Last winter I bought lithium ion batteries from Starlight Solar in Yuma.
So far am amazed at how much better they are than my old AGM battery. For a test I turned on the A/C and it ran perfect until I turned it off. I couldnt do that with my other battery, voltage goes too low and inverter would not start it. The voltage never goes below 13.1 on these batteries until they are almost empty. Another thing is it charges almost twice as fast from my solar panels(about 1500 watt).
The price was high, about $3200 for 360Ah but that also include battery monitor in the RV and some other work and parts. The battery monitor can be hooked to your TV set and has a seperate display I put on the dash. Lifeline battery was going to be $1900 with battery monitor. These should last me over 10 years as I only use about 150AH per night.
Starlight Solar lithium battery
