Does anyone know how to wire two 4s lipo packs into an 8s BMS? Both lipos have 5 balance leads but the BMS balancing port has 9 leads.
Thanks
in brief, those 5 wire leads overlap. there is always one more wire than the series count.
for an example let’s show 2 2s with the leads connected for a 4s cell:
each | is a balance wire, + is positive side of battery, - is negative.
a 2s battery would have |±|±| so to turn two of those into 4s |±|±|±| you would combine the positive power lead of the first pack with the negative power lead of the second. you would do the same with the balance wires |±|±|<-this wire would combine with this wire->|±|±|.
If this isn’t perfectly clear, then just charge each 4s by its self, with a lipo balance charger, and a parallel charge port.
Also 2 4s packs can be combined to form either a 8s1p, or a 4s2p. you would need 4 packs to achieve 8s2p