Ive just got a hyperion 1420, I used to run a 10S 2P LiPo pack on a 16" folding bike max speed fresh off the charger 13mph. I decided to make use of the full 14 cells that the 1420 can charge. I have added a 4S 2P to the battery pack to make it up to a full 14S 2P the problem is i have 2x5 cell and 1x4cell balance leads these have to be converted to 2x7 cell balance leads. How would I do this?
I think you could make a custom harness using 2 x 6 pins and 1 x 5 pins JST extensions from hobby king, cut the male connector and then spice all the wires to a pair of 8 pins hyperion connectors with their female connectors removed. Pin 6 from connector 1 is joined with pin 1 from connector 2 and pin 6 from connector 2 with pin 1 from connector 3 (they are in series)
If you want a single full proof connector, you could use a DB25, to carry both the cell taps and the main power positive and negative (each on multiple pins to split the current load). That's what I did and I think a few other members as well. One connector, no mistakes and as a bonus, you can leave your pack on your bike, connected to the controller at all time.