Bit off topic, but to finish my observation from last night and this may be of interest to the OP as he has the same
battery I believe?
So just after some extended charging (where, I believe, Cells within a Lithium
Battery always are out of balance to a degree due to the fact that no cell is identical to another, even though the manufacturers try to match as closely as possible the various cells in each
battery),
Battery 1 (4 cycles) has a range of 0.065V and Battery 2 (52 cycles) has a range of 0.08V between the highest and lowest values.
After the BMS has done its stuff while the batteries are under little load or charge the cells are pretty well matched up
Battery 1 (4 cycles) has a range of 0.003V and Battery 2 (52 cycles) has a range of 0.03V between the highest and lowest values.
The second
battery is a little more unbalanced as it is currently more active in terms of charging, but will balance out more when it is more 'at rest' (even though these are in parallel, just like with Lead Batteries, there is a difference between them. It is only when you have individual cell or
battery monitoring you actually see this. a standard
battery monitoring setup like a
BMV on a whole bank doesn't reveal this detail).
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