Question about 2010 kawasaki KX 450F

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Whilst all of the original answer is correct (and also very well explained) it doesn't explain how to check your charging system output. If your battery is always losing it's charge it could be either a faulty or dying battery that needs changing for a new one or it is not receiving a charge. To check this you will need a digital meter set to less than 20volts DC. Check the charge across the terminals and as previously described you hopefully have 12.5 volts or slightly higher as this means the battery is charged. Start the bike up and get it idling/ticking over. Recheck the voltage across the terminals and hopefully you will have around 13.5 volts. If you do, then your charging system is working and if not it is at fault and needs investigating. If the battery is being charged but still loses voltage over time whilst standing then as I said the battery may be past its best and want replacing. There is sometimes another reason for voltage drop and that is called a "parasitic draw" which basically means that something is causing power to be lost. A good example is an alarm system that uses low power to run it but can cause a total power loss over time if not charged. Another might be caused by something just shorting to earth/grounding out.

Posted on Nov 24, 2014

  • skp76476 Nov 24, 2014

    Good catch :-)


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Are talking about a 12v vehicle battery?

If so, and if your charger is working properly, use a voltmeter to check the voltage of a battery to determine the state of charge. Use this chart to determine if your battery charged or not.

State of Charge Voltage
100% 12.7 - 13.2
75% 12.4
50% 12.2
25% 12.0
Discharged 0 - 11.9

If your battery is reading 0 volts, chances are the battery experienced a short circuit. If the battery cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell. If the battery is fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated. Sulfation occurs naturally when the battery discharges.. Re-charging the battery will reverse the sulfation crystals and turn it back into electrolyte, ready to produce power again. But if a battery sat, uncharged, severely discharged, and/or drained for extended periods of time, the sulfation will increase in size and harden onto the plates. This covers the surface area of the plates, removing the chemicals the battery uses to produce power. Sulfation decreases the battery's capacity to reach it's full charge, and the battery will also rapidly lose it's charge.. At this point, charging alone will not restore the battery to a healthy condition, and you should buy a new battery.

I hope that helps!

Posted on Nov 24, 2014


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