There are a lot of very good tenders/maintainers on the market today. I personally like and use Deltran Battery Tenders. They have a great reputation, are very reasonably priced and can be purchased at just about any auto parts store or from any number of on-line sources. Have used a Battery Tender Plus on my Corvette for years and it has worked great. Recently replaced it with a Battery Tender 800 and the Plus will now be used on the Camaro when we take long trips in our CUV.
