From shooters who've tested the a9
Brian Smith: http://briansmith.com/sony-a9-camera-fe ... ns-review/
After my first day of shooting, my battery still had 30% juice left in the tank after shooting OVER TWO THOUSAND continuous focus action shots with a mix of E-mount and adapted A-mount lenses.
NP-FZ100 performed even better on second day of shooting with 60% battery remaining after shooting over 1400 action and portrait shots.
Patrick Murphy-Racey: https://www.youtube.com/watch?v=TQnj4Pt8F6k&t=2357s
I purposefully did not charge the battery each day and instead just kept shooting on the same one so I could see how many exposures I could get.
I shot on Monday, Tuesday, and Wednesday morning and into the early afternoon each day.
That Wed. night, we took the cameras to the University of Hawaii (Much thanks to Jay Metzger for his kind welcome!!!) to shoot a bunch of different sports with various types of action.
At the end of Wed. night, I had shot a total of 3867 images on the main camera that was used on the 500mm f/4 + LEA3 combination.
The final readout on battery #1 in the grip read, 59%. It never even touched battery #2 which just sat in there doing nothing the whole week.
Even the engineers were impressed with this performance in the hands of this “end user.” It achieved this percentage doing the most heavy lifting possible, moving the huge elements of glass around in the 500mm A mount lens though the phase detect enabled Sony LEA3 adapter! Impressive. Likewise, the other A9 I was using had the GM70-200mm f/2.8 attached with the 1.4x as well. I shot around 2300 photos on that setup and the battery level read 81%.