The challenger 5er that I just purchased has a sign by the slide switch that indicates that batteries are required to operate the slide and should not use shore power only to operate. I agree that a group 24 should be all you need in lite of your comments for use.
By way of clarification; I'm in Ontario, but ordered the 5er through a dealer in North Carolina. We got a great deal, because the unit will be delivered to another dealer in New York for pick up. (Thus saving us the 26 hour drive there and back to pick it up). As a result, we don't get the dealer supplied battery, and I'm pretty sure the dealer in New York where we are picking up will do us no favours. My plan is to purchase the battery, lube plate, etc. at Camping World or Pep Boys before we pick up. With the Canadian dollar trading above the US dollar right now, there are deals to be had.
Dean and Tracy Bachellier
Isobel,Evelyn, and Stuart
2012 KZ Durango D355BHS quad bunk with 5 slides
HiJacker 16K double pivot slider
2011 RAM 3500 SRW Crew Cab 4X4 CTD
"It's five o'clock somewhere...."
Get a deep cycle battery at Interstate Batteries. You won't be sorry. Get a group 31 battery as it will give you all the reserve power you need for those 5 slides. If the supplied battery box is too small, pick up the correct size to replace it. Camping World sells them if that is convenient for you.
My fiver came with a group 24 deep cycle in a size 31 box. When the time came, I replaced it with a group 31 (along with another, we dry camp). JMHO