Hi. I have a Pro Micro (5V) and with the 5 volts needed, there comes a lot of problems. I think a possible answer would be to modify the board and remove the 5 volt regulator, like what @Cheungbx did with his Ardubaby (great creation by the way!) but I don’t have enough guts to modify and possibly destroy my 30$ Arduino. I did buy a 3.7v lipo charger (the Adafruit Micro Lipo) but it doesn’t boost the voltage. Instead, I thought I would save some money by just buying a boost module. Paired with the charger. I has no idea how I would connect the two unfortunately, I’m not an expert at this kind of stuff. Here’s the booster and here’s the charger:
Thanks for the help!