I can recommend the one I bought when I had battery troubles:  
 
http://www.blackanddecker.com/ProductGuide/Product-Details.aspx?ProductID=15572
 
Less than $20.Ellen
Lola, '85 Vanagon ASI> Date: Wed, 19 Dec 2007 17:15:35 -0900> From: colorworks@GCI.NET> Subject: Battery chargers> To: vanagon@GERRY.VANAGON.COM> > Hi folks:> > I'm about to move my Westy outside for the winter, and would prefer to not have to remove the batteries as they're such a royal pain to put back in. I have one of the Odyssey gel batteries, as well as a standard battery as the main. I've got a switch so that I can link the two together very easily. So, question is is there a battery charger that can be used for both gel and regular batteries that is small enough to mount say under the sink? Looking for something that I can just leave plugged in, and it will keep the batteries charged and ready to go.> > This is one I was looking at http://www.batterystuff.com/battery-chargers/brands/chargetek/CT-500-1.html, but maybe there's a cheaper alternative.> > TIA,> > Troy
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