Skip to main content

Fix Your Stuff

Right to Repair

Store

Changes to Recalibrating laptop batteries Introduction

Edit by Nick

Edit approved by Nick

Before
After
Unchanged
Introduction
If your laptop battery is older and wish to extend it's life, it may be possible to recalibrate the battery. This can also be used to correct an inaccurate battery. [ … ] '''Important:''' '''Battery'''Battery recalibration will not save a worn out battery.''' batteries.''' The capacity reported by the BMS will be corrected, but it will not repair these batteries. Noticeable batteries are still worn out and will need to be replaced. '''Noticeable capacity improvements are generally short term. term and do not last'''. [ … ] === ++Guide notes++ === * '''''If your battery exceeds 30-40 °C/86-104 °F, REPLACE THE BATTERY!''''' * '''If your pack is older, use caution or consider discharging the battery to ~10%. A full discharge may damage older batteries.''' * '''In most cases, you will see a capacity decrease. This is good and means the information reported to the BMS is accurate.''' * '''Avoid using your laptop while it is charging. The calibration accuracy may be affected.''' * If your laptop does not allow you to use it when the battery drops to a certain percentage, you will need a workaround to drain the battery to 0%. This may vary 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. === ++Known BIOS lockouts++ === '''*HP laptops have a 15% BIOS lockout and will not turn on without being bypassed. Immediately recharge the battery once the laptop is at 0% capacity and shuts down.''' **Lenovo laptops have a ~7% critical lockout. '''This only becomes an issue if the laptop is turned off early.'''
If your laptop battery is older and wish to extend it's life, it may be possible to recalibrate the battery. This can also be used to correct an inaccurate battery. [ … ] '''Important:''' '''Battery'''Battery recalibration will not save a worn out battery.''' batteries.''' The capacity reported by the BMS will be corrected, but it will not repair these batteries. Noticeable batteries are still worn out and will need to be replaced. '''Noticeable capacity improvements are generally short term. term and do not last'''. [ … ] === ++Guide notes++ === * '''''If your battery exceeds 30-40 °C/86-104 °F, REPLACE THE BATTERY!''''' * '''If your pack is older, use caution or consider discharging the battery to ~10%. A full discharge may damage older batteries.''' * '''In most cases, you will see a capacity decrease. This is good and means the information reported to the BMS is accurate.''' * '''Avoid using your laptop while it is charging. The calibration accuracy may be affected.''' * If your laptop does not allow you to use it when the battery drops to a certain percentage, you will need a workaround to drain the battery to 0%. This may vary 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. === ++Known BIOS lockouts++ === '''*HP laptops have a 15% BIOS lockout and will not turn on without being bypassed. Immediately recharge the battery once the laptop is at 0% capacity and shuts down.''' **Lenovo laptops have a ~7% critical lockout. '''This only becomes an issue if the laptop is turned off early.'''