Had that exact issue with my first SteamDeck, I was able to RMA immediately. This was near launch which makes it understandable. But it’s disappointing to hear they’re still sending units out like this.

I bought my wife a refurbished 512GB unit as soon as I heard they were available. It was delivered about a week later on a Thursday and immediately, we noticed battery life was very poor compared to mine.

Desktop mode showed battery health at 17%, and so by that Saturday, it was packed up to be sent back. Ended up going with a new unit instead, so your story sounds a lot like ours, sadly.