Wouldn’t it be cool if you never had to charge your cell phone? I’m sure that’s what a lot of people were thinking recently, when a company called BetaVolt said it had developed a coin-sized “nuclear battery” that would last for 50 years. Is it for real? Yes it is. Will you be able to buy one of these forever phones anytime soon? Probably not, unfortunately, because—well, physics. Let’s see why.
All batteries do the same thing: They produce an electric current to do some kind of work. But energy isn’t free. If that work is blasting music on your Bluetooth speakers, there has to be something that decreases in
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