Internet-Connected Battery Could Bring Smoke Alarms Online
A startup has come up with a simple way to make smoke and carbon-monoxide detectors more useful: a nine-volt battery with built-in Wi-Fi. The battery can alert you on your smartphone if the alarm goes off or the battery itself is about to die. Roost, the Sunnyvale, California-based company behind the battery, plans to sell the batteries starting next year for $25 to $35.