Do Android phones tell the charger if the battery is low?

I'm trying to find out if an Android phone with a mini USB plug (say for example my Galaxy S3) send any kind of signal or voltage reading that indicates if my battery is low. The reason I'm asking is because I want to make a device that beeps and flashes a light when the battery is low, or drained completely. My phone does not make sound obviously when it's battery is discharged completely. A scenario would be I plug in the phone to charge it in my room, then I go watch TV. The phone for some reason uses too much power when wifi is on, so I forget to turn off wifi and my battery doesn't get charged, but drains slowly instead. I would like to prevent this by having a device that reads the voltage of the phone, then beeps, and flashes a red LED light when the battery is low.