BATTERIES
Battery Testing
Page 14-12
2008-2011 IQ Plus Electric Vehicle Maintenance and Service Supplement
14
If the difference between the cells is 0.020 or more, the low cell should be suspected. It may require a catch-
up charge or it may be a weak cell. When the variations between cells reach 0.050 or more, the battery with
the low cell should be replaced.
DISCHARGE TEST
If the previous tests have failed to identify the problem, conduct a discharge test. The discharge test comes
closest to simulating actual vehicle operating conditions by continuously drawing current from the batteries
until voltage drops to 42.0 volts.
The discharge test is the hardest test on the batteries and the most time-consuming to perform. Use the bat-
tery discharge tester (CC P/N 101831901).
Performing the Discharge Test
1. Be sure the batteries are fully charged and that the electrolyte level is correct in all cells.
2. Connect the tester leads to the positive (+) post of battery no.1 and negative (–) post of battery no. 8.
3. Check and record the electrolyte temperature of the battery packs. Check cell no. 2 (second cell from
positive post) in each battery.
4. Reset discharge machine and turn the tester ON.
5. When the batteries have been discharging for approximately 60 minutes, set the discharge machine to
function 3 and check battery set voltage. Check voltage every 10 minutes throughout the rest of the test.
As soon as the battery set voltage reaches 0.5 volts above the shut-off point (42.0 volts), use a multim-
eter to measure individual battery voltages. Measure and record the voltage of each battery to the near-
est 0.01 volt.
See following NOTE.
NOTE:
The tester will shut off automatically when shut-off voltage is reached.
VEHICLE
NO.
BATTERY
NO.
ELECTROLYTE
TEMPERATURE
CORRECTION
FACTOR
CORRECTED SPECIFIC GRAVITY
REQUIRED
ACTION
CELL 1
CELL 2
CELL 3
12
1
20 °F (-6.6 °C)
– 0.024
1.275 –0.024
= 1.251
1.280 – 0.024
= 1.256
1.280 – 0.024
= 1.256
Sound Battery –
Fully Charged
35
6
90 °F (32.2 °C)
+ 0.004
1.155 + 0.004
= 1.159
1.165 + 0.004
= 1.169
1.160 + 0.004
= 1.164
Discharged
Battery –
Recharge
54
3
50 °F (10 °C)
– 0.012
1.260 –0.012
= 1.248
1.200 – 0.012
= 1.188
1.270 – 0.012
= 1.258
Bad no. 2 Cell
69
5
80 °F (26.7 °C)
0.000
1.250 – 0
= 1.250
1.255 – 0
= 1.255
1.230 – 0
= 1.230
Weak no. 3
Cell – Catch-up
Charge
38
2
100 °F (37.8 °C)
+ 0.008
1.200 + 0.008
= 1.208
1.180 + 0.008
= 1.188
1.170 + 0.008
= 1.178
Discharged
Battery –
Recharge and
Recheck
22
4
80 °F (26.7 °C)
0.000
1.240 – 0
= 1.240
1.245 – 0
= 1.245
Float does
not rise
no.3 Cell Dead
– Replace Bat-
tery
Содержание IQ PLUS 2008
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