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My experience is limited to the one I have been using for a couple of years https://uk.jackery.com/products/explorer-240-portable-power-station: goes all night even in bitter cold, recharges in a couple of hours from my off-grid solar inverter. I chose this one because a saw a comparison review of half a dozen or so, and this had the most consistent output voltage. A quick search suggests similar battery packs are widely available. Where have you been looking?
I also have been bemoaning the dearth of clear skies this year here in north Essex (as family and friends can testify!). However, I took a sideways view. I had been using an astro modified DSLR but was gifted an ASI585MC for Christmas and began using that for gathering Lunar images, when possible, which takes far less clear sky time than do DSOs – a whole new interest for me. And having observed that it was often clear all day then cloudy as soon as darkness fell, I also bought a solar filter for my Newtonian reflector, and started imaging the Sun, which also needs only a few clear minutes – another new interest. Every cloud has a silver lining, I suppose . . .
Stan, file a report here: https://ukmon.imo.net/members/imo/report_intro
[EDIT] Previous reply was written while I was typing this] I’d also be interested in the answer. I use a Nikon D750 DSLR, which reportedly has a Sony IMX-128-(L)-AQP CMOS sensor. I usually shoot about 30 dark frames at the same exposure as my lights. I also shoot about 30 each Flats and Dark Flats. I have never bothered with Bias frames. I stack with AstroPixelProcessor which creates Masters from the calibration frames. I was just reading a long thread on Astrobin on the whole subject – in which various people announce, with what sounds like great authority … completely contradictory things.
Surely there must be a thorough scientific explanation somewhere that everyone can agree on?
By chance I photographed M101 on 2023 April 20, and had a go at it again last night, May 20. My processing isn’t particularly consistent but the earlier absence is clear.
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