Probably the alternator or its drive belt has failed
That light doesn't mean that your battery needs to be replaced. It means that your battery is not being charged while the car is running. Have your alternator tested.
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.
Sounds like the alternator is not charging the battery. The first thing to do is check the battery voltage while the engine is running and see if you have 13 Volts or better and work from there.
That it needs to be charged or is running out of battery.
That your engine is not running.
remove the battery and plug the power supply You mean running on AC power without a battery?
it means it isn't using power from the battery. it is coming strait from the outlet...aka battery is charged and its not using battery power
They mean different things. "When" = "at the time that." "While" = "during the time that." Did you lose weight when you were running every day? You must carry water with you when you are running long distances. I have a chance to enjoy the scenery along the trail while I am running on the hiking path. It is hard to carry on a conversation while you are running.
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.
Alternator may not be charging the battery sufficienty Test with a voltmeter A fully charged battery should read approx. 12.8 volts without engine running Should read approx. 13.8-14.2 with engine running
Sometimes, with the vehicle running, you can remove the positive lead from the battery and the vehicle with either keep running or stop. If it stops that can mean the alternator is bad. This is not 100% accurate, depending on the type vehicle, etc.
Check with a voltmeter connected to the battery Voltage with engine running should be approx. 13.8-14.2 volts- above this could be a defective voltage regulator