Battery Voltage Tester

thingiverse

This is a setup for a mini voltmeter and momentary contact pushbutton switch. I have a lithium-ion battery in my motorcycle, but I noticed that lithium batteries often don't start when they get low. To monitor the condition of this battery, I installed a voltmeter. It's attached to a tube handle on the motorcycle using zip ties. When you press the button at the top of the case, it displays the current voltage of the battery.