I posted about this elsewhere but I suppose I'll write about it here as well...
The AA pack that came with my scope died and honestly, I can't be bothered to deal with alkalines or AA cells in quantities this high. So I was trying to figure out another way to supply 12v in an easier to maintain manner.
Finally, I remembered that I had purchased this neat Milwaukee M12 widgit so I could charge my tools (slowly) with a phone charger when I go on travel.
It has a 12v output for use with the M12 heated jackets and other winter gear. It uses the same barrel plug as the telescope and both are center pin positive. I just had to find an old wall wart with the right plug and hack the two wires together with some solder and heatshrink.
This is perfect for me as I have a dozen or so M12 battery packs and the 6ah ones should last for days running that silly little fan. Also, the M12 packs should handle cold weather just fine.
There is also an M18 usb (phone charger) adapter that also has a 12v regulated output but I don't personally own that one.
Edited by prototype3a, 20 July 2020 - 11:01 PM.