According to YouTuber Dave2D who managed to get their hands on the Lenovo Legion Go S, the SteamOS version destroys Windows in performance and battery life.
So 7 hours on that battery would be approximately 5 hours on the deck.
I’ll download dead cells here to see how long the deck can run it in one charge, but I doubt it’ll reach anywhere close to five hours with the default settings.
According to a PC Gamer article, it has a 55.5 Wh battery. https://www.pcgamer.com/hardware/handheld-gaming-pcs/lenovo-legion-go-s-windows-review/ (This one is for the Windows version but the SteamOS version has (or may have) similar hardware.)
So 7 hours on that battery would be approximately 5 hours on the deck.
I’ll download dead cells here to see how long the deck can run it in one charge, but I doubt it’ll reach anywhere close to five hours with the default settings.
Edit: I was wrong. Got six hours out of it even.