All of my Duralite A123's have built on balance boards with a dedicated charge lead that uses a Jr connector. They use a Deans for power output. The leads are from Duralite, but are just standard JR style stuff. They are at least 3 feet long and I've been using them for years without issue, but they dont use Banana ends on the charger. There charger uses what looks like a transmitter charge plug on the charger end.
I've never had an issue with any of the Banana leads that plug into my PowerLab 8 charger that I use for LiPo's.
All of my Lipos are charged either through a Buddy RC parallel board or the standard leads that came from Revo with my Powerlab 8.
@Buddy5303 have you tried the leads from Buddy RC?