It finally happened, my 15 year old Interstate 12v deep cycle will no longer hold a charge and it is now time to replace.  My other, nearly 5 year old 12v is in excellent condition and I plan to keep it, a Trojan T-1275, 160 aH.

So it would seen prudent to look at the 100 aH lithium batteries available at this time.  What would you recommend, and would I need to replace the converter on a 2011 177?  I have been told it will only charge lithium to 80% but I am good with that as with the old setup i could boondock for 6 days when night temps were in the 40's and with a potential lithium, even at 80% I will still have more available aH to work with. 

We do camp in cold weather so I also realize I will have to move it inside for those conditions as well.

I would couple the battery with a 200watt suitcase solar panel with 20amp controller. Wire a pigtail directly to the battery and just plug the panel in directly when boondocking. Most solar panels these days with controllers have auto sensing with a lithium setting. With this setup, your boondocking experience will go from 6 days to infinite. Your limitation will be your water and storage tanks. 

It may seem like a minor change, but going from lead acid to lithium was a game changer for us.