- ThunderPower Magna 2700mAh 5S 70C
- Battery temp. after landing 35°C / 95°F  (ambient 75°F)
- Cooled-off before charging
- Balance charged at max. 4.0 amp (1.5C) to 4.2 V/cell
- In-flight discharge as per diagram attached

Three of my total of six packs have now reached 60-70 cycles showing 18.5 V after landing idle voltage.

How many more cycles may I expect to reach before the lowest in-flight (loaded) voltage drops below 3.4 V/cell or 17.0 V ?

Peter,
in my opinion, the best way to monitor the condition of Lipo´s is to measure the internal resistance.

Peter,
in my opinion, the best way to monitor the condition of Lipo´s is to measure the internal resistance.

Thank you Wolfgang. As my charger does not offer IR readout what I intend to do instead, is flying the batteries until the castle edge log shows 100% power out to motor in the last (clover) manoeuvre.