Pat explained it clearly. If you have once low voltage, governor cannot compensate it. Simply goes for 100% and that is all it can do, if you have low voltage, mottor cannot make wanted RPM. And even worse - if you reach voltage limit on ESC, it will lower delivered power to maintainn battery voltage limit, it is much better than immediate cut off and following crash. I will call it as advantage of Spin, not " Jeti Esc doesn't like the voltage drop of Li-Ion cells ".
The reason is clear, if you compare Volt-Ampere characteristic of LiIon vs LiPol you will see large volt difference (and since flight needs some value of power - Watts, lover voltage means higher drain in mAh). Simply LiIon battery gives less possible RPM on given motor at given load compared to the same LiPol battery. Solution is either:
- use motor with higher KV (but it will use higher urrent)
- use prop with higher pitch (but it will give less power)
- use smaller sensitivity on Timer, so that it does not ask for such strong boost (but it will limit the boost)
- and yes, do not drain your battery so much :- )))
Lions ale lighter, but as you can see it is something for something.