I took a look at that $3 Charger link.
Looks just like something a friend loaned me a while back as a "battery desulfator". He said he'd loan in to me as long as I promised to to electricute myself, as it DOES USE 120V AC wall power.
I hadn't realized that the setup could be used on any voltage battery. I'll have to bust that thing out and test how many amps it draws. If it seems appropriate, maybe I'll try it somewhere out of the way with one of these cells and a fire extinguisher nearby...
