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The way to Recalibrate your laptop
battery for laptops using Microsoft Windows software
Recalibrating
the battery simply means recharging the battery to its maximum capacity and
resetting the battery gauge to display the level of charge accurately. You
may notice that the Windows system tray battery meter does
not correctly display the battery charge level when you install a new
battery, or when the notebook is not used for a long period of time. If the
battery gauge becomes inaccurate, you must recalibrate your battery.
Method 1: calibrate the battery
while PC is in use
Recalibrating
the battery requires a cycle of a complete charge and a complete discharge.
If the PC is being used during this calibration cycle, the power management
properties must be disabled to allow the battery to completely discharge.
To recalibrate the battery while using the PC, complete the following
steps.
1.
Connect
the AC adapter and allow the notebook to charge until the battery is
charged to 99% - 100% of capacity.
o
To
determine the percentage of battery power, with the notebook operating
normally, right-click on the power icon in the system tray, and
select Open power meter . The Power Status is displayed.
2.
When
the battery has charged to 99-100%, remove the AC power adapter cable from
the notebook PC. An overnight charge will charge your battery to 100%, even
if the battery meter indicates you have less than a 100% charge.
3.
Click Start
, click Control Panel , and click Category View .
4.
Click Power
Options , click Performance and Maintenance , then the Power
Options .
5.
On the
Power Schemes tab notice and record the default settings. You will
need to reset these values later.
Power
Options Properties Window
6.
Select
the Always On Power schemes value. Then select the Never
value for all topics in the Running on batteries column.
The
Always On settings prevent your notebook from entering Sleep mode
and allow the battery to drain faster.
7.
Click Apply
to accept the values and force the battery to consistently discharge. The
notebook is in constant operation during the test period.
8.
Allow
the battery to discharge completely until the notebook PC turns off.
The
battery is now calibrated and the battery level reading on the power meter is
now accurate.
9.
Plug
in the AC adapter and restart your notebook.
10. Return to the Power Options Properties dialog box (Step
5), and re-enter your power savings settings to the desired level.
Please
note you will need to charge and partially discharge your battery before
completely draining it otherwise you may kill your battery.
The
maximum capacity of the battery will decrease with time and use. Eventually
you will need to purchase another battery.
Calibrating the battery while PC
is not in use
Recalibrating
the battery requires a cycle of a complete charge and a complete discharge.
To recalibrate the battery while using the PC is not is use, complete the
following steps.
The
recalibration may take 1-5 hours depending on the age of the battery and
the configuration of the notebook PC you own. The PC should not be used
while you perform the following steps. Completing all the following steps
will also calibrate the battery so that the power meter readings are
accurate.
1.
Shut
down the notebook PC
2.
Connect
the AC Adapter to the notebook PC and to an electrical socket.
3.
Charge
the Notebook PC until the Battery Charge light is Green . This
indicates the battery is completely charged.
4.
Press
and release the Power
Button to start the computer.
5.
Press
the F8 key several times when the startup Logo or the laptop
manufacture name displays.
6.
When
the Windows Advanced Startup Menu displays, select the Startup in Safe
Mode option.
7.
Remove
the AC power adapter from the notebook PC.
8.
Allow
the battery to discharge completely until the notebook PC turns off.
9.
The
battery is now calibrated and the battery level reading on the power meter
is now accurate.
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