Starter Box Gel Cells???

[PoPRC]

Ok, I need to get a 12V Gel Cell and charger for my Ofna True Start Universal Bump Box. A guy on another forum said I could get an Interstate 12V battery and a Battery tender Jr. Charger. What do you guys recommend? An does anyone know where I can get a wiring diagram for this thing? Also is the power panel necessary? Should I get one or no? I also have to leads Power(red) and Ground(black) coming out of the side of the box. What are these for? Charging the unit, the glow ignitor or what?

Thanks Guys