I've had the phone for 5 months now and it's never made a noise before when the battery was low, just the red LED blink/solid. Now it has started making this ghastly loud noise about every 15 minutes or so when the battery is very low. (I try to run it all the way down occasionally on the weekend to prevent memory) I can't even find a way to find this setting, much less change it. Is there something I'm missing or an app I need to find this notification and kill it or at least change it and it's volume? Thanks.