I have two Wolfpack lipo polymer batteries that are 3300 mAh. 30c that with the help of an adapter I've connected in sequence to equal one 4 cell... However after connecting them and running the RC car it runs about like it would off of one nicd battery...no power to speak of...my charger shows them as a 4 cell at around 16.75 v.....when I connect them to my RC car my Mamba x speed control even beeps 4 times confirming it's a 4-cell lipo...everything checks out....any help is greatly appreciated