Single Cell 18650 Powerbank casing

thingiverse

Since I had a few of those giant giveaway powerbanks on hand and needed some smaller ones for an upcoming project, I decided to create a small casing for them. The resistor visible in some images has a value of 1 Megaohm and pulls both datalines to the battery voltage so that it can be read by an Arduino. If you also want to do this, don't connect the battery directly to the datalines! USB is 3,3V logic, using 4,1V in the worst case directly, will damage devices! In my project I connected the +5V wire to the Arduino Vin pin, ground to ground, and one dataline to an analog input. (You can't read the voltage via the built-in socket). If you want to modify my design, I also uploaded the FCStd file for FreeCad 0.17, 0.16 will display only garbage.