Einhell 18V power xchange protean stock

Use an einhell 18v battery for your blaster, all you need are 2 15 by 30mm sheets of metal to fit securely on the contacts, brass is better because it is easy to solder on, but anything conductive should work, fit them on the center piece, solder your wires, put the top on with some 15mm wood screws and then clamp the center with the 2 sides, also use 15mm wood screws

make sure your motors can handle 18 to 20V, or use a voltage regulator in the middle,there is room for some electronics in the stock

fits an einhell battery