Battery Testing
Conduct a hydrometer test of the battery electrolyte.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
1.
12.4
VDC, charge the battery before performing a
load test.
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
B. If the battery has been charged, apply a 150 amp
load for fifteen (15) seconds to remove the surface
charge. Use a battery load tester following the
manufacturer’s instructions.
A. Measure the specific gravity of each cell with a
hydrometer. Draw electrolyte in and out of the
hydrometer barrel prior to taking a reading to warm--
up the hydrometer. At the same time take the tem-
perature of the cell.
C. Make surebattery terminals arefreeofcorrosion.
D. Measure the temperature of the center cell.
B. Temperature correct each cell reading. For each
10
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
E. Connect a battery load tester to the battery termi-
nals following the manufacturer’s instructions.
Connect a digital multimeter to the battery terminals.
specific gravity reading. For each 10oF (5.5oC) be-
low 80oF (26.7oC) subtract 0.004 from the specific
gravity reading.
F. Apply a test load of 345 amps (one half thecrank-
ing performance rating of the battery) for fifteen (15)
seconds.
Example: Cell Temperature
Cell Gravity
100oF
1.245
100
(37.7
20
(11
oF minus 80oF equals 20oF
oC minus 26.7oC equals 11.0oC)
oF multiply by 0.004/10oF equals 0.008
oC multiply by 0.004/5.5oC equals 0.008)
G. Take a battery voltage reading at fifteen (15) se-
conds, then remove the load.
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cellspecificgravityislessthan1.225,chargethebat-
tery. Charge at the recommended rate and time giv-
en in Charging or until all cells specific gravity is
Minimum
Voltage
Battery Electrolyte
Temperature
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
60oF
21oC (and up)
16oC
10oC
4oC
1.225
orgreater withthedifferenceinspecificgravity
between the highest and lowest cell less than 0.050.
If these charging conditions can not be met, replace
the battery.
50oF
40oF
30oF
--1oC
--7oC
--12oC
2.
Perform a high--discharge test with an adjustable
load tester.
20oF
10oF
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
0oF
--18oC
I. If the test voltage is below the minimum, replace
the battery. If the test voltage is at or above the mini-
mum, return the battery to service.
CAUTION
Follow the manufacturer’s instructions when us-
ing a battery load tester.
Groundsmaster 4000--D/4010--D
Page 5 -- 49
Electrical System
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