What is the best way to obtain the battery voltage when the cube cell ab01 is being powered by the 3.3v pin?
Get voltage cube cell ab01 pin 3.3v
I assume you do not connect the battery to the board and using an external battery and DCDC/LDO powered the board via 3.3V.
Details:
https://heltec-automation-docs.readthedocs.io/en/latest/cubecell/frequently_asked_questions.html
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It is exactly this scenario you spoke. Thank you very much for the reply and help.