Testing my newly bought Mi 5200mAh powerbank:
I was able to get 85% power output efficiency during my initial testing.
Yun din ang naka indicate sa website nila up to 85% conversion rate
(5200 X 3.7) / 5 = 3848
3271/3848 = 85%
Not bad for a low-cost powerbank :)
Next to test is my 10400