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BATTERIES
Battery Testing
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
Page 14-13
14
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 5.0 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
5
6
7
8
5.25 V
5.25 V
5.25 V
5.25 V
5.25 V
5.25 V
5.25 V
5.25 V
Excellent
5.30 V
5.30 V
5.45 V
4.70 V
5.30 V
5.30 V
5.30 V
5.30 V
Battery no. 4 is near end of useful life
5.40 V
5.40 V
5.00 V
5.40 V
4.60 V
5.40 V
5.40 V
5.40 V
Battery nos. 3 and 5 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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