[magman]

First, A spark is normal when you plug your batts. in. Remember, you are using quite a bit of juice to power your truck! The high pitched noise is also normal...just make sure your gear mesh is correct. I would cushion the sides of the batts as well. Keep them as tight as possible w/as little movement as possible. Remember, you want some air to go over, around your batts. for cooling purposes. With that being said, you also want the batts. as snug as possible to keep the cells from shifting around.

I look forward to seeing some pics. and I hope that this helps!