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  • Pro Micro uses the '32U4 processor? ww1.microchip.com/downloads/en/DeviceDoc/… Maximum Frequency – 8MHz at 2.7V - Industrial range – 16MHz at 4.5V - Industrial range - so you are operating out of spec with 16 MHz crysta;/resonator and 3.7V-4.2V LiPo battery. The '32U4 has a Selectable 2.56V ADC Reference Voltage, so you can use the Internal Aref voltage (vs the default External setting), divide down the battery voltage to be less than 2.56V max, and measure that way. Results may not be accurate if Vcc is < 5V with 16 Mhz clock. Commented Jan 2, 2020 at 14:03
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    But if I use a step up converter and a voltage divider I should be able to measure it? How do I have to wire it? Commented Jan 2, 2020 at 14:07