If you move back two images you can see the cell compression bar holding the upper quarter of the cell. It seemed to do its job up high but there was nothing holding the cells in compression for the lower three quarters of the cell.


When the BMS allowed the cells to over-charge, at 3.65V per cell, this is exactly what can be expected. Seeing how bulged these cells were it is not a surprise at all. Charging at 3.65V per cell is just unnecessary and can certainly be damaging to your expensive investment.


Thankfully Mastervolt has now reduced the maximum recommended charging voltage to 3.55V per cell or 14.2V. In my experience & opinion this is a slightly better and certainly safer voltage but still unnecessarily damaging to the cells when coupled with multiple lead acid charge sources such as alternator, solar, wind, hydro gen, battery chargers or hydrogen fuel cells that may lack adequate LFP control functionality.


Please understand that it is not the 3.65V per cell that damages them, it is the lead acid "absorption cycle duration" that is simply held too long that causes this damage. If you could 100% ensure that every cycle would charge until the cells hit 3.65V, then the charging 100% stopped, this would be okay. Unfortunately this is not how the devices currently available operate or function with the exception of a very select few.