It may make the batteries charge a little quicker but do not go much over what the amperage of the original charger was. You do know that voltage must be identical.
The part number needs to match the old charger. Even if if the watts, volts, and amps match; there is no garuantee that the polarity of the pins will be the same.
The difference between 220 amps and 240 amps lies in their amperage ratings. 220 amps denotes a current capacity of 220 amperes, while 240 amps indicates a current capacity of 240 amperes. The higher the amperage, the greater the power capacity for electrical devices.
No. The speed at which the charger will charge the battery is determined by how many amps the charger outputs.
No problem whatsoever. As long as Voltage is the same and the supply Amps is greater than the laptop's Amps, all will be well. The Voltage will be supplied no matter what your laptop needs, creating an overload if the supply is greater than the demand. The Amperage will vary automatically depending on your laptop's need. There would be a problem if you used a 19V 2A power supply.
The formula you are looking for is I = W/E. Amps = Watts/Volts. 300/24 = 12.5 amps. A good charger with an output of 15 amps will do the job nicely. The time that it will take to charge the battery will depend on the amp/hrs of the connected battery and the state of discharge that the battery is in when charging starts.
12
7 amps
You cannot compare these two totally different things. As far as amperage the charger puts out more amps if it is an auto battery charger and also puts out 12 volts. If you are talking about a 9 volt battery charger then the battery may or may not be more powerful, it depends on how many mii-amps the charger is putting out.
Yes, you need to use a trickle charger or a very small charger such as one smaller than 5 amps.
It could be a problem when the laptop asks for 4.74 amps and the adaptor can't do that without heating up too much.
With a 12 volt battery charger set to around 5 amps. Do not overcharge if it is not an automatic charger.
You can charge a 12 volt battery with a 6 AMP charger. The amount of amps put out by the charger is actually the rate which the power flows out from the charger, not the amount of volts it will charge. Volts and Amps are two different things. You can't charge up a 12 volt battery all the way, using a 6 volt charger. You can charge a 12 volt battery with a 12 volt charger rated at '6 amps'. It will charge the battery faster than a 2 amp charger will, but it will take longer than using a 12 amp charger. You probably don't want to use anything higher than a 12-16 amp charger for charging a 12 volt battery. Some chargers are equipped with a 60amp boost charge that is used for starting the vehicle, without having much of a charge in the battery. You DO NOT want to attempt charging a battery with it set to a 60amp boost charge. That is for starting vehicles only and could damage your battery. Keep in mind that the lower the amps are, that you use to charge the battery (1-2amps), will result in the charge lasting longer without recharging it, than if it was charged up at a higher setting (12-16amps).