Thanks for the welcome.I looked on the Nikon site and found the pages for each of the batteries. According to the pictures, the EN-EL9 is 7.4 volts 1000mAh and the EN-EL9a is 7.2 volts 1080mAh.Whether that is enough to make a difference to the camera is the $64,000 question. I have submitted the question to Nikon support. When I get an answer, I will post the reply.Jay
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