Nikon D90 - Manual (Page 228)

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Battery Info
View information on the battery currently inserted in the
camera (if the camera is powered by an optional MB-D80
battery pack containing two EN-EL3e batteries, information for
each battery will be listed separately; only the battery level is
displayed when AA batteries are used).
GPS
Adjust settings for connection to a GPS unit (pg. 124).
Eye-Fi Upload
This option is displayed only when one of the following 2GB Eye-Fi memory cards
(available separately from third-party suppliers) is inserted in the camera: Eye-Fi Card,
Eye-Fi Home, Eye-Fi Share, and Eye-Fi Explore (at the time of writing, Eye-Fi memory
cards were approved for use in the United States of America only; be sure that Eye-Fi
card firmware has been updated to the latest version). Choose Enable to upload
JPEG images taken with the camera to a preselected destination.
Note that pictures will not be uploaded if signal strength is insufficient. Choose
Disable where wireless devices are prohibited.
Firmware Version
View the current camera firmware version.
Item Description
Bat. meter The current battery level expressed as a percentage.
Pic. meter
The number of times the shutter has been released with the current battery since
the battery was last charged. Note that the camera may sometimes release the
shutter without recording a photograph, for example when measuring preset
white balance.
Battery
age
A five-level display showing battery age. 0 ( k) indicates that battery
performance is unimpaired, 4 ( l) that the battery has reached the end of its
charging life and should be replaced. Note that batteries charged at
temperatures under about 5 °C (41 °F) may show a temporary drop in charging
life; the charging life display will however return to normal once the battery has
been recharged at a temperature of about 20 °C (68 °F) or higher.