http://www.amazon.com/The-Source-S-K.../dp/B003TFEE28
This is a bit pricey but would have many uses besides blowing out a computer. Goes with Neil's idea but this is everything needed.
RC-Monster RC8T 1515 2.5D/MMM/5s RC-M 4500mah
SC10 MMPro 13.5T 2s NeuEnery 5000mah
RC18T Mamba 25/5400kv 2s lipo + 6s NiMh