Components
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Charging Module: AliExpress Link
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Pins: AliExpress Link
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Build
WARNING, This is wired based on a Redox Li-Po. Other brands could have it wired differently
Place the 3 pin XH2.54 Male connector on the center 3 holes, Make sure the side with the 2 slits are facing the USB-C, Flush Cut them to the PCB, and solder them. Sand down the side with the newly added connector just ever so slightly, but it might fit just as it. Fit it in the case, and it sound pop together and be nice and snug.
note, with the module you use, you can also make it charge 3S Batteries, but this case wont fit it, If needed, I might make one for 3s, but not planned as of now.