Used one season, charged and balanced on thunderpower 1010C with no issues balancing.
Used for sport flying with occasional loop and roll....no hard 3D.
Never overdisharged....looked after them like they were diamonds.
These have the non puff formula and cost me $275 each plus shipping.
Selling my 600E heli ....so no longer need these ........
Battery #1 - 29 cycles $110 shipped
Battery #2 - 30 cycles $110 shipped
Battery #3 - 15 cycles $140 Shipped