Volta’s pile — the first battery — was little more than silver and zinc discs separated by paper soaked in salt water. A classic classroom experiment is to build a pile from coppe… ...

Building a portable lamp with a 9V battery and LED bulb is a simple, creative DIY project that anyone can try. This video provides clear, step-by-step instructions for assembling a functional lamp ...

This simple hack on a standard 9V battery is an easy one to undertake. It's pretty straight forward, and all it requires is a quick solder to finish things up. It will give you power on the go and ...

Sean Michael Ragan at Make wanted an easy way to turn off his own projects without having to disconnect the whole battery. He couldn’t find a 9V power switch to buy, so he made one himself. To ...

Old American radios (and we mean really old ones) took several kinds of batteries. The A battery powered the filaments (generally 1.5V at a high current draw). The B battery powered the plate (much… ...

It's possible to revive a dead cell phone by using a 9-volt battery, along with something metal like a key, and your phone's car charger. Our own Lynna Lai tested it out.