2.
Conduct a hydrometer test of the battery electrolyte.
B. If the battery has recently been charged, apply a
amp load for 15 seconds to remove the surface
charge. Use a battery load tester following the
manufacturer’s instructions.
150
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.
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.
E. Connect a battery load tester to the battery termi-
nals following the manufacturer’s instructions.
Connect a digital multimeter to the battery terminals.
B. Temperature correct each cell reading. For each
10
oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
specific gravity reading. For each 10oF (5.5oC) be-
F. Applyatestloadof345amps(onehalfthebattery
cold cranking amp rating) for 15 seconds.
low 80oF (26.7oC) subtract 0.004 from the specific
gravity reading.
G. Take a battery voltage reading at 15 seconds,
then remove the load.
Example: Cell Temperature
Cell Gravity
100oF
1.245
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)
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
100
(37.7
20
(11
Minimum
Voltage
Battery Electrolyte
Temperature
ADD (conversion above)
Correction to 80oF (26.7oC)
0.008
1.253
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70oF (and up)
21oC (and up)
16oC
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
60oF
50oF
40oF
30oF
10oC
4oC
--1oC
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.
20oF
10oF
--7oC
--12oC
0oF
--18oC
3.
Perform a high--discharge test with an adjustable
load tester.
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.
Thisisoneofthemostreliablemeansoftestingabattery
asitsimulatesthecold--crankingtest.Acommercialbat-
tery load tester is required to perform this test.
CAUTION
Follow the manufacturer’s instructions when us-
ing a battery 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 before continuing with
load testing procedure.
Electrical System
Page 5 -- 46
Groundsmaster 4100--D/4110--D
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