(CNNMoney) — If there’s one dumb device in your home worth making smart, it’s your smoke detector. It chirps when your battery is low (inevitably at 3 a.m.), it goes off when you’re making stir-fry, ...

Since I’m starting to use more 9V rechargeable batteries, I thought it would be a good idea to build a simple 9V rechargeable battery for my friendly guitarist instead of having to urge him to look ...

Sure you could go buy a USB charger off the shelf, but what fun would that be? Try making one yourself with a little help from a 9V battery and a few extra components. This simple hack on a standard ...

Your remote control needs them. So do toys, flashlights, wall clocks, milk frothers—even many smoke alarms. Batteries keep the juice flowing. And while our gadgets ...

Electronic enthusiasts looking for a way to control power to the next project from a 9 V battery may be interested in a small device called snapVCC. Available to purchase from the Crowd Supply website ...

In this article, I will take apart a Li-ion alternative to the classic 6F22 9V battery. This battery is a Chinese 9V/500mAh USB rechargeable Li-ion battery (sold under the brand name infinite). The ...

Consumers use 9V batteries in the home and office. Many smoke detectors use this type of battery, as do clocks, some types of flashlights and walkie talkies. Owners of a 9V battery should check a new ...