I thought I would share my thoughts on the subject: The scarce availability of the EN-EL3e’s has had me, and I expect many of you, trying out NiMH AAs in their D200. Over the past couple of weeks I’ve been bouncing back and forth on which battery option to use as my primary power source. I’ve thought I might go with the NiMH AAs as I keep a stock of them charged for my flashes anyway, and they are of course much cheaper than the EN-EL3 route. However, my mind is made up that the way to go is with the EN-EL3es for the following reasons: - Two EN-EL3e batteries provide approximately 25% more energy (Watt-hours) than six 2500 mAh NiMH-AAs Where volts * Ah = Watt-hours: 2 each 1500 mAh EN-EL3e = 22.2 Watt-hours 6 each 2500 mAh NiMH-AA = 18.75 Watt-hours Swapping out an EN-EL3e is much cleaner and quicker than the AAs. I like the additional info the camera provides on the charge status of the two EN-EL3e’s, and the also the way the camera uses them sequentially. It removes some of the guess work on where you stand with your battery power. Case in point: this weekend I made a trip out to my local bird blind. I had the battery grip loaded with NiMH AAs that I had put in the day before. I quick check of the battery meter on the LED showed slightly less than full charge. I made the decision to take along an EN-EL3e instead of a half dozen AAs as my backup. Ten minutes into my birding journey I was surprised when the shutter wouldn’t fire due to low battery power. I pulled the spent AAs out and dropped in the EN-EL3e and remember thinking how quick and easy that was compared to the alternative of messing with swapping the AAs out in and out of the MS-D200 cartridge in the field. Comments anyone?