moedip, thanks for your info on the Battery Minder. I've since purchased the Battery Tender Plus and it's working great.

I didn't see anything about sulfation on the Battery Tender Plus's web site page, but the product packaging mentions it. It reads "Our "BTP micro-chip technology applies the correck peak charge, then automatically maintains the battery a the perfect float voltage which virtually ellimates battery destroying sulfation".

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Dave

1998 E320
2001 SLK320
2000 Lexus RX300