They are delivered with one 12v "deep but not so deep cycle" battery. There is enough room for a second 12v deep cycle battery in the battery tray. You can if you wish, replace the original 12v battery with two 6v "really honest deep cycle " batteries wired in series meaning plus to neg. giving the 12 volts you need. Unless you plan on doing a lot of boondocking off the grid, it is not , in my not so humble opinion, worth adding a second battery or converting to two 6v's.
Making a smooth transition to senility for over 70 years
2017 Freedom Elite 29fe
2015 Jeep Wrangler Toad