Ok I tend to go over kill on things most of the time but Have been spending way too much money for our next big Camping trip we have planned so I'm on a tight budget.
So I paid a visit to the people at atbatt.com & finally came up with this one for my uses.
Like I've say in my original post my only issue has been keeping the furnace going all night & the used car deep cycle that worked everything else perfectly just couldn't keep up it seems.
So I came home with this super HEAVY battery. 67.30 lbs!
hope my bow can hold that weight.
http://www.atbatt.com/leoch-12v-100ah-deep-cycle-gel-cell-battery.asp
Thanks to all you guys for your helpful info.
Lots more to learn about batteries than I realized.
