I have seen pictures of people running car batteries, after relocating them up front. Running two batteries with an isolater would be a great set up but a little more difficult to do. This would keep your starting battery charged and run the extras from a deep cycle battery.
If you are trying to run a stereo and a couple of extra lights, get the biggest AGM battery that will fit in the stock location.
2005 650V2 LE
Black H1 plactic
kfx 700 clutch cover & clutch snorkle
Uni Air Filter
Purolator Pure One automotive oil filter (PL14610)
Herculiner Bedliner on racks and bumpers
Everstart AGM Battery Model ES20lbs 18Ah rating
2009 550H1 Camo
RoadRunner ETX18L 20Ahhr 340CCA (FleetFarm)
2004 Arctic Cat 50 Green
Lots of pink duck tape to girly it up for my Daughters