|A battery can explode if you do not follow the proper procedure, causing serious injury to anyone nearby.|
Follow all procedures carefully and keep sparks and open flames away from the battery.
NOTE: To get accurate results, the temperature of the electrolyte must be between 21 and 38 °C (70 and 100 °F) before testing.
Test Equipment Required
- Battery Tester with:
Voltmeter with 0-18 V scale, ammeter with 0-100 A and 0-500 A scales, and a carbon pile with 0-300 W
- 12 V Battery Charger:
Fast charge capability of 50 A and slow charge capability of 5 A
|1.||Check for damage: If the case is cracked or the terminals are loose, replace the battery.|
|2.||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 3.|
|3.||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.
- If the reading stays above 9.6 V, the battery is OK; clean its terminals and case, and reinstall it.
- 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.
|Amperage will drop as voltage increases; do not increase the amperage to compensate or you may damage the battery.|
- Watch the battery voltage during the entire 3 minutes; the highest reading should stay below 15.5 V.
- If the reading stays below 15.5 V, the battery is OK; clean its terminals and case, and reinstall it.
- If the reading exceeds 15.5 V any time during the 3 minutes of fast charge, the battery is not good; replace it.
- 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.
- If the voltage stays above 9.6 V, the battery is OK; clean its terminals and case, and reinstall it.
- If the voltage still drops below 6.5 V, the battery is not good; replace it.