The twirling cell phone batteries are not yet in production, they are just a design, so I do not think they will begin to be used in a widespread way. I do, however, think they are a great idea! They remind me of the crank radios or flashlights where you spin the lever to recharge the battery. It is a great way to harness our own human power! When these do come into production, I definitely want to get one.
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