Battery Testing
If battery filler caps are removable, conduct a
C. Make sure battery terminals are free of corrosion.
1.
D. If battery filler caps are removable, measure the
temperature of the center cell.
hydrometer test of the battery electrolyte.
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 manufacturer’s instructions.
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--
upthehydrometer.Atthesametimetakethetemper-
ature of the cell.
F. Apply atestloadof270amps (onehalftheCrank-
ing Performance rating of the battery) for 15 se-
conds.
G. Take a battery voltage reading at 15 seconds,
then remove the load.
B. Temperature correct each cell reading. For each
10
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
specificgravityreading.Foreach10oF(5.5oC)below
oF (26.7oC) subtract 0.004 from the specific grav-
ity reading.
H. Using the table below, determine the minimum
voltage for the cell temperature reading.
80
Minimum
Voltage
Battery Electrolyte
Temperature
Example: Cell Temperature
Cell Specific Gravity
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)
100oF
1.245
100
(37.7
20
(11
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
60oF
21.1oC (and up)
15.6oC
10.0oC
4.4oC
50oF
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
40oF
30oF
--1.1oC
--6.7oC
--12.2oC
--17.8oC
C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cellspecificgravityislessthan1.225,chargethebat-
tery.Chargeattherecommendedrateandtimegiven
in Charging or until all cells specific gravity is 1.225
or greater with the difference in specific gravity be-
tween the highest and lowest cell less than 0.050. If
these charging conditions can not be met, replace
the battery.
20oF
10oF
0oF
I. If the measured battery voltage is below the mini-
mum voltage shown in the table, replace the battery.
If the measured voltage is at or above the minimum
voltage shown in the table, return the battery to ser-
vice.
2.
load tester.
Perform a high--discharge test with an adjustable
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulates thecold--crankingtest.Acommercial bat-
tery load tester is required to perform this test.
CAUTION
Follow the manufacturer’s instructions when us-
ing a battery load tester.
A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4
VDC, charge the battery.
B. If the battery has been charged, apply a 150 amp
load for 15 seconds to remove the surface charge.
Useabattery loadtester following themanufactur-
er’s instructions.
Workman HD Series
Page 8 -- 31
Electrical System
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