To remove the battery, turn the camera off and open the battery-chamber/memory card slot cover. Press the battery latch in the direction shown by the arrow to release the battery and then remove the battery by hand.
After confirming that the memory card access lamp is off, turn the camera off and open the battery-chamber/memory card slot cover. Press the memory card in to eject it (q), and pull it out to remove it (w).
The camera uses a standby timer to help reduce the drain on the battery. If no operations are performed for about 30 seconds, the standby timer will expire and the monitor, viewfinder, and control panel will turn off. A few seconds prior to turning off, the displays will dim. They can be reactivated by pressing the shutter-release button halfway. The length of time before the standby timer expires automatically can be selected using Custom Setting c3 [Power off delay] > [Standby timer].