If one battery says 50 and the other 75, then the connection is not good enough, there should MAX be a 5% difference when disconnected from each other.

This is why i made mine in the "destructive" way, i don't want a sudden shutdown because connection is "bad"

All the battery's i have (Not N900) are also soldered good together because of this, my Electro ciao pulls 110A so this would be bad and would destroy parts of the battery if only some of the 36 cells would suddenly pull the hole load

Other mod i would recommend is zimon's mod