Looking for a battery pack to charge the Deck on the Go? In this video, we test out 5 Portable Battery Banks on the new Valve Steam Deck from Anker, RavPower, Baseus, Blackweb and No Name COmpany on Amazon. Is A 20000 mAh Battery Pack Enough? The Steam deck has a 40Wh battery and can be charged at up to 40 Watts using a PD 3.0 Charger or external Battery back. Steam Deck Accessories