I once had only 3 of them so 12s 15p and had a lower voltage then my charger which caused the cells to get bulk charged. I did that 3 times because the 4th pack wasn´t ready yet back then.. Maybe it´s because of that. They got hand warm when they got charged but I have stopped doing that all 10 min to get the cables get cooled down..
If I remember well are you the one that you were charging your battery pack with the eaton PSU while you had only 12s ?
if yes I am sure you've damaged the pack because you couldn't control the amperage so eaton was giving the maximum current.
I think Alex warned you about this.
After how long did you build the rest of your pack ?
It seems that some of your cells get empty first, that's why you are not able to use all the available capacity.
From my experience 18650 cells are very sensitive with fast charge and you reduce their life dramatically.
For long life you must prefer slow charging, no more than 1-1.5A per cell. believe it or not I use a very quality 95% efficiency
expensive meanwell PSU that is only 280W. when you don't want to charge your bike twice per day you can charge it slowly overnight.
I charge it inside the house so I had to find a good completely quite charger without fans.
Now I can watch films at the nights without to hear any annoying noises from the power supply.
if I want to charge my battery faster then I use my eaton PSU.
keep your pack for another 6 months and then build a new one and try to charge it slowly slowly.
it's the same with women, you speak you speak you speak to them, at the beginning they don't listen
and then slowly slowly slowly they listen to you.
if you cook beef at the oven (slow cooking) 170 degrees of Celsius for about three hours
then the meat becomes sooo delicious and soft that you want to eat till you die.
I was thinking about options that are not so obvious.
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