Over the past month I have been capacity testing batches of used pink samsung ICR18650 2600mah with 5 Lii-500 and 2 Lii-600. I've been using NOR test mode and charging at 1000mah and discharging at 500mah. However, on both models, slots 1 and 4 always test significantly higher, sometimes up to 200 mah higher. If I run a test and then using the same set of cells, swap the cells in slots and 4 and 2 and 3 and run the exact same test, they'll read entirely different. I thought the issue may have been the 12v power supply, but I've tried a 2a, 3a, and 77a power supply with no change. Is anyone else experiencing this? Are there cheap Chinese parts I could replace or would I be better off buying new chargers? I'm just surprised I haven't found anyone else reporting the same issues. In fact, people seem to speak very positively of these chargers.