I have been using some cells for years and years, fully charged some are 4.18v, not had to re-cycle that many cells over the years.
Look at the advantages! Cost...........for the performance/cost ratio...........hard to beat!!!(dont think they can be beat bang for buck). Loosing a bit of mah over the years is really something not to worry about for me.
Be them 300 or 500 cycles, that is full cycles, so you might get 1000 -1500 part cycles. If for example you top them back up at 3.8v(just a rough example) that is a part cycle..........
Voltage wise it may drop, if it drops bellow say 4.1v from a previous of 4.2v(actual and not a charger issue) then you may decide to recycle for new due to having 90% capacity over 100%. As resistance build up, the cell will not charge up as much. One of say a set of 4 may not charge up the same after a couple of years, the other 3 would go into single cell lights and a new set of 4 would be bought(example).
Ideally store around 3.6-3.8v if not using for long periods,other than that just use and enjoy. Having a good charger,good quality cells and not asking lots of A every use will help over time. Slapping them back on the charger "hot" after heavy use, taking them right down low to 3v(or even less) will take cycles off.............
They are a lot tougher than many think, certainly not to be taken for granted though!! I charged a 25R up a while back on the vp2 3.8v setting(been charging 16650's up at time and forgot to switch it back to 3.6v). So i had an INR cell at 4.35v, still works fine, may have shortened its life(an unnoticeable amount as dont care any for cycle counting!)a bit............
If they do the job required, let them do it
once it effects run time........recycle and buy fresh! Being simple, i like to keep it simple! :laughing: Life is complicated enough with out adding to it(charts,numbers,cycle counts etc).
Just IMO