tech_ken parent
After about 2 years my battery also lost a lot of it's charge-retention, but I replaced it and got back up to the >11 hours I was seeing before
I'm planning to send it in to them this week for some repairs (USB-C port stopped working, replace the rubber feet, and replace the battery). I have to pay for the battery replacement (~$100 I think). Hopefully it improves the battery life. IIRC, I was getting 4-5 hours when I first got the machine. Never got anywhere close to 11. Maybe it's how I'm using it.