"Good" 18650 cells present a voltage between 2.7V ... The other application I found was as a power source for an Arduino project. This one required the purchase of an appropriate battery holder ...

The latest addition to my collection is a cheap portable power supply module labeled by its seller as “18650 Battery Shield (V3) for Raspberry Pi & Arduino”. The pictured shield holds a 18650 Li-Ion ...

Just because an 18650 cell takes a charge doesn’t necessarily ... and everything from the STL files for the 3D printed enclosure to the MCU’s Arduino-flavored firmware is provided.

This DIY gas leakage detector is designed for educational and basic monitoring purposes. For critical safety applications, ...