[johnnylambada]

Several folks have stated that it could be just an app. I disagree. Modern versions of Android on a real phone severely limit what an app can do. It can't run forever, it can't gather any and all telemetry available to the physical device at will.

As for battery life, there's a lot you can do at the OS layer to limit what services run, but at the end of the day you're not running on a piece of hardware that has been honed by thousands of engineering hours and billions of dollars, so V1 is going to be pretty rough.