BATTERIES
Battery Testing – 8 Volt
16
Interpreting Discharge Test Results
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 6.7 volts.
BATTERY VOLTAGES
1
2
3
4
5
6
BATTERY CONDITION
7.00
V
7.00
V
7.00
V
7.00
V
7.00
V
7.00
V
Excellent
7.07
V
7.07
V
7.22
V
6.50
V
7.07
V
7.07
V
Battery no. 4 is near end of useful life.
7.20
V
7.20
V
6.67
V
7.33
V
6.27
V
7.33
V
Battery nos. 3 and 5 are near end of useful life.
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 electrolyte
temperature. The table shown gives the discharge times, at various temperatures, of a set of batteries that
delivers 62 minutes at 80 °F (26.7 °C).
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
*****
*****
2009 Electric Precedent Maintenance and Service Manual
Page 16-13
