Quote Originally Posted by SeaRay View Post
The amount of charge in lead acid batteries is a function of the specific gravity of the fluid in the battery. Pulling this out of the cobwebs in back of my mind but I believe the specific gravity of water is 1. When fully charged the SG of a battery is around 1.125. The more fully discharged a battery becomes the more like water the solution becomes. So a "dead" battery could freeze and burst just like a hose or spigot left unprotected.
Because we don't get a lot of " pipe busting" cold in SC batteries don't often freeze and burst.
Leaving a battery on a smart charger full time is the best insurance against freezing plus it's best to keep fully charged anyway to avoid sulfation of cells.

More than you wanted to know, right? Engineer's curse.
JUST TELL ME WHAT TO DO!!Battery freezing? Battery freezing?

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