All is great when the packs are brand new. All the battery tests I've seen in the magazines are with brand new packs. I want to see how these packs stand up after 50-100 cycles. The ratings for these Zippy batteries are 5 stars on hobbycity. Of course they're 5 stars. People rate them after just a few flights. Even I gave them 5 stars. However, after 50+ cycles on my 4 cell 5000mah Zippy's, I went back gave the batteries only a 3 star rating. My 10 minute flights now only are 8 minute flights, because the voltage falls too low after a certain drain.