Yep, they should look like a small motorcycle/lawn mower battery, sealed.
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Look for markings Pb . Most of them will be lead batteries.
I was told yesterday that this guy has a lot of electronic stuff for me and I'm not too sure what kind of electronic stuff it is. (Hopefully computer related boards and other things) But, I should be getting a load about the same size of stuff from him every Monday and Friday. So we shall see what happens! Really excited!