As I recall, they are DC only and 12 volt, but connecting a 9V battery should work.
You could also get a big 12v battery (Square kind) in the camping section because they are used for the big flashlights.
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The same products are at several Feed Stores.
I've been to most in my area.
I find them by searching Feed Store on Google Maps.
But I also know that the reflector / heat lamps can be had at Walmart or a hardware store (Lowes/Home Depot/ McCoys).
I'm willing to bet that a The Feeders...
I used this instructable to make my brooder: Brooder
I got feeder/drinker from Tractor Supply: Feeder / Drinker / Jar
But as my chicks got bigger, they kept knocking over the feeder/drinker, so I would have rather made drop feeders and get a drinker with a nipple like what is used here:Wall...