If you deplete your batteries below 12v
you will shorten the life and the capacity. Purchase a multimeter to check the voltage at the batteries. You have a SeeLevel monitor panel. I looked up a SeeLevel document and it should show the volts. You can compare that with the multimeter reading from the batteries. If there is a load on the 12v
system there may be a difference between what the SeeLevel shows and a multimeter testing right off the battery posts.
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
2010 Tundra 5.7L, Double Cab, 2wd, White