When the power fails on a subzero night, your alarms are only as trustworthy as the batteries hiding behind their plastic covers. The chemistry you choose can decide whether a smoke detector screams ...

If you buy something from a Verge link, Vox Media may earn a commission. See our ethics statement. When you buy a product labeled “smart,” it should be better than the “dumb” version, especially ...

The RSA-400 looks like your ordinary, everyday smoke detector. The included Roost Smart Battery enables it to connect to your Wi-Fi network, and that’s how it sends alerts to your smartphone if the ...

Replacing smoke alarm batteries can be a hassle. It always seems that just as soon as you've installed fresh ones, the low-battery warning is beeping at you again. Many homeowners wonder why their ...

This battery backup circuit can be added to surveillance systems like alarms and others to power the circuit during mains failure. The battery backup will immediately take up the load without any ...