Powerbank 50Wh

A 50Wh Powerbank (4 cells parallel) case with LED Light, 2 USB-A Connections (out 1A & 2,1A) and 1 Micro-USB-B (in 1A).

My measurements for the INR 18650-35E Cells from Samsung in this setup:
__Load:__
11570 mAh (~5V)
11535 mAh (~5V)
11404 mAh (~5V)
11469 mAh (~5V)

__Unload:__
8485 mAh (~5V)
8578 mAh (~5V)
8517 mAh (~5V)
8558 mAh (~5V)
8429 mAh (~5V)

The datasheet of the cells said: 3400-3500 mAh at 3,7V so in theory __50,3 to 51,8 Wh__.

The everage load is ~57 Wh
The everage unload is ~42 Wh

The datasheet of the PCB said conversion should be >85%.

If you want more information about the cells, [klick here](http://lygte-info.dk/review/batteries2012/Samsung%20INR18650-35E%203500mAh%20%28Pink%29%20UK.html)

Battery positive connects with chip B+,battery negative connects with B-.Please notice that don't transposition,or it will cause __great damage to the module__.

To check the status of the powerbank you have 4 blue LED´s (I don´t like the LCD PCB boards