Recalibrate HP presario cq40 laptop battery instructions
My battery is not charging my new laptop battery to 100%. What is wrong with my laptop battery?
Sometimes when a new notebook battery is installed, the laptop and operating system software are unable to correctly measure the energy stored in the new battery. If after charging your new battery overnight your battery meter displays that you have only a partial charge on your battery, it is a good indication that the battery meter needs to be recalibrated. Your battery most likely has a full 100% charge after a full night of recharging, but your notebook battery power gauge is giving you a false reading. The following steps can be followed to recalibrate your battery meter:How 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 gauge does not correctly display the battery charge level when you install a new HP presario cq40 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: Calibrating the battery while laptop computer 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.
-
Connect the AC adapter and allow the notebook to charge until the battery is charged to 99% – 100% of capacity.
-
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.
-
-
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 HP Presario CQ70 Battery meter indicates you have less than a 100% charge.
-
Click Start , click Control Panel , and click Category View .
-
Click Power Options , click Performance and Maintenance , then the Power Options .
-
On the Power Schemes tab notice and record the default settings. You will need to reset these values later.Figure 1: Power Options Properties Window
-
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.
-
Click Apply to accept the values and force the battery to consistently discharge. The notebook is in constant operation during the test period.
-
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.
-
Plug in the AC adapter and restart your notebook.
-
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 battery.
The maximum capacity of the battery will decrease with time and use. Eventually you will need to purchase another battery.
Method 2: 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 HP Hstnn-db42 Battery so that the power meter readings are accurate.
-
Shut down the notebook PC
-
Connect the AC Adapter to the notebook PC and to an electrical socket.
-
Charge the Notebook PC until the Battery Charge light is Green . This indicates the battery is completely charged.
-
Press and release the Power Button to start the computer.
-
Press the F8 key several times when the startup Logo or the laptop manufacture name displays.
-
When the Windows Advanced Startup Menu displays, select the Startup in Safe Mode option.
-
Remove the AC power adapter from the notebook PC.
-
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.
