Make three exquisite boxes.
Place the 4056 charging pad in the narrow end of the box.
Put the spring on the other end and do the negative pole.
Put a copper plate as a positive pole in the front end.
Make a charging line.
I changed the inner core of the phone line.
Open two holes in the head，and put the USB cable on the welder.
Cut down a piece of plastic for the indicator light window.
The appearance after putting on is as follow. And the power indicator marks on the above.
Add a charging head to test.
Put in a section of 18650 lithium battery and charge directly.
After charging, the transformation of battery voltage was successful.
For the convenience I made two chargers, which charge 18650 conveniently and quickly.
The production is finished, welcome to discuss.