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 ...

It’s a project called snapVCC, and it turns a 9 volt battery into a regulated 3.3 or 5 volt supply. The idea behind snapVCC is simple enough; just add a circuit board to the top of a nine volt ...

Researchers have described the BadRAM attack, which is claimed to facilitate the breaching of processor security via rogue memory modules.

Here's how to safely set steel wool (also called wire wool) alight using nothing more than a 9V battery. It's not difficult but you must take care as the wool and the dish can get very hot - adult ...

Our evaluation included extensive discharge tests to find long-lasting alkaline batteries -- including AA, AAA, C, D and 9-volt options. We also considered the cost per battery for each option to ...