for Kokam and RC-world..
the Kokams are maybe not the most powerfull cells (voltage under load),
and not the cells with most energy/weight,
but from my experiences (and i see this in many forums as well) the most reliable cells..
we empty our batts in rc-world usually in 5 - 8min, so lot of stress for batts
and recharge them often with 2C (or even more)
(so maybe more stress than in a electric bike-situation)
i can not speak for the bigger cells/packs you wana use in an ebike..
but one example:
i was comparing in same heli-application
Thunderpower vs. Kokam
thunderpower was lighter, giving 20% more capacity at same weight
my first Gen2-pack from Thunderpower failed after ~70cycles
the next was Gen2.5, i was told by Charly from Thunderpower that this would hold much longer -> ~70cycles
then the Prolites and Prolites plus came to the market..
i have not much cycles with the Prolite plus => 2years, stored at 20°C with ~50% charge inside
--> have now maybe 30-40cycles on them and the punsh has gone
my Kokam3200 is a little bit heavier, having not as good energy-densitiy like the thunderpower...
BUT: they are now over 200cycles old and still work... (same punsh, about 80% of original capacity)
i had meanwhile about 10 different lipo-brands.. the most reliable are the kokams (for me the 3200mah-cells) so far
looking into the german RC-forums: there are barrley cells with are over two years old and work still fine...
there is a good chance that if you find such a battery, its a Kokam..
hope you dont see this as a advertisement, its just the experience i and my friends made over the last 3 years...
and it is to say: we use smaller cells (350mah up to 5000mah) and stress them maybe a little more (up to 20c continouse discharge, charging with 2-3C (Fepo4 A123 with up to 10C in 5min *lol*)
for cycle-test under heavier loads (not only this 1c discharge-rates you see everywere):
here a - i think - very well done test of different cells at higher loads, good documented how it was done:
the new Kokam4000 cell: http://www.slowflyer.ch/downloads/tn07004.pdf
the Kokam4800cell, charged with 3C: http://www.slowflyer.ch/downloads/tn06007.pdf
Polyquest: http://www.slowflyer.ch/downloads/tn06001v2.pdf
Flightpower: http://www.slowflyer.ch/downloads/tn06002.pdf
Flightpower new formulation: http://www.slowflyer.ch/downloads/tn060051.pdf
http://www.slowflyer.ch/downloads/evo1500.pdf
you can find the links to the tests here:
http://www.slowflyer.ch/000000972c0e2a41b/0000009794081290e/index.php
the site is German (well, swiss), but the tests are made (i think most of them) in English language..