Charging Thresholds

To extend the lifespan of your battery, you can define charging thresholds.

A ThinkPad battery can be set for maximum runtime (hours), or for maximum lifespan (years).

More info

Setting the Charging Thresholds

Source: Reddit

  • You can set the charging start threshold in (At what value or below should charging start):

    /sys/class/power_supply/BAT0/charge_start_threshold

  • You can set the charging stop threshold in (At what value charging should stop):

    /sys/class/power_supply/BAT0/charge_stop_threshold

  • I have set the start threshold at 75 and stop threshold at 80 on my laptop

Optimizing for runtime (hours)

Source: Lenovo

The normal default Lenovo Power Manager Battery Maintenance setting keeps the battery fully charged. The setting starts charging when the battery drops below 96%, and stops at 100%. The battery runtime depends on the Power Plan settings.

Optimizing for lifespan (years)

Source: Lenovo

For maximum lifespan when rarely using the battery, set Custom charge thresholds to start charging at 40% capacity and stop at 50%, and keep the ThinkPad cool. The thresholds can be adjusted in the Battery Maintenance settings of Lenovo Power Manager.

If the battery is used somewhat frequently, set the start threshold at around 85% and stop at 90%. This will still give a good lifespan benefit over keeping the battery charged to 100%.