Quick and Simple LIPO Voltage Tester

thingiverse

This was a quickie project for checking LIPO voltages before parallel charging and can also check individual cell voltages of multi-cell batteries or anything using a 0.1" pitch connector. I already had one of the cheapie chinese LED voltmeters and just designed the 3D printed housing and added the test prongs. (Print other way up!) Instructions This uses two pins of a header strip for the prongs and the red and yellow wires are connected together so the battery under test is also supplying the DVM supply voltage. The LED display is 22.5mm x 10mm and the unit is reverse-voltage protected. The red and black markings are small pieces of 1.75mm filament pressed into the slots. Once wired and tested, the innards are filled with hot glue. Surprisingly, the heat didn't melt the PLA case. Before assembly chop off the mounting 'ears'. Decide whether you'll hold the meter in your left or right hand and orient the display accordingly.