Nikon D300 User Manual page 480

Figure 5-26. Picture of a genuine EN-EL3e battery
Using an MB-D10 Battery Pack
If you are using the MB-D10 battery pack with an EN-EL4a
battery or the EN-EL4 battery pack (not EN-EL3e), the
Battery info screen will also show calibration information.
Calibration is optional, but it could be required after many
charge/discharge cycles so that the Battery info screen will
present accurate information.
The battery charger (MH-18A) for the Nikon D300(S) does
not have a calibration feature, so many D300(S) users will
have little knowledge of it. The battery charger (MH-21 and
MH-22) for the EN-EL4 and EN-EL4a battery does have
calibration. If you also use a Nikon D2- or D3-level camera,
you will be familiar with it.
The Battery info screen will change the amount of
information it displays to a significant degree according to
whether you have an MB-D10 battery pack mounted and
what type of batteries are being used in the pack.
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