The problem is there are many different types of Li cells. Some tolerate a wider Safe Operating Area for power output and temperatures.
I don't want to get into the name-and-shame game with other manufacturers. The 3 brands mentioned are generally very good quality, and if you can source new cells without counterfeit/expired nonsense... they will perform as per their app notes.
The cycle limit is a function of whether your charger IC is smart, slow-charge/low-current-discharge, and if your firm uses capacity Boosting (stress costs cycle counts.)
>Or it decreases gradually and 2k is the worst case?
Anecdotally, sensitivity seems somewhat correlated with cell use/age. The more stress, and the faster the cell degrades.
I don't want to get into the name-and-shame game with other manufacturers. The 3 brands mentioned are generally very good quality, and if you can source new cells without counterfeit/expired nonsense... they will perform as per their app notes.
The cycle limit is a function of whether your charger IC is smart, slow-charge/low-current-discharge, and if your firm uses capacity Boosting (stress costs cycle counts.)
>Or it decreases gradually and 2k is the worst case?
Anecdotally, sensitivity seems somewhat correlated with cell use/age. The more stress, and the faster the cell degrades.
Best of luck, =3