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 ...

While raising money on Kickstarter in 2014, a big part of the elevator pitch for Roost -- a startup based in Sunnyvale, California -- was that its Wi-Fi-enabled smoke alarm battery would forever ...

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 copper pennies, tin foil, ...

Having the right batteries on hand for all of life’s little gadgets is one of those small, but kind of annoying, adulting tasks. Like why does the smoke detector battery always aggressively signal ...

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 ...