Valve launched Steam OS 3.7.8 with many new features, including the new version of Plasma, 6.2.5, and the load limit To extend the lifespan of the Steam Deck's battery. Battery theory says this: to maintain a longer lifespan, you should keep it between 20% and 80%, but above all, you should avoid leaving it drained or plugged in and charging for long periods of time. That's why a feature like this is important.
The Steam Deck is a handheld computer that can be used to play games, and among other things we can use it connected to a dock. For example, I use it connected to the TV when the game doesn't require much precision, since my third-party controller is very bad. In my case, it spends almost all the time connected, and even the arrival Since SteamOS 3.7.8, I used to occasionally unplug it to allow it to perform full cycles. That's no longer necessary, and neither is it on Windows.
The upload limit is applied from the BIOS firmware.
There are at least two ways to apply the upload limit: at the operating system level and at the firmware level. The former doesn't make much sense, especially on a Steam Deck that uses at least desktop and game modes. The most common way to apply it is to use the following methods: at the BIOS firmware level, and what it does is “tell” you here that 100% charge is actually 80%.
Although it can't be adjusted from the BIOS itself, the limit is applied there, so it will be in effect on any system using the deck. In my case, SteamOS in game mode, in desktop mode, Windows, and also Batocera. Therefore, applying this setting will protect the battery regardless of the system we use, so we can forget about overcharging it.