Gene0581

Hi- I am working with my son to create a homemade battery to power an old fisher price dune buggy that previously was powered by a 12v battery. We created a voltaic pile with pennies and zinc washers and it achieves 12 volts plus (we reduced the voltage to just under 12 volts). However, it doesn't power the motors on the buggy (or one motor). We were able to power the motors with a 9 volt household battery. What is the required amperage to power the motors (there are two- 15 teeth). Also, how do we achieve this with a homemade battery? Much thanks- need advice!