The key to battery longevity is keeping them cool. I have an article coming out in a future KFactor about this topic. Virtually every plane I have seen does not have adequate cooling and this above all else determines cycle life (assuming you don't routinely overcharge or overdischarge). Look at the guys who almost always get good cycle life and their procedures and the cooling arrangement inside their planes and it differs from the guy who gets 30-40 cycles from a set of batteries. These results are very consistent, some always have good results while most cannot match their results and it is just a matter of setup and procedures.