Foamdonuts......So you run stock? stock motors do make you feel your running with drag brake but never heard of them causing spin out exspecialy on carpet but if you run mod you most def. have a problem with the car that needs to be addressed.
TC3....the batteries fitting is a prob easy fix though if you like take a look at the post below for more info, basicaly takin a file to the slots in the chassis and/or battery brace should allow them to fit propperly