[JoFreak]

As for the batteries, yes, it is definately OK.
Tapeing the tires: I turned the inside out, cleaned the surface I wanted to put the tape on with alcohol. After that I took duct tape and put it on. You should put the tape on straight so you don't get a too bad unbalance. I first taped one half of the tire (like left half or right half), without overlapping the tape at the ends, because my tape was too narrow to cover the whole tire. Then I taped the other half starting the tape on the opposite side of the tire (take where you finished the left/right half, then turn the tire 180° and start the other half).
After that I wated a few secs, so that the adhesive of the tape can connect better to the tire and turned the outside out again.
After that I put some holes into the tire for venting the tires, but this depends on what sort of rims you use and on your personal preferences.


Edit: It worked great! No noticeable unbalance, and absolutely no visible balooning.
The tires do get a little "stiffer" though, but I don't think it's too bad...