I think Tom said it as well as it can be said. I will be building a 2 M electric shortly and I will wait to the last minute for battery purchase. Right now it looks like TP 5300. The olnly reason is because they seem to have the best track record at present. I am waiting as I am hoping a new and better alternative will be out before I have to buy them. I have posted before that I do not think we are really "there" yet with regards to a battery meeting our requirements. With the currewnt crop of cells either longivity needs to go up or price needs to come way down.

I did take a look at the Kokam web site directly. kokam.com They do have information on a 4800 mah cell that appears to be rated at 20C. Looks like it might fill the bill if their product info is correct.

http://kokam.com/product/product_pdf...0mAh_Grade.pdf

10 of these cells would weigh about 40.5 oz. I guess a pack (or 2 5S's) will be a bit heavier with wiring, wrapping etc. If their advertising of cycle life of > 500 cycles was a reality at the discharge rates that we use then I would suspect that they would take over market share in the pattern community. Tom is right however that most of us would need to see a track record or a guarantee of so many cycles before spending that much money on an untested product.

Stuart C.