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The reason for changing to Bus bars is after a couple of months of testing batteries and a couple of weeks of using them(not dry camping) plugged in but still travel and using DC volts, Victron looked fine 13.2v 68 percent, but the LiTime battery bluetooth reading was off, Volts were close but SOC was off, Before removing batteries I wrote this down #1 battery 100 percent 13.3v – #2 Battery 32 percent 13.2v – #3 Battery 32 percent 13.2v – #4 Battery 72 Percent 13.3v So 1st and 4th batteries used less or none compared to inner batteries, I know this is true because I pulled out batteries lined them on garage floor and charged them with a lithium charger,It has a led that turns green and charger shuts off, on bluetooth said 100 percent charging volts 14.4 resting volts 13.3. #4 battery 72 percent took around 3 hours to fully charge #3 battery 32 percent took around 6 hours to fully charge #2 battery 32 percent took 5 hours and 30 min to fully charge #1 battery 100 percent have not charged it yet but I bet won’t take long. That video the guy said if your using 2 batteries bus bars aren’t needed, 3 batteries they are needed 4 batteries are Absolutely Necessary, After I get bus bars wired I will test again in a few months. https://www.youtube.com/watch?v=_pQ0WjpSEa0