Assuming 3-4 days at same site. If I should get a second battery, what are good options? I've heard lithium iron phosphate batteries are lightweight and last the longest. What are others doing? Thanks
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NWOL EST. 2006
ADVENTURE TRAVEL ENTHUSIASTS DEDICATED TO OVERLAND EXPLORATION
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Have you considered a Genesis Dual Battery System? If you are wanting 3-4 days out of your setup without running your engine you may need more than just a second battery. If it is over 80* and you are recharging phones or other devices or running a radio you are really going to need a solar panel to assist.
Regardless of the power source you really, really do not want to rely on the crappy factory wiring to the 12V outlet in the rear. I would strongly recommend running at least 8ga (6ga would be even better) off a dedicated circuit for the fridge from the battery.
LiPo4 batteries come with special conditions, make sure you familiarize yourself with them before dropping the significant expense. On a smaller scale I went with two Odyssey AGMs without realizing the OEM charging system in my old JKU wasn't fully up to the task of their demanding charging schedule. I ended up needing to prematurely replace them.
Have you thought of a second battery and a solar blanket? This seems to be a popular choice when extending power options on your vehicle.
Dan