Depends on the compression. If you are using the Custom 84mm JE's made for Tiger Racing and drop them in the hole about .010", Yes, you must have a 24V start system. If you use an off the shelf 84mm JE (which is the only piston comapny I use) then your normal high amp battery will work just fine.
If you need a 2nd battery tray, I have one for you here.
http://secure.mycart.net/catalog....vnext=1
Guy