Vlastimil Slinták @uart.cz · Jan 17 So, I grabbed one of my USB-C battery chargers (a design I made myself in KiCAD) and modded it to output 2.9V instead of its default 3.3V. Now the LED chain runs at constant brightness, powered by a 1000 mAh LiPo. Rechargeable, reusable, hassle-free.
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The best part? I can recharge the battery with any standard USB-C charger. No more fiddling with external AA battery chargers or throwing out alkalines. Just plug and go.