Actually, it has to do with the oxide layer in the Lithium battery. Good temperatures make it degrade slower, but it still degrades. LiFePO4 degrades slower tha

Actually, it has to do with the oxide layer in the Lithium battery. Good temperatures make it degrade slower, but it still degrades. LiFePO4 degrades slower than LiPo by a factor of 5 or better, but has lower power density (3.2V instead of 3.7V.) Yes, LiPos degrade with use. My five year old car has 80% capacity. My One Plus from beta has about 85% capacity.