[Power and Battery] Increase the lifespan of your battery... doesn't stop charging at 80%

[WatchMkr]

I think there are two parts to this feature:

1. Set the firmware to stop charging at 80% (is there a standard interface)
2. Don't display this option if the firmware can't support it

@jackpot51 @crawfxrd may need your guidance on setting this up.

[AAnzel]

Hello all! I am pasting the issue I created a few days ago according to @leviport 's instructions. I'm sorry for making a duplicate issue.

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I have a Lenovo Legion 5 Pro laptop (details shown below), but this issue is also applicable to Lenovo IdeaPad laptops, as can be seen on the following links:

1. https://wiki.archlinux.org/title/Laptop/Lenovo (section 2.1. Battery conservation mode)
2. https://bugs.kde.org/show_bug.cgi?id=441057
3. KDE's Implementation https://invent.kde.org/plasma/powerdevil/-/commit/53f688de8eff37a52efed55b52d9e51f5217a185

At the moment, I can enable the battery charge limit (60% maximum charge) using the following command: echo 1 > /sys/devices/pci0000:00/0000:00:14.3/PNP0C09:00/VPC2004:00/conservation_mode, but a connection with the battery applet's builtin functionality would be much appreciated.

Additional Info:

sudo dmidecode | grep -A3 '^System Information'

System Information
	Manufacturer: LENOVO
	Product Name: 82JQ
	Version: Legion 5 Pro 16ACH6H

sudo apt show cosmic-applets

Package: cosmic-applets
Version: 0.1.0~1739478579~24.04~e9848a2
Priority: optional
Section: admin
Maintainer: system76 <[email protected]>
Installed-Size: 74.1 MB
Provides: system76-power-applet-virtual
Depends: cosmic-icons, libc6 (>= 2.38), libdbus-1-3 (>= 1.9.14), libgcc-s1 (>= 4.2), libpulse0 (>= 0.99.4), libudev1 (>= 183), libxkbcommon0 (>= 0.5.0)
Recommends: pipewire-pulse
Homepage: https://github.com/pop-os/cosmic-applets
Download-Size: 14.0 MB
APT-Sources: http://apt.pop-os.org/release noble/main amd64 Packages
Description: Cosmic Applets

[taivlam]

I am also observing this in Pop!_OS 24.04 (Alpha 7) on the HP Dev One. In addition, the OS doesn't seem to remember the state of the toggle for this option after reboot.

[esuriddick]

I followed this for my laptop (ASUS TUF DASH F15) and it worked to set a stop charging battery threshold. From my understanding, this should work for all ASUS laptops: https://www.linuxuprising.com/2021/02/how-to-limit-battery-charging-set.html

The toggle does nothing as mentioned by other users.

[wash2]

I think I will close this issue for now, but work could be done on https://github.com/pop-os/system76-power to improve support. We can reopen this issue if it's better to track support here though.

[waburden]

As of today, August 1, 2025, this issue remains. The toggle (on) is not remembered on subsequent boots, plus the 80% maximum charge continues to be exceeded to 100%. (I just installed a new battery on my Dell Latitude E6330.)

[wash2]

What version of the applets do you have installed?

[nalladev]

As of today, August 1, 2025, this issue remains. The toggle (on) is not remembered on subsequent boots, plus the 80% maximum charge continues to be exceeded to 100%. (I just installed a new battery on my Dell Latitude E6330.)

Where can i find this toggle? Does this feature require installing an applet?

[craftyguy]

As far as I can tell, the toggle is removed/hidden if you don't have System76's power daemon thingy running: https://github.com/pop-os/cosmic-applets/blob/fddfc0b6844df7ae2ee9bdb81684e84b0478d5d6/cosmic-applet-battery/src/backend/mod.rs#L227

It would be nice if it supported PPD :)

[nalladev]

Is there like an alert system that can be set to custom low and high for non system76 laptop's where stopping charging might not be possible.