Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 43)

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Charging the Battery
Upon purchase, the battery is not fully charged.
Charge the battery before use.
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.
When not using the battery and charger, attach the protective covers
provided.
Use the battery in an ambient temperature range of 0°C - 45°C /
32°F - 113°F.
To attain best battery performance, an ambient temperature of 10°C
- 30°C / 50°F - 86°F is recommended. In low temperatures, battery
performance and operation time of the camera may temporarily
decrease.
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 when it is fully charged may lower the
battery’s performance.
Tips for Using the Battery and Charger
To charge the provided Battery Pack LP-E19, use the provided Battery
Charger LC-E19. Battery Pack LP-E19 cannot be charged with Battery
Charger LC-E4N/LC-E4.
Provided Battery Charger LC-E19 can only charge provided Battery
Pack LP-E19 and Battery Pack LP-E4N/LP-E4.
Depending on the battery’s condition, it may not reach a 100% charge.