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Introduction |
If your laptop battery is a couple of years old and suspect the accuracy is incorrect, the battery can be recalibrated to correct the accuracy. | '''NOTE: Battery recalibration cannot be used to save a failing battery. While it will correct these packs to give you an idea how much life is left, capacity increases will not be appreciable. This also does not restore lost capacity; it will correct what is reported by the BMS.''' | | If your laptop battery is older and inaccurate or worn out, it may be possible to recalibrate it to correct incorrect reported capacities and potentially get a little extra life out of your old battery before you replace it. | | '''NOTE:''' Battery recalibration cannot be used to save a failing battery. It will correct the capacity of these packs, but it will not be appreciable. It also does not restore lost capacity from wear; this only corrects what the BMS reports. | | | ++ '''Guide notes''' ++ | * '''WARNING:''' If your battery exceeds 30-40 °C/86-104 °F, the battery should be treated as damaged and be replacedREPLACE THE BATTERY!''' | * '''UseIf your pack is old or worn out, use this procedure with caution on worn out. It may damage these batteries. If this damages if your battery be prepared to replace itis sufficiently worn out.''' | * If your laptop does not allow you to use it when the battery hits a certain percentage (notably HP), you will need to find a workaround to calibratedrain the battery correctlyto 0%. This will vary based on the BIOS type (UEFI or Legacy). | * In most cases, you will see aA capacity decrease is is more common (and good). This is good sincemeans the reported capacity and wear is now correctaccurate. | | * 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 require a workaroundautomatically turn off. UsePlug the laptop until the battery reachesin to wake it up and drain it to 0% and shuts off. Immediately charge the laptop untilonce it is fully chargedrunning again. '''Immediately recharge the battery'''.
***Lenovo laptops have a ~7% critical lockout, but it does not apply unless. This only kicks in if the laptop is shut down at that percentage levelturned off. |
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