From Apperance Battery Type: Nominal Battery Capacity:
Li-‐ion 18650 x 4 10400 ( 4x 2600) mAh 3.7V x 10400= 38.48WH
From Measurement Output mAh: 6250 Output Voltage: 4.9 Discharge current: 1A Discharge battery cut off 2.85V Battery current: 1.45 Total output watt: 30.6WH Formula: A * Battery V * efficiecy = Output mAh * Output V Efficiency Test Output Voltage 4.9
Counter Efficiency Test 30.6 WH / ( 3.7V x 10400mAh) = 80%
Result PASS Total Nominal Battery Capacity: 10400 ( 4x 2600) mAh Actual Output: 6270 mAh Efficiency: 80% Tested by Minnix Hong Kong Ltd on behalf of Groupon HK. 10/7/13