Steam deck battery is held with adhesive unfortunately. And replacing it is difficult according to ifixit https://www.ifixit.com/Guide/Steam+Deck+Battery+Replacement/149070
I hope with this legislation it will be easier to replace.
That sucks. I replaced the batteries in my two Razer laptops recently (my 2016 was getting bloated and my 2021 battery randomly stopped charging…) and I will say it was easy enough to replace as the battery packs were held in with screws, not tape. Unscrew the screws holding the battery frame into the laptop, remove battery, insert new one, screw it down, put bottom panel back on. I don’t mind screws, just no glue or tape please. Glue and tape suck for repairability.