Need help fixing a Stihl AP 300 battery pack : r/18650masterrace
I got this battery pack with 4 flashing LEDs = the pack has to be repaired. So I measured each cell (group) for volts and ohms. One group of 5 cells was about 0.5 volt lower than the rest, so I took the 5 cells out and tested them. There was one suspicious cell that I replaced with a identical cell from another used Stihl AP battery pack.