Terrible. Bought these to replace some old, tired RDQ packs. I've flown/ charged them approximately 30-40 times. Always storage charged afterwards and never particularly abused them in flight (low voltage etc.). 2 of the 8 batteries I've purchased are so bad I no longer consider them safe to use. The remaining 6 are not far behind. Flight times down, Pack IR and charge times way up. Save yourself the trouble.