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Old 03-30-2015, 01:46 AM   #32
C lectric
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City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 4,414
Lead acid cells will freeze at different temps depending upon the state of charge so it is hard to answer specifically so here is Trojans chart. A fully charged battery would be tough to freeze but at half charge in many areas of the country a battery could be in trouble.

http://www.trojanbattery.com/pdf/WP_...orage_0512.pdf


http://www.lifelinebatteries.com/manual.pdf Page 22 shows freezing points for Lifeline AGM. It's better but is not immune.
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