Canon EOS 5DS Instruction Manual page 447

If a battery communication error message is displayed, follow the
instructions in the message.
Registering Batteries to the Camera
You can register up to six LP-E6N/LP-E6 batteries to the camera. To
register multiple batteries to the camera, follow the procedure below for
each battery.
The battery cannot be registered if Battery Grip BG-E11 (sold separately)
using AA/R6 batteries is attached or the camera is powered by AC
Adapter Kit ACK-E6 (sold separately).
If six batteries are already registered, [Register] cannot be selected. To
delete unnecessary battery information, see page 449.
3 Checking the Battery Information
1
Press the <B> button.
With the battery info. screen
displayed, press the <B> button.
The battery history screen will
appear.
If the battery is not registered, it will
be grayed out.
2
Select [Register].
The confirmation dialog will appear.
3
Select [OK].
The battery will be registered and the
battery history screen will reappear.
The grayed out battery number will
now be displayed in white.
Press the <M> button. The battery
info. screen will reappear.
447