Canon EOS 6D Instruction Manual page 357

The access lamp still blinks even when the power switch is set to <2>.
If the power is turned off while an image is being recorded to the
card, the access lamp will remain on/continue to blink for a few
seconds. When the image recording is completed, the power will
turn off automatically.
The battery becomes exhausted quickly.
Use a fully-charged battery pack (p.28).
The battery performance may have degraded. See [54: Battery
info.] to check the battery's recharge performance level (p.334). If
the battery performance is poor, replace the battery pack with a
new one.
The number of possible shots will decrease with any of the
following operations:
• Pressing the shutter button halfway for a prolonged period.
• Often activating only the AF without taking a picture.
• Using the lens' Image Stabilizer.
• Using the LCD monitor often.
• Continuing Live View shooting or movie shooting for a prolonged
period.
• The Eye-Fi card's transmission is enabled.
• GPS is enabled.
The camera turns off by itself.
Auto power off is in effect. If you do not want auto power off to take
effect, set [52: Auto power off] to [Disable] (p.55).
Even if [52: Auto power off] is set to [Disable], the LCD monitor
will still turn off after the camera is left idle for 30 min. (The
camera's power does not turn off.)
Troubleshooting Guide
357