Nikon D6 Reference Manual page 1178

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Using camera Ethernet, Wi-Fi (wireless LAN), and Bluetooth
features
•
Using the built-in GNSS receiver
•
Using the camera with optional accessories connected
•
Using VR (vibration reduction) with VR lenses
•
Repeatedly zooming in and out with AF-P lenses
To ensure that you get the most from rechargeable Nikon
EN-EL18c batteries:
•
Keep the battery contacts clean. Soiled contacts can reduce
battery performance.
•
Use batteries immediately after charging. Batteries will lose
their charge if left unused.
•
Check the condition of the battery regularly using the
[Battery info] option in the setup menu. If a j icon appears
in the [Calibration] field, calibrate the battery in the MH-26a
battery charger ( 0 1114). If the battery has not been used for
more than six months, recharge the battery when calibration
is complete.
1126 Battery Endurance