dual cell
 

i was just doing a duall cell on my car when i put it on my AC chargher the car would make a sound kinda like a vzzz sound why? and the car only works while its on the charger it wont work when i take it off! oh and i though it was short circuited but i checked everything twice and it wasnt, is it cuz my batt is too old?

maybe your batts got wreked cuz its not charging the batts, the electricity is just runin througth battery up to the pcb and that may wreck the pcb. at least i think so but, im not a pro at this

well i undid the whole thing 5 mins ago and i found out one of my batts was leaking so i undid the whole thing and im gonna redo it at a better time, thanx for the help though

sounds like u put 2 much heat on your battery when u were soldering it. cause it to break when the electricity went through it. just replace it. less heat next time when soldering and make sure you clean your hands and chassis good. battery acid isn't nice to have around.