Korishan said:P+ (3 & 4) is common Positive leads.
A- and P- are your negative lines
I would guess that P is for Pack.
If you look at the traces, 3 & 4 are the same terminal as the green trace runs around the right side of the board. All the FET's are connected to the common Pos side.
It looks like there is a current shunt between 1 & 2 and that is how it monitors the amps coming in and going out of the pack.
Again, that's a guess
Korishan said:you may have some cells that are different in resistance, causing them to not fill up as fast as the others.
However, it's possible, the bms that comes with the boards are not charge balancers in the full sense. They might not be active balancers, but passive. They may bleed off heat.
Does the bms get hot in spots when the cells are overcharged?
Ha thats close to nothing. Crazydaromer said:Many of those cheap ones only balance with like 50mA and even lower. So if you got them so uneven as you do you need to charge the pack for X hours at just 50mA... Because if you try to charge with 100 or more the ones in top will just keep raising. This is the big issue with the cheap bms systems that doesnt have active feedback.
Wattsup said:Were the cells balanced before you tried the bms?
daromer said:Just because they are even at 3.6 doesnt say they are even at top and the BMS will balance at top. So balance them up with the iMax first. neither less yes balance current is low on those.
You get what you pay for kind of
Thing is also that when already balance they should not need much more than 50mA current to keep in balance.