Battery 7V vs AC Adapter 9V

Mak

New member
Recently I shot a lot of indoor video with D800. Decided to buy an AC adapter.
Surprisingly I found that AC adapter has 9V output. The battery has only 7V.
The EP-5B (dummy battery) of the adapter inserts to the battery-chamber.
So, both of them, AC adapter and battery use one connector. But one of them provides 9V and the other 7V.


Could somebody explain this?

 
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