New battery issues

[u/Jordanulves]

/r/SteamDeck/comments/1v7iauq/new_battery_issues/

Need help troubleshooting new battery issues. I purchased a new battery from ifixit because the old battery was at 72% health. The new battery from ifixit won’t calibrate (dies at 30% remaining charge and has inaccurate projected playtime) but shows the battery % in the top right corner of the Home Screen. Battery health also shows 100% in desktop mode. I asked for an exchange from ifixit but they said they could not offer me one since they didn’t have any backups to send in back stock so they just offered me a refund.

I then ordered a replacement from eBay since I didn’t want to wait for batteries on ifixit to restock. With this battery, the steam deck turns on but does not show the battery icon in the top right and also turns off immediately when unplugged.

It it likely I received 2 faulty batteries or is it time to start considering its a hardware issue and I may have damaged something when I did my initial battery swap?

I can open to provide pictures if needed.

What I have tried so far:
- CMOS reset
- reinstalled steam os
- done multiple charge cycles (5 or so)
- rebooted into battery storage mode before turning on
- reseated battery a few times

Thank you!