Posts: 2752
Location: Mauston, Wisconsin | TJ's right; if it froze, it was not fully charged, it's probably toast. I would be very careful if trying to recharge it and load test the battery. The charging process generates hydrogen gas internal to the battery. If there is a cracked plate connector or inner cell weld, you could get a spark and a explosion.
A fully charged lead-acid battery can handle -92F. When a battery is discharged the specific gravity of the electrolyte changes because the ratio of water (H20) and sulphuric acid has been changed by the discharge process electro-chemistry. This effectively raises the freezing point of the electrolyte. If the battery is discharged to zero volts- the electrolyte is almost pure water. Check out the electrolyte freezing points on page #4 of 8 in this Trojan Deep Cycle Battery Mainetenance Manual. There is lot's of valuable information in this document.
http://www.backwoodssolar.com/newsletter/pdf/Trojan%20Deep%20Cycle%...
Have fun!
Al
"My advice to anglers who hold fish up vertically by the gills is to eat it." Dr. Colin Attwood, Sea Fisheries Research Institute, Roggebaai, South Africa.
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