Turns out you can download more battery as Valve’s latest update for Steam Frame adds up to 12%
Valve has released the SteamOS 0.4.3 beta update for Steam Deck, bringing power efficiency improvements that can extend battery life by up to 12%. The gains vary depending on framerate and content, applying to both streaming and local gameplay sessions.
The update also adds accessibility features for eye tracking, including a new “Track Dominant Eye Only” option available in VR Settings under General settings (requires enabling advanced settings). Additionally, the patch improves streaming reliability and addresses controller-related issues, though full details of some fixes remain unclear due to incomplete documentation.