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Introduction |
| If your laptop battery is inaccurately reporting its capacity or it is older, it may be possible to recalibrate the battery to extend its life. | | | For help understanding what calibration is, why it’s important, and how to calibrate batteries in other types of devices, check out the [https://www.ifixit.com/Wiki/Battery_Calibration|Battery Calibration Wiki.] | | | '''''Important: Battery recalibration will not save old worn out batteries.''''' This will correct the reported capacity, but will not recover the pack. '''''If there are any improvements, these capacity bumps are typically short-term.''''' | | | === ++Guide notes++ === | | * '''''If your battery exceeds 30-40 °C (86-104 °F), REPLACE THE BATTERY!''''' | | * '''''If your pack is older, consider a discharge to ~10%. These may be damaged with a full discharge.''''' | | * '''''In most cases, you will see a capacity decrease. This is good since the capacity reported by the BMS is accurate.''''' | | * '''''Avoid using your laptop while it is charging. This may affect calibration accuracy.''''' | | * If your laptop does not allow you to use it when the battery drops to a certain percentage, you will need to use a workaround. This varies based on the BIOS type (UEFI or Legacy). | | | === ++How to recalibrate the battery++ === | | * Charge the laptop to 100%. | | * Use the laptop until it reports a 0% capacity and shuts down*/**. | | * Immediately recharge the battery to start recalibration. Do not use the laptop. | | === ++BIOS lockouts (known)++ === | | * '''''HP laptops have a 15% BIOS lockout and will need to be bypassed to do a full discharge. Immediately charge the battery once the battery reaches 0% and the laptop shuts off.''''' | | * Lenovo laptops have a ~7% critical low capacity error (0190). '''''This only comes up if the laptop is turned off before the battery reached 0% and dies.''''' |
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