Please refer to this thread for my battery upgrade last year.
After a year of this 6V Lifeline upgrade, I have been happy with its performance, with 12,000 miles on the rig.
* I get two nights boondock with 50 deg days and 25 deg nights (to 50%charge). (Thermo temp 70 when we are there, 50 at night). Previous original batteries lasted only one night.
* I get less than 0.1 v decrease in charge per month now in storage, before was up to 0.5.
* I don't remove batteries from the trailer now. With the old set I did and stored them in the garage. No leakage so far.
Just the facts...