Alternating and Direct
We're all advised to change the batteries in our smoke detectors once each year. This is truly good and affordable advice, and most of us are happy to comply. If you were to decide on a whim to replace all of the batteries in all of your battery-powered appliances or other devices that incorporate battery backup in their design on that mandated day, however, you might find the number of replacements surprising, the day a long one and the