Finally got it converted to a 2 pack setup. Wanted to go with std. battery trays w/ straps, by my LHS wanted $30 each for them & I seen these old RC10 battery cups hanging on the wall for $5 each. It works great for std. size 2S packs, but I was hoping to run my 2 Venom 8000mah packs for the mains & they are too tall for these battery cups. Oh well, maybe I can come up with a cheap mod before I have to brake down & spend the $60 on the Tekno trays.