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Test Procedure
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Check for damage: If the case is cracked or the terminals are loose, replace the battery.
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Check indicator (for basic charge condition): Blue or Green is OK. If the indicator is red, peel the tape off, remove the caps, and add distilled water; then reinstall the caps and tape. If the indicator is clear, go to
Step 3
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Test battery load capacity by connecting a battery tester, and applying a load of three times the battery ampere hour rating.
When the load has been applied for exactly 15 seconds, the battery voltage reading should stay above 9.6 V.
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If the reading stays above 9.6 V, the battery is OK; clean its terminals and case, and reinstall it.
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If the reading is between 6.5 and 9.6 V, connect a battery charger and charge the battery for 3 minutes at an initial rate of 40 amps.
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Amperage will drop as voltage increases; do not increase the amperage to compensate or you may damage the battery.
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If the reading drops below 6.5 V, slow-charge the battery by connecting a battery, and charge at 5 amps for no more than 24 hours (or until the indicator shows full charge, or the specific gravity of the electrolyte is at least 1.270).
Then test load capacity again.
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If the voltage stays above 9.6 V, the battery is OK; clean its terminals and case, and reinstall it.
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If the voltage still drops below 6.5 V, the battery is not good; replace it.
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