Laptops, phones, etc have a poor lifespan because they are frequently discharged from 100% to almost 0%. It is better to discharge them from 100% to 50% and then recharge.
Batteries generate heat during charging and smart phones can get hot during heavy use. Without good enough cooling the lifespan of the battery drops.
It is called SN curve:
It shows a bit different picture for Li-ION that I remembered.
LiPo batteries do not have a memory effect, and you should avoid deep discharges.