The Steam Deck rules, but anyone who’s spent time with Valve’s handheld gaming PC knows the battery can drain in just a couple hours when playing graphically intensive games. Luckily, there are third-party devices out there like the Baseus portable charger that can extend your playtime. Usually, the USB power bank costs $100, but you can grab it for just $56 at Amazon right now.
The Baseus Portable Charger features a 30,000mAh power bank and 65W battery, which can add several more hours of battery life to your devices. To charge your Steam Deck while playing, you need a 45W battery pack (at minimum), so this particular charger has no problem with that.
Source: Gamespot This Steeply Discounted Battery Pack Charges Your Steam Deck While You Play