A reminder of Valve’s FAQ, given recent article on Websites trying to contradict (e.g. https://www.slashgear.com/1314340/steam-deck-plugged-in-overnight/):
If your device has been left on the charger for long periods of time, it may report less than 100% charge. This is normal. We allow the battery to slowly discharge after long periods of time under charge to optimize long-term battery health.
You must log in or register to comment.
I’ve had my deck since last April and it sits on my bedside table, plugged into the charge pretty much 24/7. Last time I had it off charge in the car (2 weeks ago) the battery behaved perfectly normal and gave me around 3 hours playing fallout NV. So I can confirm my deck is perfectly safe being left on charge.