Most all Mechs will do what you need it to do, it's basically a tube that holds
batteries and the main thing you would want to worry about is the switch and the material the contacts are made out of.
Was looking up this mech called the Launcher V2 made by Raivapes. Copper contacts for superior conductivity and it's a clone too haha.
It's a great mod considering the
reviews. Go check it out!