With batteries, there are powerful, light, and cheap. You only get to pick two.
I'm having a hard time understanding why you didn't put the proper size battery in it.
here in Oologah, Oklahoma it has to run faster than 22 mph to require a license plate.
however, if on pavement, you better have running and stop lights.
and with a 36 volt battery bank in my golf cart, i just run on the grass until I get to the post office :grin3: