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Changes to Recalibrating laptop batteries Introduction

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Introduction
and is beginning to fail or you suspect the reported information accuracy is incorrect, one thing you can do (outside of replacing the battery) is battery can be recalibrated to recalibrate correct the battery. accuracy. This process does is not restore lost capacity, a solution you can use to avoid replacing a battery that's beginning to wear out but is useful can be used to give you get an idea of how much life actually remains on is left. [ ] '''Note: This process does NOT restore lost capacity. It is meant to correct the battery. capacity reported to the BMS in your battery.''' [ ] ++ '''Guide notes''' ++ * It is very unlikely you will see a capacity increase through recalibration. It is far more likely '''WARNING: If your battery has unaccounted wear that was never logged and recalibration will simply force exceeds 30-40 °C/86-104 °F, the battery to take should be treated as damaged and be replaced!''' * '''Use this wear into account. procedure with caution on worn out batteries. This is NOT a bad thing. may result in battery damage; be prepared to replace the battery if this happens.''' * 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 calibrate the battery properly. The workaround for this correctly. This will vary based on what type of the BIOS is used (or in some (UEFI or Legacy). * In most cases, per series), so you will need to figure out what "works" for your specific laptop. * '''WARNING: If your laptop's see a battery gets hot to the touch and capacity decrease rather then an increase. This is beyond warm, measure the temperature of the battery. If the battery good, as unaccounted wear is running hot (~70-80 degrees Celsius), the battery should be considered damaged and be replaced!''' now known. * Once the battery is charging, it is best to let your laptop do it's thing and avoid using not use it. Using it is unlikely to harm anything, but this can This may affect the accuracy of the recalibration. * Batteries with a high wear percentage may be damaged by doing this. Be prepared to replace your battery if this happens. calibration accuracy. [ … ] To'''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%. Use **HP laptops have a ~15% BIOS lockout. For these laptops, a workaround is required.Use the laptop until the battery hits 0% and shuts off. Immediately charge the laptop until it is fully charged. charged. ***Lenovo laptops have a ~7% critical lockout, but it does not apply unless the laptop is shut down at that percentage level.
and is beginning to fail or you suspect the reported information accuracy is incorrect, one thing you can do (outside of replacing the battery) is battery can be recalibrated to recalibrate correct the battery. accuracy. This process does is not restore lost capacity, a solution you can use to avoid replacing a battery that's beginning to wear out but is useful can be used to give you get an idea of how much life actually remains on is left. [ ] '''Note: This process does NOT restore lost capacity. It is meant to correct the battery. capacity reported to the BMS in your battery.''' [ ] ++ '''Guide notes''' ++ * It is very unlikely you will see a capacity increase through recalibration. It is far more likely '''WARNING: If your battery has unaccounted wear that was never logged and recalibration will simply force exceeds 30-40 °C/86-104 °F, the battery to take should be treated as damaged and be replaced!''' * '''Use this wear into account. procedure with caution on worn out batteries. This is NOT a bad thing. may result in battery damage; be prepared to replace the battery if this happens.''' * 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 calibrate the battery properly. The workaround for this correctly. This will vary based on what type of the BIOS is used (or in some (UEFI or Legacy). * In most cases, per series), so you will need to figure out what "works" for your specific laptop. * '''WARNING: If your laptop's see a battery gets hot to the touch and capacity decrease rather then an increase. This is beyond warm, measure the temperature of the battery. If the battery good, as unaccounted wear is running hot (~70-80 degrees Celsius), the battery should be considered damaged and be replaced!''' now known. * Once the battery is charging, it is best to let your laptop do it's thing and avoid using not use it. Using it is unlikely to harm anything, but this can This may affect the accuracy of the recalibration. * Batteries with a high wear percentage may be damaged by doing this. Be prepared to replace your battery if this happens. calibration accuracy. [ … ] To'''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%. Use **HP laptops have a ~15% BIOS lockout. For these laptops, a workaround is required.Use the laptop until the battery hits 0% and shuts off. Immediately charge the laptop until it is fully charged. charged. ***Lenovo laptops have a ~7% critical lockout, but it does not apply unless the laptop is shut down at that percentage level.
Time Required Max
8 hours
12 hours

Tools

  • IR Thermometer x1 While not required, this can be used to verify the temperature of a hot running battery. (featured) added.
  • IR Thermometer x1 While not required, it is handy to diagnose "hot" batteries. (featured) removed.