A: I have used it all day taking upwards of 1000 photos - I don't shoot video so I can't say how long it will last shooting video. I do tend to turn my camera off when not shooting which helps extend the life of the battery.
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A: No, the EN-EL15 battery is not compatible with the Nikon D700 camera. According the official product manual, the D700 uses battery EN-EL3.
Here is a link to the product manual: http://download.nikonimglib.com/archive2/JCLag00oVq1V01uV7j850WxvZ217/D700_EU(En)04.pdf
A: No, the EN-EL15 battery is not compatible with the D80 camera. According to the official product manual, the D80 uses Nikon battery EN-EL3e.
A: Yes, the Nikon D7000 camera uses the Nikon EN-EL15 battery. This is documented on page 314 of the official product manual: