too much money for that batt. comes with the wrong plugs as well.
Since you already have a lipo capable charger, get a 2s lipo.
this 2s 5000mah lipo hardly costs any more than that nimh stick pack: http://www.hobbypartz.com/77p-sl5000...se-bullet.html
That lipo will get you 25 minute runtimes easy. And you charger will balance charge that lipo in just a bit over 1 hour.
The lipo will add not just runtime, but power and top speed as well.
The only modification you will need to make to your truck is to swap out the stock battery post for the body posts meant for the lightning epx. These are taller, and are needed since the hardcased lipo is thicker (taller) than a nimh pack.