I have worked in component level electronic repair since the early 90's. After doing a bunch of reading here and elsewhere I thought of the idea of both removing the microphone capsules from a Sony PCM-A10 and installing a 12 volt battery in the area previously occupying that space. Unfortunately, due to a spinal cord injury I was unable to complete the mod which would have put a 12v battery with modifications in place of the removed microphones, enabling a person to plug in a pair of CA14's and have an onboard battery box.
I will be adding some additional internal pictures of the circuit boards and where and how the microphones are wired and mounted as soon as i can do a proper search of my hard drives.