Rewind’s 9-volt battery-flavored chips (Image via Instagram/@rewindchips_nl) ...

The process begins with gathering the necessary components: a 9V battery, an LED light strip or bulb, an on/off switch, wire, electrical tape or a soldering kit, and Velcro or adhesive for mounting.

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… ...

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 ...