Simply perfectly performing lipos. Been putting about 10pcs each through the (10x) and they deliver what a fouride 5" need;) Was pretty could though so flight times might be longer in summer. Got about 5-7min...
One thing (which might be my jb charging board): All of my 10 battery have pretty loose balancer contacts on my charger and cells often dont get recognized. Makes charging pretty risky imo if one cell doesnt get ballanced