As you know, the Steam Deck game console has good autonomy, but, unfortunately, this does not apply to demanding games, where the situation can be very deplorable. It turns out that there is a curious way to increase the battery life of the set-top box.
One of the owners of the console found that reducing the display frame rate from 60 to 40 Hz provides an increase in autonomy by 20-25%, which is quite a lot.
The catch is that now you can only do such a trick with Windows, that is, you have to abandon your native Steam OS. However, soon the developers promise to add this feature to Steam OS.