Seeeduino XIAO with 3.7V LI-PO Battery: Display voltage

Products & Technology XIAO
3

I have 3 points of concern.

  1. When a XIAO is connected to a PC USB port, does this mean that a battery will be charged directly by USB 5V? If so, it is dangerous. It is recommended to connect a battery and a XIAO via a Schottky diode.
  2. Since 3.7V Li-PO battery can be charged up to 4.2V, it is recommended to set R2=33k.
  3. If a battery voltage drops below about 3.5V, the AD conversion value will be inaccurate.
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