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UPDATE: Went out and measured the voltages with a multi-meter. Each was spot on 3.33v. The BMS gave cell 4 as 3.239v. So I removed the balance leads and tested each wire. Resistance was 0.0. Testing required running a paper clip into the plastic connector so that I could get access to that end...

Some images. Batteries 1 and 2 look like this: Battery 2 looks like this: The delta can be over 0.2v. I would guess that that would mean that the low cell is pulling the others down, no?

Got it - you want a fixed identification of each physical cell, vs. it's functional position. OK, so the batteries are , "George", "Sally", "Algenon", etc. ;)

Pedantic question. Letters vs. number? The BMS uses numbers. Might not batteries on letters and cells on the same numbers as the BMS work as well? Not trying to argue, but to understand.

Did. Will redo.

This beast, available from Amazon, does appear to be made for vehicle mounting. https://www.fleetwelcome.com/

Built three 280Ah batteries with EVE cells and Overkill Solar BMS. to mount in my overland camper. Charging is from solar, alternator, and Magnum inverter/charger. Two batteries have been textbook perfect in about two months of use. This includes induction cooktop, a ton of fans, and overnight...

Will do, but I joined this thread as they appeared to be the same. In fact, you may have already answered one of my questions - Cell 4 is the one closest to the + terminal, no?

I have a similar problem. Built three 280Ah batteries with EVE cells and Overkill Solar BMS. to mount in my overland camper. Charging is from solar, alternator, and Magnum inverter/charger. Two batteries have been textbook perfect in about two months of use. This includes induction cooktop, a...

Jason is the outlier on this, but having met and chatted with him, I take him at his word. IIRC, Earthroamer long used window air conditioners in their vehicles.

Commonly reported among off roaders. Hence my question.

I have heard it proposed that residential A/C units (window/split) will fail when used on RV/Expedition vehicles due to vibration. Does anyone have any real data on this?