Posted by Willy-N [108.162.216.23] on Thursday, January 21, 2016 at 10:52:09 :
In Reply to: Be careful Frozen batteries. posted by The Dodge Boys [173.245.56.60] on Thursday, January 21, 2016 at 07:02:41 :
This explains it more on what to do and why.
If the temperature has dropped below 20 degrees F (-6.7 degrees C), insure that the electrolyte is NOT frozen in the dead battery. If frozen, do NOT jump or boost the battery if the case is cracked or until the battery has been full thawed out, recharged, tested. When electrolyte freezes, it expands and damage the plates or plate separators, which can cause the plates to warp and short out or the case to crack. When the battery is frozen, the best solution is to temporarily substitute a fully charged battery for frozen one or tow the vehicle to a heated garage. With any completely dead (or flat) battery, cell reversal can occur. The electrolyte in a dead battery will freeze at approximately 20°F (-6.7°C). The freezing point of a battery is determined by the State of Charge and the higher it is, the lower the freezing temperature. If the battery has been sitting for several months and frozen, then the battery has probably sulfated as well. If the battery has been sitting for several hours and frozen, then the problem is either an excessive parasitic load like leaving the headlights on or a faulty charging system.
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