Canon EOS 6D Instruction Manual page 335

Registering the Battery to the Camera
You can register up to six LP-E6 battery packs to the camera. To
register multiple battery packs to the camera, do the procedure below
for each battery pack.
Battery registration is not possible if size-AA/LR6 batteries are in Battery
Grip BG-E13 or if you use AC Adapter Kit ACK-E6.
If six battery packs have already been registered, [Register] cannot be
selected. To delete unnecessary battery information, see page 337.
3 Checking the Battery Information
Press the <B> button.
1
With the battery info. screen
displayed, press the <B> button.
The battery history screen will
appear.
If the battery has not been registered,
it will be grayed out.
Select [Register].
2
Select [Register], then press <0>.
The confirmation dialog will appear.
Select [OK].
3
Select [OK], then press <0>.
The battery pack will be registered,
and the battery history screen will
reappear.
The grayed-out battery number will
now be displayed in white letters.
Press the <M> button. The
battery info. screen will reappear.
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