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Changes to Recalibrating laptop batteries Introduction

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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. [ … ] '''Read me:''''''''Important: Battery recalibration will not save old worn out batteries. batteries.''''' This will correct the reported capacity, but will not recover the pack. '''These batteries will not gain long-term capacity'''. '''''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 '''''If your pack is older, consider a discharge to ~10%. These may be damaged with a full discharge.''' discharge.''''' * '''In '''''In most cases, you will see a capacity decrease. This is good since the capacity reported by the BMS is accurate.''' accurate.''''' * '''Avoid '''''Avoid using your laptop while it is charging. This may affect calibration accuracy.''' 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 may vary 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 '''''HP laptops have a 15% BIOS lockout and will need to be bypassed to turn on. do a full discharge. Immediately charge the battery once the battery reaches 0% and the laptop shuts off.''' ** off.''''' * Lenovo laptops have a ~7% critical low capacity error (0190). '''This '''''This only comes up if the laptop is turned off before the battery reached 0% charge.''' and dies.'''''
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. [ … ] '''Read me:''''''''Important: Battery recalibration will not save old worn out batteries. batteries.''''' This will correct the reported capacity, but will not recover the pack. '''These batteries will not gain long-term capacity'''. '''''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 '''''If your pack is older, consider a discharge to ~10%. These may be damaged with a full discharge.''' discharge.''''' * '''In '''''In most cases, you will see a capacity decrease. This is good since the capacity reported by the BMS is accurate.''' accurate.''''' * '''Avoid '''''Avoid using your laptop while it is charging. This may affect calibration accuracy.''' 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 may vary 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 '''''HP laptops have a 15% BIOS lockout and will need to be bypassed to turn on. do a full discharge. Immediately charge the battery once the battery reaches 0% and the laptop shuts off.''' ** off.''''' * Lenovo laptops have a ~7% critical low capacity error (0190). '''This '''''This only comes up if the laptop is turned off before the battery reached 0% charge.''' and dies.'''''