Battery Charge Thresholds¶

Important

Battery charge thresholds, discharge and recalibration are currently only supported for IBM/Lenovo ThinkPads
Any other Lenovo laptop models including IdeaPads and all other laptop brands are not supported
TLP 1.3.1 does not support the kernel’s natacpi implementations for Asus and Huawei laptops because of differing sysfiles

START/STOP_CHARGE_THRESH_BATx¶

START_CHARGE_THRESH_BAT0=75
STOP_CHARGE_THRESH_BAT0=80

START_CHARGE_THRESH_BAT1=75
STOP_CHARGE_THRESH_BAT1=80

Set battery charge thresholds for main battery (BAT0) and auxiliary/Ultrabay battery (BAT1). Values are given as a percentage of the full capacity. A value of 0 is translated to the hardware defaults 96/100%.

Important

You must always specify both thresholds - start and stop - for a battery, otherwise TLP will ignore the setting completely (and silently).
To use only the start threshold set the stop threshold to 100%:
```
START_CHARGE_THRESH_BAT0=75
STOP_CHARGE_THRESH_BAT0=100
```

Note

Charging starts upon connecting AC power, but only if the charge level is below the start threshold (START_CHARGE_TRESH_BATx)
Charging stops when reaching the stop threshold (STOP_CHARGE_TRESH_BATx)
If, however you connect the AC adapter when the charge level is above the start threshold, then it will not charge

Hints:

Thresholds always go with a lower usable battery capacity, therefore the settings are disabled by default and must be enabled explicitly by removing the leading #
ThinkPad T420(s)/T520/W520/X220 (and all newer models): check Erratic Battery Behaviour
For further questions concerning charge thresholds please visit the FAQ: Battery Features

RESTORE_THRESHOLDS_ON_BAT¶

RESTORE_THRESHOLDS_ON_BAT=1

Restore configured charge thresholds when AC is unplugged:

0 – disable
1 – enable

Default when unconfigured: 0

Hint: after the commands tlp fullcharge/recalibrate the charge thresholds will stay at the hardware defaults 96/100% until the next reboot. Use this feature to restore them prematurely.

NATACPI/TPACPI/TPSMAPI_ENABLE¶

NATACPI_ENABLE=1
TPACPI_ENABLE=1
TPSMAPI_ENABLE=1

Control battery feature drivers:

0 – disable
1 – enable

Default when unconfigured: 1 (all)