ORIGINAL: Tired Old Man
So in effect a 2,500 mAh A123 cell was available biut it was under the K@ name with license from the A 123 people if I read W/H Tom's statement correctly.
As for 50cc aircraft quality, there are quite a few thyat are so close to each other in quality that the only real differences in how they perform and how they will hold up is left in the hands of the owners and how they set them up. QQ, PAU, EF, WH, AEW and one or two others that I can't remember at the moment are very close in performance and quality. It most certainly does come down to what an individual wants to spend on planes in that group and how they want them to fly.
T.O.M.
You must be talking about 2,500 K2 batteries. They should not be refered to as A123's. That would be like calling all 2.4 radio systems Spektrum. A123 Systems M1 Cells are a patented Nanophosphate™ lithium ion battery.