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HIGH FREQUENCY CHARGER (ONBOARD)
Test Procedures
Page 10-16
2008-2011 Domestic Battery Charger Maintenance and Service Manual
10
Interpreting Discharge Test Results: 12-Volt Batteries
1. If discharge time is 60 minutes or higher, the problem is not with the batteries.
2. If discharge times are low (less than 60 minutes), replace batteries below 10.05 volts.
3. In general, battery sets that discharge in less than 60 minutes at 78 °F (25.6 °C) on the discharge test
will typically not hold a charge for an entire work shift. However, discharge time is dependent on the elec-
trolyte temperature. The table shown gives the discharge times, at various temperatures, of a set of bat-
teries that delivers 62 minutes at 80 °F (26.7 °C).
BATTERY VOLTAGES
BATTERY CONDITION
1
2
3
4
10.50 V
10.50 V
10.50 V
10.50 V
Excellent
10.60 V
10.60 V
10.83 V
9.75 V
Battery no. 4 is near end of useful life
10.8 V
10.8 V
10.01 V
9.41 V
Battery nos. 3 and 4 are near end of useful life
ELECTROLYTE
TEMPERATURE
DISCHARGE TIME TO
SHUT-OFF POINT
ELECTROLYTE
TEMPERATURE
DISCHARGE TIME TO
SHUT-OFF POINT
40-49 °F
(4-9 °C)
40 Minutes
85-89 °F
(29-32 °C)
64 Minutes
50-59 °F
(10-15 °C)
45 Minutes
89-99 °F
(32-37 °C)
66 Minutes
60-64 °F
(16-18 °C)
50 Minutes
100-109 °F
(38-43 °C)
68 Minutes
65-69 °F
(18-21 °C)
54 Minutes
110-119 °F
(43-48 °C)
70 Minutes
70-74 °F
(21-23 °C)
57 Minutes
120-129 °F
(49-54 °C)
72 Minutes
75-79 °F
(24-26 °C)
60 Minutes
130-150 °F
(54-66 °C)
74 Minutes
80-84 °F
(27-29 °C)
62 Minutes
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Summary of Contents for 2008-2011
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