With the cost of Life packs being so dirt cheap now, if you can wait a few weeks for shipping, that would be the better way to go. I have a Life in my one plane that has outlasted more expensive Nimh 5 cell packs per charge. I can fly for hours on the Life compared to maybe an hour on the Nimh of the same Mah ratings. They are lighter too. In fact I just got a 2500 mah 5C 2S Life for under $9.
http://www.hobbyking.com/hobbyking/s...dProduct=14077