12 Volt Battery Test
NOTE: If there is any HONDA specified region-specific testing method available, follow that.
12 Volt Battery – Test
A 12 volt 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 12 volt battery.
The 12 volt battery contains sulfuric acid (electrolyte) which is highly corrosive and poisonous.
Getting electrolyte in your eyes or on your skin can cause serious burns.
Wear protective clothing and eye protection when working on or near the 12 volt battery.
Swallowing electrolyte can cause fatal poisoning if immediate action is not taken.
NOTE: To get accurate results, the temperature of the electrolyte must be between 21 and 38 °C (70 and 100 °F) before testing.
Battery Test Equipment Required
- 12 Volt 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 Volt Battery Charger:
Fast charge capability of 50 A and slow charge capability of 5 A
Regarding the 12 volt battery check and 12 volt battery charge method.
- If 12 volt battery has description, follow it.
- When you charge the 12 volt battery, you must remove the 12 volt battery from the vehicle.
- Check for damage: If the case is cracked or the terminals are loose, replace the 12 volt battery.
- Test 12 volt battery load capacity by connecting a 12 volt battery tester, and applying a load of three times the 12 volt battery ampere hour rating.
When the load has been applied for exactly 15 seconds, the battery voltage reading should stay above 9.6 V.
NOTE: Make sure of the ampere hour rating at the Design Specifications.
- If the reading stays above 9.6 V, the 12 volt battery is OK; clean its terminals and case, and reinstall it.
- If the reading is between 6.5 and 9.6 V, connect a 12 volt battery charger and charge the 12 volt 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 12 volt 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 12 volt 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 12 volt battery is not good; replace it.
- If the reading drops below 6.5 V, slow-charge the 12 volt battery by connecting a 12 volt battery charger, and charge at 5 amps for no more than 24 hours.
Then test load capacity again.
- － If the voltage stays above 9.6 V, the 12 volt battery is OK; clean its terminals and case, and reinstall it.
- － If the voltage still drops below 6.5 V, the 12 volt battery is not good; replace it.