Your fuel will be fine over the winter. If you can cap it and store it in a dark place, that would be good. I leave all my batteries on trickle charge. If you can not do that, you could charge them up and take them in where it is warm if they are not already. I replace my battery packs every other year. If you use nicad, they are only 8 bucks a pack, why take a chance. As previously stated, put lots of after run oil in the motors and they will winter just fine.