Samsung capacity were about 2489 mAh which was closed to Specification of 2500 mAh. Lillitoka Lii-500 smart charger was the tester. Took over 9 hours to test. Charging current 500 mAh, discharge current 250 mAh. Test high current usage on Emisar D4 flashlight, no issues! Will buy more in future. Recommended seller!