My FW13 AMD (often) is drawing power from the internal battery while connected to mains via the original FW USB-C charger (60W). It mostly happens when opening e.g. heavy websites such as youtube, when the CPU is shortly bursting individual cores to boost frequencies. I have set the battery charge limit to 60% already, as the laptop is mainly connected the USB-C charger anyway.
I read that frequent smaller charging and discharging cycles (not full cycles) are not an issue for the internal battery (e.g. like enegery recuperation systems with EVs), but i wonder if this might by an issue for the embedded controller, perhaps weardown of the its flash memory or something? I had issues with older thinkpads thunderbolt controllers constantly wrting to internal flash memory, thus wearing out until complete controller failure.
This is with Linux 6.9 on NixOS, UEFI/BIOS 3.05 and power-profiles-daemon 0.21. It (of course) happens more frequently on the balanced and performance presets, but i can also trigger this with the power-saver preset.
I’m asking because i’m seeing lots and lots of charge requests on the EC’s console output…
FWIW, today i’ve received another, more powerful (20V/5A) USB-C charger in hopes of mitigating the issue, but so far without much success unfortunately.