Disposable batteries seem so 1990s. Sure, it’s nice to be able to spend a couple of bucks at the drugstore and get a flashlight or TV remote back in the game, but when the device is a daily driver, ...

Matt: My solar-powered calculator. How long will it last? Is it a perpetual-motion machine that will go on calculating into the next millennium? Does it have any parts that will die off like any ...

Dismissing allegations of 'varying EVM battery levels', Chief Election Commissioner Rajiv Kumar said Electronic Voting Machines are totally "safe and robust," and have batteries like a calculator, not ...

Product Safety Australia, part of the Australian Competition and Consumer Commission, announced the Casio HL-820VA electronic calculator was being urgently recalled as it did not comply with mandatory ...

Calculators, LEDs, and other low-power devices can be run from a very basic battery constructed from a few pennies, zinc washers, and small cardboard circles soaked in vinegar. Instructables user The ...