3.11 SPECIFIC GRAVITY TEST
It is possible to determine a battery's ability to perform by measuring the specific gravity (sp. gr.) of each
cell with a hydrometer. This is the best method to determine a defective battery.
The hydrometer readings indicate two things:
State of Charge - The amount of electrical power stored in the battery.
Condition - The ability of battery to store and deliver power.
NOTICE: Batteries should be fully charged before performing specific gravity tests to determine
battery condition. Hydrometer tests of batteries not fully charged are misleading and
inconclusive.
There are different type hydrometers. Carefully read and follow the instructions supplied with your
hydrometer.
3.12 TPS FOR PROLONGING BATTERY LIFE
To prolong battery life, recharge batteries as soon as they become 20% or more discharged (less than
1.238 sp. gr.). Batteries may be recharged if vehicle has been driven 15 minutes or more since the
previous charge.
Do not allow batteries to fall below 80% discharge (1.098 sp. gr.). Deep discharging significantly reduces
battery life. Opportunity charging during breaks or shift change can be used to extend range but always
complete a full charge cycle at least once a day.
If the vehicle is not operated daily the Power keyswitch should be turned off. This will reduce power loss
on the batteries.
Batteries in storage may self discharge and should be recharged when the specific gravity falls below
1.238 sp. gr.
NOTICE: Specific gravity readings are at 80
0
F. Values need adjustment for electrolyte
temperature. Reduce .004 for every 10
0
F below 80
0
F. Increase by that amount for every 10
0
F
above
3-5
Summary of Contents for CR-10 Chariot
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