I've got a traxxas power cell overnight charger that came with my stampede when I bought it. It says you can charge 7 cell NiMH battery packs with it and that 1500 mAh takes 4 hours and 3000mAh takes 8 hours to charge completely. I used this charger with the 3000mAh 8.4v 7 cell hump battery that came from traxxas with my stampede but I just bought a new Dynamite Speedpack 4500mAh 8.4v 7 cell hump NiMH battery. Can I use this charger with my new battery and how long will it take to charge approximately? Thanks