RE: Li-PO or NiCd Pros and Cons
Your original questions was lipo vs nicad, how about nickel metal hydride? They costs about same, usually less than nicads, are lighter and have very high discharge rates. The lipos are still better but the nimh might be a good alternate if price is and issue.
Try the guys at http://www.unipros.com/cbpsite/loosecells.asp?session_id=188183 and compare the 1400, 1800 and 2100 red CBP to Sanyo nimh. A good example is the 1800 mah CBP 25 amp dishcarge at a cost of $2.50 per cell vs the Sanyo 1950 at the sames amps but a cost of $4.55
One other comment about lipos, they usually wont' survive a serious crash and if the voltage drops below about 2.8 per cell they most likely can't be recharged again.
Just my 2 cents worth!!
Good luck