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From the manual, about the charging indicators: "If they flash quickly the batteries may be bad." This would probably mean that the batteries are damaged somehow and cannot be charged.
The light means the battery is about to discharge, to replace asap.
It could mean anything from "your battery is charged" to "the regulator circuit has failed." Unplug the charger and consult the manual, or check the manufacturer's website.
Do you mean that you can not charge it with a battery charger or the mower will not charge it while it is running? If you can not charge it with a battery charger and you are sure that the charger works then the battery is bad. These type batteries are only good for a couple years. If the mower is not charging the battery it could be a number of things.
If you mean the wires in the battery charger's household AC power cord the three wires are "Hot" or "Live", "Neutral", "Ground".
If the charger has a ammeter on it then it should show close to zero which means the battery is no longer pulling any current from the charger which would mean the battery is fully charged. If it has only a voltmeter then it should show 12.5-13.5 vdc
Do you mean charge by the vehicle running....or do you mean take a charge from a Bench charger? if its in the vehicle it could mean that either the battery/battery connection/cables, a faulty ground, or the alternator is defective. If its on a bench charger then the battery has a dead cell or is defective and needs replacing.
do you mean the alternator or a mains charger any cheap mains charger should do fine if that's what you meant
because you have just plugged it in it checks if it is a charger
it means the light on a battery of a computer or cell phone
It means that the charger is built to be used together with a battery that has a 500 mAh (500 milli ampere hours) capacity.
the battery light means that your battery is being charged properly. so let it light.