To me much more important than loss of capacity after certain number of cycles/time is how packs hold under load, which is influenced by increase in internal resistance. Certain chargers, like Power Peak Infinity from Robbe, do measure it.</p>

I have Kokam H5 3200 30-50C cells in 6S packs and they have 180mOhm internal resistance after being charged from 3,7V/cell at 1C. At the same time Flightmax 6S pack of 3600 30-40C has 80mOhms charged under the same conditions. In practice this reflects as 700rpm more on A5016S with 16x10 prop in favor of Flightmax.</p>

Also, according to Kokam hereyou can see that with 80% discharge rule, capacity loss is just 6% after 2500 cycles! So on a 5000mAh pack the loss would be 300mAh. More importantly is that I have noticed exactly the same loss in capacity on packs that are some 20 months old either sitting on a shelf or being used with 80% rule, some 5%!</p>

But again, loss in capacity is not my worry, if only would packs maintain their internal resistance after 150-200 cycles or 2 yrs time ...</p>