For example, 9V batteries are basically just six AAAA batteries taped together. As reddit user usgiorgi points out, many larger store bought batteries contain a collection of smaller batteries.

It’s pretty creative to use a 9v battery as an enclosure. That’s what [Osgeld] did when building this amplifier. There are several advantages; they’re easy to find, it keeps a bit of the ...

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 ...

If you have some DIY projects that use 9V batteries, 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 ...

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 ...

If you’re looking for a neat DIY project this weekend, then this DIY 9V Battery USB charger could be a fun gadget to create. With only a few components, including a 9V battery, a female USB port ...