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My phone charger still charges my phone but it won't work on my ereader. The other charger works on both. WTF?

@irina @pettter Depending on which USB standards both devices support, there are various types of negotiation going on. The oldest standards just put various resistors on the data lines.USB3 has a fully-fledged digital protocol for negotiating maximum current and voltage
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Wandering Shop

The Wandering Shop is a Mastodon instance initially geared for the science fiction and fantasy community but open to anyone. We want our 'local' timeline to have the feel of a coffee shop at a good convention: tables full of friendly conversation on a wide variety of topics. We welcome everyone who wants to participate, so long as you're willing to abide by our code of conduct.