Correct Battery Charger?

  mercedes/s-class/2000-2006

I am looking to purchase a quality battery charger. A year-old battery in a 2002 S-class vehicle that does not get much use and is now in frigid cold weather and won't turn over. Your advice is to obtain a 1.5 or 2 amp trickle charger. I followed your link to Amazon's list of chargers and I like the Battery Tender Plus but it is 1.25 amps. Will this charger work for my battery? If not, is there a specific one you can recommend? I am getting bug eyed looking at all the available battery chargers. Thank you!

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