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Introduction |
If your laptop battery is older (and inaccurateyou wish to get a little more use out of it) or worn outhas an inaccurately reported capacity, it may be possible to recalibrate it to correct incorrect reported capacities and potentially get a little extra life out of your oldthe problem by recalibrating the battery before you replace it.
'''NOTE:''' Battery recalibration cannot be used towill not save a failingworn out battery. It will correct the capacity of these packs, but itany capacity improvements will not be appreciable. It also does not restore lost capacity from wear; thisThis procedure only corrects whatthe capacity reported to the BMS reports. | | | ++ '''Guide notes''' ++ | | * '''WARNING:''' If your battery exceeds 30-40 °C/86-104 °F, REPLACE THE BATTERY! | * '''If your pack is old or worn outolder, use this procedure with caution. ItThis procedure may damage these batteries if your battery is sufficientlya worn out battery.''' | * If your laptop does not allow you to use it when the battery hitsdrops to a certain percentage (notably HP), you will need to find a workaround to drain the battery to 0%. This will varyvaries based on the BIOS type (if your system uses a UEFI or Legacy) BIOS. | * AIn most cases, you will see s capacity decrease. This is is more common (good and good). This means the information reported capacity and wearto the BMS is now accurate. | | * Try to avoid using your laptop while it is charging. This may impact the calibration accuracy. | | | '''How to recalibrate the battery''' | | * Charge the laptop to 100%. | | * Use the laptop until it's at 0% and shuts down**/***. | | * Immediately recharge the battery. To recalibrate the battery, charge the battery to 100% (ideally uninterrupted). | | === Known BIOS lockouts === | | **HP laptops have a ~15% BIOS lockout and automatically turn off. Plug the laptop in to wake it up and drain it to 0% once it is running again. '''Immediately recharge the battery'''. | | ***Lenovo laptops have a ~7% critical lockout. This only kicks in if the laptop is turned off. |
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