I went to an authorized reseller, but they gave me this charger for my Raspberry Pi 3B. I used Etcher to write the August 2020 version of RPi OS to the SD card and it boots fine. However, during boot it shows the yellow lightning icon (it would've been great if it showed the value of the voltage along with the icon). I've seen the FAQ and answers like this, this and this.
One of the comments on this page encourages the user to try running the Pi anyway.
What I'm currently connecting to the Pi when it boots:
- HDMI cable for the monitor.
- Ordinary 104 key keyboard.
- Ordinary laptop mouse.
Before going to the store to replace the charger with the official RPi power supply adapter, I need to check if a 2.1W speaker and a USB mic will work with my Pi. After the Pi boots up, if I disconnect the keyboard and plug in the speaker to the 3.5mm jack and the USB port and I connect the USB microphone to another USB port, would it be safe? A friend said USB ports have an auto-shutoff for safety. Is it safe to try it this way? I assume the SD card can get corrupted only if there is low voltage during startup or shutdown, correct?