Darkgenerals: That is exactly what I would be doing with these. They are new, identical, and i don't even have them in my possession yet lol I will be trying them on my mini-revo's $8 battery's first though.
Howardcone: The resistor would be between the pack ONLY while in the car, not on the charger were it would cause a false voltage reading. I would be putting them between two female connectors that then plug into the battery's on the car only. Them I'd just use a parallel balance board on the charger.