I use these to keep our farming equipment's batteries charged as some parts can take days (or longer) between uses. A tractor has several on-board computer modules that constantly consume a small amount of energy. This charger has worked very well for all of them. The only problem was that I forgot to take it off and drove into a frozen field - it fell and I drove over it. Not the charger's fault, just a dumb case! I've ordered two more!
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