This automatic AA battery charger is wonderfully over-engineered. - The Verge

Over on Hackaday, Max.K has shared their design for a charger that can automatically load and eject rechargeable AAs. Using it is as easy as dumping dead batteries in the top, and grabbing fully charged ones from the bottom. The charger handles everything else, including rejecting AAs that aren’t rechargeable. If you want to build your own, you can find plans and schematics available on GitHub.

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