Tony I odered two. When I received them one had a dead Cell. I spoke to Hobby King they asked me to plug it into a balancer and take photos. Which I did and sent. It has been six months and have still not received a credit or replacement. Made the other battery expensive.
OK, I got a replacement for the battery that turned up DOA, this one was 3.8X volts across all 6 cells. Happiness filled.
Now have a couple of flights on each of two batteries in my HK600GT with T600-1100KV motor.
Mainly just very gentle hovering to break the batteries in, but OMG does it jump when you punch it.
These have PLENTY of power for a 600 size Heli.
After doing 3 full cycles with a charge rate of 1C and discharge of 3A in parallel the packs seem to get better balanced (within 0.010v). I did notice that the cells did get unbalanced when down at 3.3v. Was able to put in 5000-5100mAh in each pack from a full cycle.
Have put in 2 flights (hovering) on each pack for 5mins and they came down cold & well balanced within 0.006v. Put back in 1400mAh.
Extremely happy with the packs so far. Just hope I can get 100 flights out of each pack.