Jules_Theone
Member
I have lots of 18650 Li ion cells from laptop battery pack, I wanted to know if there was a way to compare them with each other to determine the good ones, bad ones and ones that can be paralleled together to make a larger capacity pack. I have measured the terminal voltage, discarding the ones reading less than 2.8 volts. most of the packs I have dismantled had two cells in parallel and three or four series so have left good pairs of cells connected together. I was thinking of charging each cell up and discharging for a certain time and grading them on the final terminal voltage. then parallel similar cells and make a pack up with the best ones. because the cells are going to have different wear on them, I'm going to have a PIC monitor each parallel group and charge each group separately rather than in series. are there any other things I should consider?
thanks,
Jules
thanks,
Jules