Battery Testing
Conduct a hydrometer test of the battery electrolyte.
C. Make surebattery terminals arefreeofcorrosion.
1.
D. Measure the temperature of the center battery
cell.
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
E. Connect a battery load tester to the battery termi-
nals following the load tester manufacturer’s in-
structions. Connect a digital multimeter to the
battery terminals.
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.
F. Applyatestloadof325amps(onehalftheCrank-
ing Performance rating of the battery) for fifteen (15)
seconds.
B. Temperature correct each cell reading. For each
10
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
G. Take a battery voltage reading after the load has
been applied to the battery for fifteen (15) seconds,
then remove the load. Record the voltage reading.
specific gravity reading. For each 10oF (5.5oC) be-
low 80oF (26.7oC) subtract 0.004 from the specific
gravity reading.
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
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)
Minimum
Voltage
Battery Electrolyte
Temperature
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
21.1oC (and up)
15.6oC
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
60oF
50oF
40oF
10.0oC
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
4.4oC
30oF
20oF
--1.1oC
--6.7oC
10oF
0oF
--12.2oC
--17.8oC
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.
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.
2.
Perform a high--discharge test with an adjustable
load tester.
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
CAUTION
Follow the battery load tester manufacturer’s
instructions when using a load tester.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4
VDC, recharge the battery.
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.
Groundsmaster 4500--D/4700--D
Page 5 -- 35
Electrical System
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