My iMAX B6AC is a Chinese knock-off !

Checked all the subpacks and all have 16,4V

So I'll continue like you recommend...

I'll take one by one and cycle 5 time - discharge at 1A until reach 12,6V

Charge at 5.5A for 60 minutes
Charge at 0.5A for 90 minutes
1A discharge to 12.6V, 5.5A charge, 20 minute wait between cycles, 5 cycles.

and also I'll keep a fan on subpack.

10x again for help !

 

You may find that the knock-off B6 have real trouble with early charge termination once you get going. They seem to work okay for a while, but then they crap out. Sometimes, replacing the leads with higher quality ones help as the voltage may be more consistent, but sometimes, the B6 is just junk.

Good luck,

Steve