How to enable battery charge limit on Linux

Some laptops allow you to set a limit on the battery charge level. This feature is known as a charge threshold. For instance, you can choose to stop charging the battery when it reaches 60%, which may help to prolong the battery's lifespan.

On my Lenovo Thinkbook 14s Yoga it's very easy to do this. Here are the steps:

sudo dnf install tlp tlp-rdw

sudo nano /etc/tlp.conf

add this line to the file:

STOP_CHARGE_THRESH_BAT0=1

save and close.

sudo systemctl enable tlp.service
sudo systemctl start tlp.service

Done! Now your laptop should stop charging the battery beyond 60%.

As you can see in the screenshot, the battery is charged until it reaches 59% and then stops charging above that limit.

To check if your laptop supports this feature run:
sudo tlp-stat -b

On my laptop the output is this:

$sudo tlp-stat -b
--- TLP 1.5.0 --------------------------------------------

+++ Battery Care
Plugin: lenovo
Supported features: charge threshold
Driver usage:
* vendor (ideapad_laptop) = active (charge threshold)
Parameter value range:
* STOP_CHARGE_THRESH_BAT0: 0(off), 1(on) -- battery conservation mode

/sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode = 1 (60%)

+++ Battery Status: BAT1
/sys/class/power_supply/BAT1/manufacturer                   = Celxpert
/sys/class/power_supply/BAT1/model_name                     = L19C4PDB
/sys/class/power_supply/BAT1/cycle_count                    =    316
/sys/class/power_supply/BAT1/energy_full_design             =  60000 [mWh]
/sys/class/power_supply/BAT1/energy_full                    =  52800 [mWh]
/sys/class/power_supply/BAT1/energy_now                     =  31380 [mWh]
/sys/class/power_supply/BAT1/power_now                      =      0 [mW]
/sys/class/power_supply/BAT1/status                         = Not charging

Charge                                                      =   59.4 [%]
Capacity                                                    =   88.0 [%]

This line:

Supported features: charge threshold

shows that my laptop supports charge threshold.

And this section gives me the line I need to add to /etc/tlp.conf:

Parameter value range:
* STOP_CHARGE_THRESH_BAT0: 0(off), 1(on) -- battery conservation mode

Comments

[vegapunk]

Worked for my perfectly! Thanks