diydrones/ardupilot — pull request #522 by chapman (2013-08-29 07:31:31+00:00)
Title: disable low battery buzzer if usb connected

Disable low battery piezo buzzer if usb connected: there was a comment here saying it should only activate if a battery is connected, but it wasn't actually doing the check. Super annoying to have the loud piezo buzzer go off when you're tethered to download logs!