Right now Im testing the capacity of some 18650 cells I salvaged from old laptops.
My idea was to build for a battery pack for a personal project with cells arround 2500mah and for the moment I have 7 of them with that capacity (I expect to reach 12 once I finish to test all my cells and this way I will be able to build a 3s4p battery pack).
My problem is that those cells which are arround 2500mah are not the exact same capacity, they range from 2359 to 2565 mah and I was wondering if this difference in capacity, which represents a 9% from one cell to another in some cases, would damage my battery pack on the long run.
Obviously it would always be better to have new batterys with exactly 2500 mah each, but since its not the case and I dont have a lot of money to spend on this project, I would like to know if ithat 9% difference in capacity would really make a difference.
Thanks in advance