18650 charger with voltmeter
thingiverse
I use a small 6V solar panel with a tp4056 module to charge my 18650 battery for "free". Charging a cell from a small solar panel takes a while and tp4056 does not have a percentage charge indicator. So I added a mini DC voltmeter to the system, to be able to check the voltage if the cell is close to being fully charged and I can replace it with another one or i have still plenty of time to fully charged. To clarify, standard 18650 battery have 2,5 or 3V when is discharged and 4,2V when fully charged. With so many elements the whole system was already quite a mess of cables, so I decided to design a simple housing. On the left side is a micro usb port from TP4056, on the right side is a DC jack socket that can safely take input voltage range 4.5 - 6V. In the upper part is located a DC voltmeter screen, a voltmeter activating button and a 18650 battery holder.
With this file you will be able to print 18650 charger with voltmeter with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 18650 charger with voltmeter.