Battery Tender Junior on sale..

UOP said

Not trying to start an argument, but this is also a good one for the price. I use these because they're weather proof and come with a bracket that lets the battery hold it in place for a semi permenant install. Once installed all you have to do plug in an extension cord.

Schumacher SE-1-12S-CA Fully Automatic Onboard Battery Charger - 1.5 Amps : Amazon.com : Automotive

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I'm not sure I would want to permanently mount the charger itself, since that would limit its use to one vehicle. I have one like Joe referred to, it comes with a pigtail that you permanently mount to your battery. When you want to connect it, just plug it in. They sell extra pigtails to install on your other batteries... Just move the charger to another battery when desired. Why did you insist on starting this argument?