In case anyone ever doubted the power potential of an A123 battery, I think this video should pretty much sum up the capabilities.

http://www.youtube.com/watch?v=qcvmvrmTMMk

Now, I don't think it will turn over a large 1-ton diesel (maybe in a 4600 Mah configuration), but this is pretty impressive. That battery he used was a 4 cell 2300 Mah pack, weighed 12 oz., and started his car in -20 degree weather. Not bad!

Chad