Tested and prepared with special equipment which control all charge discharge parameters, logging charge/discharge curves . We check capacity, internal resistance, charge/discharge curve views (SOC 0%-100%) for every selling cell. Cells prepared to 60% SOC before shipping. This mean about 8.2 V on cell. Depend on four price category our selling cells have measured capacity 3000 mAh - 4500mAh, and internal resistance 18 mOhm maximum.