Car Battery Voltmeter

After experiencing a battery drain, I became much more attentive to the battery's condition.

Initially, I wanted to buy a cigarette lighter with a voltage display, but I couldn't find a reliable brand.

So, I decided to make one myself.

The materials used include a 0.28-inch two-wire voltmeter head, an 8*8 push-button switch, 4 M2*5 bolts, and a twin-core wire with an outer diameter of 1.5mm or less. The voltmeter is fixed in any position using 3m double-sided tape.

Connect the wiring to the cigarette lighter output terminal inside the fuse box. The voltmeter can be turned on and off with a button.