Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 484)

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You can check the conditions of the battery you are using on the LCD
monitor.
Select [Battery info.].
Under the [ 5 3 ] tab, select [ Battery
info. ], then press < 0 >.
3
Checking the Battery Information
The model of the battery or household
power source accessory (sold separately)
being used is displayed.
The battery level indicator (p.54) is
displayed together with the remaining
battery level in 1% increments.
The number of shots taken with the current
battery. The number is reset when the
battery is recharged (p.42).
Battery’s recharge performance level is
displayed in three levels.
(Green): Battery’s recharge
performance is fine.
(Green): Battery’s recharge
performance is slightly
degraded.
(Red): Purchasing a new battery is
recommended.
Using genuine Canon Battery Pack LP-E19 or LP-E4N/LP-E4 is
recommended. If you use batteries that are not genuine Canon products, the
camera’s full performance may not be attained or malfunction may result.
The shutter count is the number of still photos taken. (Movie shooting is
not counted.)
If [ Calibration is recommended when charging battery next time ] is
displayed, see page 45.
If a battery communication error message is displayed, follow the message.