How about this
You can use a AA rechargable battery like I did.
All I did was weld the yellow wire to a AA box like thing and weld the glow plug wire to the box also. I just disconnect the glow plug connection when I don't need to heat the plug and connect them when I do.
You can add a switch to the wire instead and mount it where ever you need it. I just haven't gotten a switch.
I got pics if you want them.