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Message: <blockquote data-quote="hark" data-source="post: 635294" data-attributes="member: 13196">I don't have a D500 so can't give you any firsthand advice; however, when I went to clean the sensor on my former D600, I couldn't get the mirror to lock up. The battery was almost at 50%. I even asked on here about it. Then when looking through the camera manual, I read where there needs to be at least a 50% battery charge, or it won't lock up. My guess is the D500 uses more RAM than lesser powerful Nikon bodies. And the discrepancy between your battery having 5% vs lokatz's 1% might have more to do with differences in settings between your camera body and his/hers. My guess is some settings may require more RAM than others--size of your RAW files, whether you're in manual mode, aperture, or shutter priority, etc might play into how much usable power is really available.</blockquote>