I see online that the MiniBMS idle current is 2.2ma. If your DC:DC
converter was connected and supplying power to the truck's 12v system, that
probably uses yet more current to maintain the body computer, radio presets,
and so on. On modern vehicles something close to 100ma of parasitic loads
on the 12v bus is not that uncommon.
I believe old miniBMS modules would eventually pull a cell all the way
down to zero. Newer versions, I think, would stop vampire draw at about 2v.
MrSharkey (or others) can probably give a more definitive answer.
My experience is that a small fraction of LFP cells discharged to zero
can be resurrected by charging. At least some of the cells that appear
to take a charge may not hold it.
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