A practical concern is that the batteries in question will be powering our cottage, which is entirely off-grid.

It’s also unused for half the year, and for much of that half the solar input is effectively zero; for part it’s literally zero. Not enough to even run the Victron gear, never mind a heater. Spring temperatures often drop below -5C.

So we’ll winterise it by shutting everything off, BMS included to the degree it’ll let us, and the question is what SoC they sold be at for that to work.