Canon EOS 5D Mark III Instruction Manual (en)

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Charging the Battery
 
Upon purchase, the battery is not fully charged.
Recharge the battery before using.
 
Recharge the battery on the day before or on the day it is to be used.
Even during storage, a charged battery will gradually drain and lose its capacity.
 
After recharging the battery, detach it and disconnect the 
charger from the power outlet.
 
You can attach the cover in a different 
orientation to indicate whether the battery 
has been recharged or not.
If the battery has been recharged, attach the 
cover so that the battery-shaped hole <
> is 
aligned over the blue sticker on the battery. If the battery is 
exhausted, attach the cover in the opposite orientation.
 
When not using the camera, remove the battery.
If the battery is left in the camera for a prolonged period, a small amount 
of power current is released, resulting in excess discharge and shorter 
battery life. Store the battery with the protective cover attached. Storing 
the battery after it is fully charged can lower the battery’s performance.
 
The battery charger can also be used in foreign countries.
The battery charger is compatible with a 100 V AC to 240 V AC 50/60 Hz 
power source. If necessary, attach a commercially-available plug adapter for 
the respective country or region. Do not attach any portable voltage 
transformer to the battery charger. Doing so can damage the battery charger.
 
If the battery becomes exhausted quickly even after being fully 
charged, the battery has reached the end of its service life.
Check the battery’s recharge performance (p.344) and purchase a new battery.
Tips for Using the Battery and Charger
 
After disconnecting the charger’s power plug, do not touch the prongs for 
at least 10 sec.
 
If the battery’s remaining capacity (p.344) is 94% or higher, the battery 
will not be recharged.
 
The charger cannot charge any battery other than Battery Pack LP-E6/
LP-E6N.