I can charge my device (SA3CNT) completely, totally shut it down, turn it on 8 to 10 hours later to find the battery completely drained. I have wifi, bluetooth radio, and any media players turned off. When I check "Battery use" in Settings, "Device Standby" is the #1 battery user by far -- it is more than everything else put together, including "Display" I installed "Juice Defender" but saw no improvement. What gives? What is "Device Standby", and how can I reduce its battery usage?