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Redox-Lipo-Adapter
PCB that replaces the coin cell battery of a Redox keyboard by a rechargeable LiPo battery
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I really like my wireless Redox, however, I find that having to replace the coin cell battery is kind of annoying and wasteful. So I designed this mod. This PCB replaces the coin cell battery of a wireless Redox keyboard, it has a USB-C connector and circuitry to charge a LiPo battery. You can charge the battery while using the keyboard. Any 3.7V LiPo single cell battery should work with it, I used a 500mAh for my build.
All the manufacturing files and 3D print files are available on Github.
I don't understand why the CR2032 is so widespread among wireless keyboards. I ran my little keychain off one, and even with careful power considerations power draw was never below 5mAh. A larger MCU like an RP2040, STM family, or an AtMega looks more like 20mAh, even more with supporting circuitry / bluetooth.
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