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
How to Fix AirPods not Working on Ubuntu - TechWiser
How to Fix AirPods not Working on Ubuntu - TechWiser
Pair Apple Airpods with Ubuntu/Linux on Thinkpad - Shubham Tatvamasi - Medium