If you still have the Cellpro 10S, try charging your 10S pack with that. If it works, you either have a bad 10XP or have the wrong settings. If you're using the Cellpro boards, you should be using the default FMA settings for wiring. I know for certain that the boards work with both Thunderpower and Zippy packs which are both wired the same and just have a different plug. I read the manual from the FMA site about different wiring configurations for balance taps and found it confusing at best. If you're using TP or Zippy packs and FMA boards, the default settings for wiring configurations should be fine. Beyond that, I'm afraid I'm not qualified to offer much help. There's a lot of info about XH configurations on Pg 13 of their manual which might make sense to you if you have a different configuration. I never liked the balance boards and stopped using mine a long time ago. I have a 12" TP extension and modified the male end to fit into where the balance boards normally attach. From there, I either attach a TP balance tap directly or use a short adaptor from HK to attach a Zippy pack. The Zippy adapter doesn't change the orientation of the wires which is why I'm confused when FMA says that JST-XH is different. Stick with the default FMA setting and you should be fine.

Verne