How to Fix an Acer Aspire Battery That Does Not Last Long

Acer Aspire laptops and netbooks use batteries based on lithium-ion cells. Li-Ion laptop batteries contain their own processors that calculate the remaining charge, which then gets reported to Windows and translated into the battery level you see. Under certain conditions, the battery can begin reporting incorrect values, which can cause it to stop charging prematurely or die without warning. This can be corrected through a process called "calibration," which fully discharges and then recharges the battery.
1.Shut down the Aspire.
2.Plug in the AC adapter.
3.Wait until the charging LED indicates that the battery is fully charged.
4.Start up the Apsire.
5.Uplug the AC adapter.
6.Click the battery icon in the system tray (near the clock) and select "More Power Options."
7.Click the radio button next to "High Performance" if it's not already filled.
8.Click "Change When the Computer Sleeps" in the left pane.
9.Use the drop-down list boxes to select "Never" for each item in the "On Battery" column. Click "Save Changes."
10.Click Start and type "cmd" without quotation marks.
11.Right-click "cmd.exe" in the search results and select "Run as Administrator."
12.Enter the following line at the command prompt and press "Enter:"powercfg.exe /hibernate off
13.Allow the Aspire's battery to completely drain.
14.Plug in the AC adapter and allow the battery to charge fully, completing the calibration.