On Jan 20, 10:25*am, Boden wrote:
B'razeer Boobar wrote:
Past couple of years I didn't remove the sealed battery from the lawn
tractor which is kept in a detached garage. *Winter temp in the garage
never dropped to 32F due to mild winters. *There were no problems the
following springs. *If the temp does go below 32 for a sustained
period, does this necessarily cause irreparable damage to the battery?

Until the electrolyte freezes no damage will occur. *When it freezes it
can cause the case to crack and leak, and possibly damage the interior
elements. *Battery acid, depending on the state of charge, won't freeze
until it drops to -25 to -30 degrees F

A fully charged battery wont freeze until -75 a discharged battery
will freeze at 27 and it will sulfate and ruin the battery, with car
electronics and dirt on the battery they self dischage so the freeze
point goes up.