Battery packs and.....

[neweuser]

I need to ask a dumb question guys. i run my 9920 and 10xl, whcih was working good until i put my new chasis in. I was wondering if poorly built battery packs could reduce distance in the system? i can't think of any other reason why i can't go more than twenty feet now. i built my own 8 cell packs and seemed to be good, but new at it so not sure. I have replaced everything!