Hi there,
I would suggest you keep all your questions in one thread, It is all pertaining to the Xiao and you need to keep track, many have already been answered, you the search icon up top and ask any questions you may have lots of experienced smart folks on here willing to help.
If you have a code question please post it using the Code tags above also </> just past it in there.
I have several battery examples on here and the schematics are always available on the wiki’s for the different Xiao’s the battery charge/management chips vary from model to model so be mindful of charge currents and always use a battery with Over/Under SOC protection.
HTH
GL 
PJ 
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