Corrosion on terminal

[Lux]

Yeah you're right, grease has worked fine for many years, but it's no longer a suitable all-inclusive, end-all solution to corrosion.

Many vehicles have a battery condition sensor integrated into one of the terminals and, for them, grease would not advisable.

I had a car come in with a burning smell and erratic fault lamps among other electrical gremlins. That battery sensor on the terminal suffered an internal malfunction from a manufacturer error, causing high impedence and arcing. I last measured the terminal's temperature at 226 degrees centigrade with my calibrated infrared pyrometer, and it was continuing to soar.

Had that car's terminals been coated with grease, it might have been on the news instead of my hoist.