9V batteries are often found in devices that aren’t used very often. If you use a NiCd rechargeable battery you may find it completely discharged by the time you need it. Capacitors on the other ...

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 ...

this super small power switch is fairly easy to build and is mostly made from an old 9V battery. Sean Michael Ragan at Make wanted an easy way to turn off his own projects without having to ...

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 ...

For best results, always use a new 9V battery to power the memory saver ... Invest in compression replacement battery terminals. They're made from tinned copper and their compression fitting ...

Try making one yourself with a little help from a 9V battery and a few extra components. This simple hack on a standard 9V battery is an easy one to undertake. It's pretty straight forward ...

The VoltClip draws power over USB, instead of from a 9V battery. The VoltClip draws power over USB, instead of from a 9V battery. Andrew Liszewski is a senior reporter who’s been covering and ...

Luckily, there is a “hurricane hack” that shows a way to charge your smartphone via a 9-volt battery. In the video below, a smartphone, spring-loaded pen, USB cable, 9V battery and car charger ...