Lithium cells bulging - what are the opinions?

In your case if you did not have the BMV, the system would have fixed itself within a week or 2 without you knowing and you would not have any bulging cells. All while you were happily drinking a cup of coffee without a worry :slight_smile:
You would have use a bit more Eskom power though, but that is much less then having to replace a battery cell would cost.

I think the real issue here is how we define the State Of Charge vs. how different systems define SOC.
The BMV was designed for a lead acid battery where you had the total voltage as well as the current flowing in/out to calculate the SOC.
These days the BMS we use for lithiums read individual cell voltages and adds that to the logic as well as current in/out and total voltage. I think this is better and safer.

If a cell imbalance happened in a lead acid it would eventually destroy that hole battery cause you did not know about it.

If you don’t look at the cell values in your SOC calculation then why do you have a BMS? You are treating your lithiums like lead acids.

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