I've tried to stop the system battery notification chime as I found it a nuisance. Currently I use BatteryBot Pro and have alarms set with notifications but it doesnt override the system sound. I tried deleting the LowBattery.ogg file under system/media/ui and also switching it with another ogg file and rename it. Has anyone had any luck with this? Somehow I changed it on my first Droid the Motorola Droid X a few years back successfully. Thanks!