Different batteries usage in both AirPods when they're connected to a non Apple device (Lenovo T470 - Ubuntu 18.04) and then switch to iPhone 11 Pro. Haven't noticed if I use APP
sound - Pairing Apple Airpods as Headset - Ask Ubuntu
Pair AirPods with Linux Ubuntu - cri.dev
How to Fix AirPods not Working on Ubuntu - TechWiser
sound - Pairing Apple AirPods Pro as headset on Ubuntu 20.04 - Ask Ubuntu