BATTERIES 7
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The conditioning process can be monitored by checking
the specific gravity of the battery cells. After the battery
set has been recharged, spot check two or more battery
cells. A fully charged fully conditioned battery with an
electrolyte temperature of 80° F (27° C) has a gravity
reading of 1.280.
Once the battery set has completed 50 charge/discharge
cycles, Depth of Discharge (DOD) can be measured.
To determine the DOD, measure the battery pack voltage
after mowing for a period of two weeks. Average the
results and look up the DOD, using the left side chart in
Figure 7B. These values are based on a standard 78° F
(25.5° C) battery temperature. Using the DOD refer to the
right side chart in Figure 7B to determine theoretical life
cycles.
As a battery ages, it still performs adequately except the
expected run time, or capacity, will decrease. Capacity
describes the time that a battery can continue to provide
its design amperes from a full charge.
Temperature is important when conducting tests on a
battery and test results must be corrected to compensate
for temperature differences.
Figure 7A
Figure 7B
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