The ITE 312 battery has this:
Everyday use
Seamless connectivity
“Enjoy a wealth of connectivity opportunities, like streaming music, talking on the phone and using Oticon ON app to control the hearing aids. Bluetooth wireless technology makes it all possible.
Hands-free communication
Make hands-free calls by streaming the sound from your phone or other device directly to your hearing aids, using the microphones in the hearing aids to capture your voice.”
The CIC #10 battery does not have streaming, and would not be able to be fitted or programmed remotely. It will not have the ON app.
The ITE size 312 battery will have remote programming ability and have the ON app.