Hi Folks,I have two sets of VTC4 batteries that are in parallel and have been happy married couples since when bought new,I'm wanting to build My version of hammer of god,V2 and it is two sets parallel and then each is run in series to come up at 8.4 volts and the combined amps of each set of two,and that might be around 40+amps....All batteries have the same charge cycles,and are the same age....See any problems?....Z