This was intended to attach to the back of the Steam Deck and power it. Only after I assembled everything did I find out that the module only supports Power Delivery up to 9V. Since Steam Deck only uses 15V PD, this won't maintain charge during use. Though, this might still be useful with 5V only or with other devices that uses the DeckMate and 9V PD.

Hardwares

• DeckMate mechanism (the 3 holes in this model is sized for M3 bolts, so M2.5 bolts the mechanism was designed for will simply fit more loosely)
• 4 M3x20mm bolts
• 4 M3 nuts (alternatively, ~4.2mm heatset inserts can be used on the inside, and in which case, shorter bolts can be also be used)
• 4 18650 batteries with flat terminals
• Nickel strips (for spot welding) and wires
• 22.5W module as pictured