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I use to buy them by the case at Harbor Freight Tools to give away to my customers when I owned a battery co. Buy a battery and get a free "maintainer"!!!. The ones with the direct hook up to the terminal with a disconnect are a little more "sure" that the cig lighter style. I use to pay about $2 - 3 dollars each. They are also called "float chargers" Sold that company in 03 and I am sure the price is up a bit now.
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