HIGH FREQUENCY CHARGER (ONBOARD)
Test Procedures
2008-2011 Domestic Battery Charger Maintenance and Service Manual
Page 10-13
10
Interpreting the Results of the Hydrometer Test: 8-Volt Batteries
The approximate state of charge can be determined from the following table:
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.
SPECIFIC GRAVITY
(TEMPERATURE
CORRECTED)
APPROXIMATE
STATE OF CHARGE
1.250-1.280
100%
1.220-1.240
75%
1.190-1.210
50%
1.160-1.180
25%
VEHICLE
NO.
BATTERY
NO.
ELECTROLYTE
TEMPERATURE
CORRECTION
FACTOR
CORRECTED SPECIFIC GRAVITY
REQUIRED
ACTION
CELL 1
CELL 2
CELL 3
CELL 4
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
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
1.165 – 0.004
= 1.169
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
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
1.250 – 0
= 1.250
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
1.180 + 0.008
= 1.188
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
1.250 – 0
= 1.250
no.3 Cell Dead
– Replace Bat-
tery
Summary of Contents for 2008-2011
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