Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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If a problem occurs with the camera, first consult this Troubleshooting 
Guide. If this Troubleshooting Guide does not resolve the problem, 
contact your dealer or nearest Canon Service Center.
 
If the battery’s remaining capacity is 94% or higher, the battery will 
not be recharged (p.526).
 
Do not use any battery other than genuine Canon Battery Pack 
LP-E6N/LP-E6.
 
If (1) the battery charger or battery has a problem or (2) 
communication with the battery failed (with a non-Canon battery 
pack), the protection circuit will stop charging, and the charge 
lamp will blink in orange at a high speed. In the case of (1), unplug 
the charger’s power plug from the power outlet. Detach and 
reattach the battery to the charger. Wait a few minutes, then 
reconnect the power plug to the power outlet. If the problem 
persists, contact your dealer or nearest Canon Service Center.
 
If the internal temperature of the battery attached to the charger is 
high, the charger will not charge the battery for safety reasons (lamp 
off). During charging, if the battery’s temperature becomes high for 
any reason, charging will stop automatically (lamp blinks). When the 
battery temperature goes down, charging will resume automatically.
 
Make sure the battery compartment cover is closed (p.44).
 
Make sure the battery is installed properly in the camera (p.44).
 
Recharge the battery (p.42).
 
Make sure the card slot cover is closed (p.45).
Troubleshooting Guide
Power-Related Problems
The battery does not recharge.
The charger’s lamp blinks at high speed.
The charger’s lamp does not blink.
The camera is not activated even when the power switch is set to <1>.