I have 6 18650 cells from a notebook battery pack that I think should still be ok (the BMS of these packs had the reputation of going bad long before the cells). I have charged them individually and used them a little, but how can I find out what C rating they have? Also, how do I determine their capacity (mAh)? Drain them to a low voltage (how low?) and see how much I can charge them? P.S. I do not intend to use them in my mods, but this is the only forum where I’m already subscribed and where I might get this information.