Turns out you can download more battery as Valve's latest update for Steam Frame adds up to 12%

Valve has recently released an update for SteamOS on the Steam Frame, offering power efficiency enhancements and extending battery life during both streaming and local gameplay. The latest update boosts battery performance by up to 12%, a significant improvement considering the Steam Frame typically provides around two hours of streaming battery life. This means users can expect approximately an additional 15 minutes of streaming time from this single software update alone.

The update also introduces an accessibility option allowing users to limit eye tracking to a single eye, accessible through the VR Settings menu under General with the Track Dominant Eye Only feature (requires enabling Show Advanced Settings). Additionally, the update fixed an issue that prevented controller bindings from loading in certain games, such as Google Earth VR and Thumper.

Furthermore, the update improved focus behavior when interacting with grab/resize handles and provided further VR streaming reliability improvements, including additional fixes for Error 17. To benefit from these improvements, users must opt into SteamVR 2.18.2 or later on the PC, as it is currently available on the SteamVR [beta] branch. Valve also addressed connectivity issues with the Steam Frame wireless adapter, particularly affecting users in certain countries.

Beyond power efficiency, Valve recently enhanced charging capabilities for the Steam Frame, enabling fast charging even when the headset is turned off, significantly reducing charging times. SteamOS for the Steam Frame represents a new venture for Valve, building on its Arch-based Linux distribution used on the Steam Machine and Steam Deck, but tailored for virtual reality and Arm-based processors.

The update emphasizes the Qualcomm Snapdragon 8 Gen 3 processor in the Frame, hinting at potential future Arm-powered projects from Valve.