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I answered your question on this other discussion...you want the 1.25 amp BATTERY TENDER PLUS.
There is another option called the CTEK MULTI US 3300 which might also interest you. Stay with a float maintenance charger of no more than 1.25 amp with the OPTIMA battery. http://forums.corvetteforum.com/show....php?t=1494206
Last edited by hotwheels57; Sep 8, 2006 at 07:00 PM.
Also, the Optima web site lists charging info/requirements. Following is the charging info on the Red Top (For the battery tender, see Float Charge info):