If there's one motorcycle tool you should definitely have for your Harley-Davidson, it's a battery charger that can double as a maintainer. This type of charger can come in handy whenever you need to ...

The circuit was developed to create a voltmeter that will be used to test car batteries while showing an indication using LEDs. Voltmeter – a device or an instrument used for measuring the electrical ...

Figure 1 This circuit works in most rechargeable batteries. It comprises a reference LED, LED REF, which operates at a constant current of 1 mA and provides reference light of constant intensity ...

Portable chargers are supposed to be the quiet workhorses in your bag, not a source of fire risk on your desk or nightstand.

Until fairly recently, vehicles were equipped with either dashboard gauges that monitored your vehicle's temperature, oil pressure, charging system, and fuel level; or warning lights that told you ...