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crwdns2944351:0crwdnd2944351:0Recalibrating laptop batteries - READ FOR HP MACHINEScrwdnd2944351:0crwdne2944351:0

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Introduction
If your laptop battery is inaccuratelyolder or reporting its capacity or is olderincorrectly, it may be possible to recalibrate the battery to extend its life,. This can correct the reported capacity or get a better idea ofextend the life left inof an old battery by correcting the pack you havegauge.

'''''IMPORTANT: Recalibration does not save worn out batteries - it ONLY corrects the capacity. There is no way to recover a worn out battery, but the situation can be temporarily improved.'''''
For help understanding what calibration is, why it’s important, and how to calibrate batteries in other types of devices, check out the [[Battery Calibration|Battery Calibration Wiki.]]
'''''Important: Battery recalibration does not save worn out batteries.''''' This will correct the reported capacity and may extend it’s runtime temporarily, but will not recover the pack.
=== ++Guide notes++ ===
* '''''If your battery exceeds 30-40 °C (86-104 °F), REPLACE THE BATTERY!'''''
* '''''If your battery is older, consider a ~10% discharge. These batteries may be damaged from a full discharge.'''''
* '''''In most cases, you will see a capacity decrease. This is good, not bad.'''''
* '''''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. '''''Workarounds for UEFI/Legacy BIOSes are provided.'''''
* '''''If the capacity is inconsistent, the battery should be replaced.'''''
* '''''You will likely see a capacity decrease. This is good - not bad.'''''
* '''''Try to avoid using your laptop while it is charging. This may affect calibration accuracy.'''''
* '''''Inconsistent reporting usually indicates an EOL battery. These are often uncorrectable.'''''
* '''''If your battery is older, consider a ~10% discharge. A full discharge may cause damage.'''''
* If your laptop does not allow you to fully discharge the battery, you will need a workaround. '''''Workarounds for UEFI/Legacy BIOSes are provided.'''''
=== ++How to recalibrate the battery++ ===
* Charge the laptop to 100%. Use it until it shuts down and no longer turns on.
* Charge the laptop to 100%.
* Use the laptop until it reports a 0% capacity and shuts down
** See '''''BIOS lockouts (known)''''' for HP and Lenovo laptops.
* Immediately recharge the battery to recalibrate. Do not use the laptop.
=== ++BIOS lockouts (known)++ ===
* '''''HP laptops have a 15% BIOS lockout and need to be bypassed''''' to do a full discharge. Immediately charge the battery once the laptop shuts off.
** '''''This always happens with HP laptops unless it is bypassed.'''''
* Some Lenovo laptops have a 7% critical capacity lockout (0190).
** '''''This only occurs if the laptop shuts off early.'''''
* Charge the laptop to 100%. Use it until it shuts down and no longer turns on.
** See '''''BIOS lockouts and known OEM quirks''''' for HP and Lenovo laptops.
* Immediately recharge the battery. Do not use the laptop if possible.
=== ++BIOS lockouts and known OEM quirks++ ===
* '''''(BIOS lockout) HP laptops have a 15% BIOS lockout and need to be bypassed for a full discharge.''''' Immediately charge the battery once the laptop shuts off.
** '''''All HP laptops/2010+ Compaq.'''''
* '''''(BIOS lockout)''''' Some Lenovo laptops have a 7% critical capacity lockout (0190).
** '''''Only occurs if the laptop shuts off early. Easily bypassed.'''''
* '''''(Known quirk) Dell batteries often hold incorrect data. This usually self corrects with a second calibration.'''''