Hyundai Sonata 1991 Shop Manual page 137

CHARGING SYSTEM
Check specific gravity.
Refer to "Specific gravity check chart"
for electrolyte temperature compensation, and
then select proper reading below.
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Below 1.100
1.100 - 1.220 Above 1.220
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Slow charge Recharge Perform load test
Slow charge battery at 6A for no
Refer to charging guide and safety
more than 14 hrs., and then precautions
perform load test.
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Load test battery
Apply 200A load for 15 sec., then check battery
voltage and compare below
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Above 9.6 volts I 9.6 - 6.5 volts
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Below 6.5 volts
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Battery O.K. reuse
Fast charge battery and then
perform load test again.
NOTE: If battery is still less then
9.8 volts after second fast charge
and load test, then it should be
replaced
Battery no good.
Replace
27-18