Hi Jay,
The RZR Dual Battery Kit can be used with Full Throttle Batteries or Odyssey Batteries. You will need the following batteries for a proper setup:
Full Throttle
FT560 - large battery to replace factory battery.
FT410 - 2nd / Aux battery that fits in smaller compartment.
Odyssey
PC1200 - large battery to replace factory battery.
PC925 - 2nd / Aux battery that fits in smaller compartment.
We always recommend using the same type batteries because charge rates are different for different batteries.
Both the Full Throttle and Odyssey batteries are AGM type batteries and work great. We have had great luck with the Full Throttle batteries lately.