Each of the selected lithium cells are designed to retain 80% of their capacity after 500 charging cycles. But this requires that each are not treated outside of their specifications, i.e. we must not exceed: max. discharge current, max. charge current, min and max operating temperatures, and storing batteries long term only between 80% and 50% SOC.
One charging cycle is defined as a complete discharge from full to empty followed by a charge to full again. If you discharge your battery from full to 50% empty and then recharge to 100%, that counts as half a charge cycle.
The lifespan of 500 cycles is valid when charging the battery to 100% capacity every time.
If you always charge the capacity to only 80%, then the number of cycles doubles (i.e. 1000 cycles) before capacity is reduced to 80%.
But charging to 80% is not so easy with most of today's chargers as they are configured to stop charging at 100%. The only charger that I am aware of that currently supports charging to 80% (or to any level) is the GRIN Satiator. Unfortunately this can only deliver a max charging current of 5A. A "hack" for the other chargers, is to manually abort charging by removing the charge plug when capacity has reached 80% or approx. 63 volt (for a 60V Nominal battery).