I have always used vasoline.  Grease is good also, but a bit more messy.  They definitely help with corrosion.  Semi truck electrical components such as taillights have grease fittings on them, so its a known and proven benefit.

dr

Kevin Mulligan <mulligan_kevin@YAHOO.COM> wrote:

>
>Stupid question, I know, but in the past I've seen
>batteries that 1) had their terminals greased
>(Vaseline?), 2) had the connection spray-coated with
>some sort of clear lacquer-like substance (I even
>bought some of this stuff once, but was later told it
>would do more harm than good), and 3) had no grease or
>coating, but simply a felt washer placed on the
>terminals before connecting the battery leads.

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