It not just makes it difficult to gauge how much time you have left before needing to charge your device but can also lead to inconsistent performance leading to sudden shutdowns. Keep in mind that if the battery is actually bad, the above may not fix your issue.When the battery percentage of your device is stuck at 100%, it means that the system has failed to accurately track the battery level.
After that, unplug your AC adapter from both the laptop and the wall socket, shutdown the laptop, and leave both off/unplugged for a minute before restarting. The file itself is located in %WinDir%\System32\drivers\CmBatt.sys If the battery of your laptop is non-removable: Similarly to the above steps, uninstall the "Device Manager -> Batteries -> Microsoft ACPI-Compliant Control Method Battery Driver" and "Microsoft AC Adapter" (right-click -> uninstall). The "Microsoft ACPI Control Method Battery Driver" is a Windows service that should be set to start "On Demand" in "Services". Most common laptop PSUs should output about 19 volts, and there is a label on them that lists the input and output voltages.
Some power supply cables are prone to failure after repeat bending, and adapters can fail as well. Connect AC power, start laptop Notes: If following the above steps does not fix your issue, it may be worth using a voltmeter to verify the voltage coming out of the power supply at the point where it plugs into your laptop. Under "Batteries", right-click and uninstall "Microsoft ACPI Compliant Control Method Battery" (all occurances) and, optionally "Microsoft AC Adapter" 8. Open "Device Manager" (right-click on "Computer" -> Properties -> click "Device Manager" in left pane) 7. Follow the steps below to fix battery charging driver issues: 1. Below is a solution for resetting the Windows 7 default ACPI battery drivers. If the issue is persistent, it may be worth downloading newer drivers directly from your manufacturer. Battery Driver issues - the default Windows battery device drivers may be corrupt, or incompatible with your particular brand of laptop.
It may be worth cleaning the cooling ducts and CPU/GPU heatsinks with compressed air/vacuum. This can be remedied by turning off the laptop for a while to allow it to cool down. This issue can be caused by to distinct reasons: Heating issues - some laptops have built-in heat sensors that will stop charging if the battery, or the laptop itself gets hot.
This can lead to automatic hibernation of the laptop, immediate shutdown at power adapter disconnect, etc. When the issue occurs, with your AC charger plugged in you will notice that the battery is not charging, and hovering over the battery icon in the system tray shows "plugged in, not charging". It has become a common annoyance for some older laptops to suffer battery charging problems.
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