Originally Posted by VinceU
Not a "cold forum member" but handy with WWW. Batteries when charged freeze at -77F. If 75% charged freeze at -37. Recommend do not use $20 trickle charger, will fry battery over long term. Use voltmeter or hydrometer method of checking. Charge when falls to 80% back to full. Full time charging as bad as no charging. Healthy cold battery will last up to a month before dropping much. Check out " car and Deep cyle batteries FAQ."
Hadn't realized there was a car and Deep cyle batteries FAQ. Shall check it out!