27
state of charge of a battery.
•
In winter conditions, the battery must be fully charged to prevent the pos-
sibility of freezing. A fully charged battery will not freeze in temperatures
above -75° F (-60° C). Although the chemical reaction is slowed in cold
temperatures, the battery must be stored fully charged, and disconnected
from any circuit that could discharge the battery. For portable chargers,
disconnect the charging plug from the vehicle receptacle. The batteries
must be cleaned and all deposits neutralized and removed from the bat-
tery case to prevent self discharge. The batteries should be tested or re-
charged at thirty day minimum intervals.
•
Periods of inactivity can be extremely harmful to lead acid batteries. When
placing a battery into storage, follow the recommendations below to in-
sure that the battery remains healthy and ready for use.
The most important things to avoid:
•
Freezing:
Avoid locations where freezing temperature is expected. Keeping
a battery at a high state of charge will also prevent freezing. (See following
table.) 31
•
Heat:
Avoid direct exposure to heat sources, such as radiators or space
heaters. Temperatures above 80°F accelerate the battery's self-discharge
characteristics.
Storage Procedure
1. Completely charge the battery before storing.
2. Store the battery in a cool, dry location, protected from the elements.
3. During storage, monitor the specific gravity (flooded) or voltage. Batteries
in storage should be given a boost charge when they show a 70% charge or
less. See Table 1 in the Testing Section.
4. Completely charge the battery before re-activating.
5. For optimum performance, equalize the batteries (flooded) before putting
them back into service. Refer to the Equalizing section for this procedure.
Electrolyte Freezing Point at Various States of Charge
Specific Gravity (g/cm³)
State of Charge
Freezing Temperature
1.28
100%
-68.9
1.265
92%
-57.4
1.25
85%
-52.2
1.2
62%
-26.7
1.15
40%
-15
1.1
20%
-7.2
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