Hi I got a small tiny 12s bms from LiTech.
One pin is missing. It’s not in the bag or box.
Looks like the battery 9 cable is missing.
Is it supposed to be like this? I know that 13s bms are very common. And maybe this is a thang bms makers do to go down to 12S.
Any thoughts?
No that’s normal, you got 15a charge only
It’s only fully filled up with fets when you get 15a charge and discharge
I’m not sure about your d503 though
Your d503 should be fine too, that’s a 13s based board that they gimp to work with 12s. They bridge one of the connections and leave it the wire for it.
You have 13 wires (unless I miscounted) which is perfect for 12s
Yes 13 wires total.
Just did not understand why wire no 9 was left out. and not the last like wire no 13
They do that so they can make 1 BMS and then sell it for different series combinations. I got a 12S BMS that is missing wires as well, because that model can go up to 15s.
dont worry, sometimes they put 3x 5a mosfets sometimes they put 5x3a mosfets etc
be carefull that small bms does not have balancing 99%
What? This is for the battery that’s coming my way.
Want charge only. No discharge.
Is the small BMS not what I think?
Yes but the charging current is going through those mosfets as well, if you would use diacharge on it it would also go through them but since your bypassing it the discharge current is going directly from the battery.
By the size of it the tiny bms looks to me that it does not have the balancing feature, but I would doublecheck that on the website
As the smallest bmss usually do not have it
He’s correct, that small BMS cannot balance. It still protects but only overvoltage cutoff of the highest P group. Recommend use D140
