BATTERIES
Battery Testing
Page 13-10 1998/1999 PowerDrive Plus Maintenance and Service Supplement
13
7. Repeat steps 2 through 6 on all cells.
Hydrometer Calibration
Most hydrometers are calibrated to read correctly at 80°F. The readings obtained as described above must be cor-
rected for temperature. For each 10°F above 80°F, add .004 to the reading. For each 10°F below 80°F, subtract .004
from the reading.
Interpreting the Results of the Hydrometer Test
The approximate state of charge can be determined from the following table:
If the difference between the cells is .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 .050 or more, the battery with
the low cell
should be replaced.
Figure 13-8 Hydrometer
SPECIFIC GRAVITY AT 80°
STATE OF CHARGE
1.250 - 1.280
100%
1.220 - 1.240
75%
1.190 - 1.210
50%
1.160 - 1.180
25%
4 0
2 0
6 0
8 0
13 00
1.250
1.280
VIEW AT EYE LEVEL
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