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Message: <blockquote data-quote="GracieAllen" data-source="post: 517160" data-attributes="member: 41283">ABSOLUTELY!  I don't recall EVER seeing anything in the D810 manual (and I just did a search through the pdf) that would lead me to believe that if I have batteries in the grip and they get low, that the camera will exhibit undesirable behavior.  As I said originally, I VAGUELY remember a discussion in a different forum complaining about the D8xx doing something of that sort, but I suspect it came up because the D8xx goes about 7-800 shots (at least mine does), on an EN-EL18 in the grip...  And now that I think about it, I was shooting focus stacks, which use the live view feeding a tablet, so the drain is huge, and when the batteries in the grip got low, mine just locked up.  It DID NOT use the battery in the body at all.  It got low and the shutter locked.  I pulled the EN-EL18 battery carrier out and shoved in one with 8-Eneloops and things were fine.I've done airshows with the D810, and put 3000 shots through it during a show (usually 3 days), using the review part of the time, which will take me through the EN-EL18 and a set of Eneloops, and into the second.  Nikon (if I recall correctly) claims around 2400 shots from an EN-EL15 and 3400? from an EN-EL18, but I've never gotten close to that with either.  I've never weight it, but I suspect the Eneloop AAs weigh a couple ounces more than the EN-EL18, but they seem to go at least as long (actually longer), and they're cheaper than Nikon EN-EL18 batteries.  And considering I'm shooting handheld with a D810, battery grip, and a Sigma 50-500 OS lens, a combination that weighs just over seven pounds, a couple ounces isn't gonna make ANY difference at the end of the day!And watch out for the 3rd party EN-EL18s...  Some will work fine, some aren't so good.</blockquote>

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