There are 3 microphones. They are 3 silver chips on one side, above through holes corresponding to rubber gasket things on the other side.
the mics are soldered onto the main board. also the device is primarily voice controlled so that would render it pretty much nonfunctional.
no, I’m afraid I don’t know much about battery circuitry. there is not much free space inside this little puck to hold a battery with significant capacity, though.
@alexa3 the power supply is marked 14V / 1.1A
@hk_asking The switch is on a small peripheral board connected by a ribbon cable. I cannot tell if it directly disconnects the microphone.
The NAND flash is TC58NVG2S0H
The SoC is Synaptics AS-370 A1
RAM is NT5CC128M16JR
The entire markings on each chip are:
NT5CC128M16JR-EK[there's more letters but they're covered]
92420800EP L T[there's more letters but they're covered]