So we use this value 35.84Wh/37.44Wh x 100% = 95.73%

I really can't believe even at high current output 2A it does give the efficiency above 95%

The unit did not getting warm when discharging @1A but it get hot when discharging @2A.
The aluminium case helps a lot to dissipate the heat to keep the component cool.

Anyone tested the Xiaomi powerbank can share with us.