honestly, at best with 5000mah packs like that I would make about 13 minutes guarenteed in 1/8 buggy.

You really want at least a 6000mah or better battery.

And since this is a truggy, the extra heft really won't make a difference between the 6500mah battery and 5000ish batteries you are using, especially if you using a truggy motor.

Its your money for sure, but I would hate to buy the wrong battery and have to rebuy anyway versus just doing it right the first time.