Lesson 2/Learning Event 2
Freezing point, degrees Fahrenheit
If the battery electrolyte does freeze, the ice forces active material from the plates and can crack
plates and containers or buckle plates and break separators. If you try to charge a frozen battery,
the grids expand and shed active material. Let a frozen battery thaw out in a room at normal
temperature before charging. The battery may be saved if freezing has not already caused too
If water is added to a battery, it may freeze if it is not immediately mixed with the electrolyte. For
this reason, do not add water in freezing temperatures unless the battery is indoors or the vehicle is
operated for at least an hour after the water is added.
The high temperatures found in the tropics create special maintenance problems that you will have
to adjust to if you are assigned in one of those areas.
Rapid evaporation of the water will result due to the heat, so keep a close watch on the electrolyte
level. Every effort should be made to keep the battery compartment as cool as possible during and
after operation. Do not obstruct ventilation holes, or the heat will damage the batteries.
At high temperatures, the acid in the electrolyte is more active, so using a weaker solution will give
good results and cause less damage to the plates and separators.