So it sounds like you have either bad batteries or significant current drain (which could be a short). Have you checked the water level as Wayne suggested? If full, I'd pick up a battery hydrometer (something like this: https://www.amazon.com/E-Z-Red-SP101.../dp/B000JFHMRU), which you could also get at any auto parts store.
This problem should be relatively easy to track down.....
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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