I've always used a 700 mah 4.8 volt Nicd in my airplanes...Does great, absolutely no problems. In fact, I just bought a replacement

I've got a 700 mah nimh sitting here that is also a 4.8 volt pack. It's about 1/3 the weight of my nicad pack... It's brand new and I got a great deal, so I had to go for it. I didn't think about it until AFTER buying it if it's ok to use.

Can I use it in my Sledge? How will it handle full throttle spins holding everything to their limits while throwing the sticks every which way all the way down?

Assuming I pull out in time, can a nimh handle it?

Sure would be nice to save a few ounces, if not just for the psychological effect...