
Notice that it generate an energy report in HTML format (by default) to the following directory.
Go to the directory and open up the file. Skip everything and scroll down to the bottom of the report. You should now see something that tells your
some where along the line you should see this. So what does that mean ?
Well it tells you the battery type, and what’s the full capacity and most importantly the last full charge this is the number that your battery can MAX hold.
So here in my case, I got this acer laptop aspire 5580 and its about 2 and half years old. Never replaced the battery and its only charging to about 55% of the original capacity.
Last full charge : 24365 / 44400 ~ 55%
So if you are wondering how come my battery doesn’t last for long, well you got the answer from there. For me the battery that I have right now can probably give me around 1 hr usage on a balanced mode, around 1:20-1:30 in a power saving mode .