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Message: <blockquote data-quote="RocketCowboy" data-source="post: 528784" data-attributes="member: 25095">Howdy Victor and welcome to Nikonites.It is true that there's an internal battery for keeping the clock and settings stored. The camera won't operate off this internal power supply alone, but it does preserve the camera through battery changes, etc. The internal battery is charged from the external battery or external power adapter, but even if it's dead it should not prevent the camera from powering up. In fact, you should get an error indicating that the internal battery is faulty, from what I recall.It could be possible that it's the battery contacts within the camera that are dirty and preventing the battery pack from making a good contact. Does the camera body turn on and provide any kind of error information, or it just sits as though there is no power available?</blockquote>