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Yes, you can use a 550mA charger to charge a PS controller that requires 300mA. The controller will only draw the amount of current it needs (300mA), so the higher capacity charger won't harm it. However, it's essential to ensure that the voltage is compatible; using a charger with the correct voltage rating is crucial to avoid damaging the controller.
What else can I help you with?
Can a 12v 550ma device be run by a 12v 210ma supply?
No, the supplies output is too small. To run a 550mA device a supply source of 600mA and larger would be needed.
Can you use a 5 volt equal equals 550mA charger in place of a 5volt equal equals 1amp charger?
That depends what you're charging with it. If the device that you're charging originally came with a 1-amp charger, that was probably because it sometimes draws more than 550 mA while it's charging. Put it on a 550-mA charger instead, and there's a good chance that the smaller charger will either overheat or die. You can go ahead and try it ... it won't hurt the device you're trying to charge up. Set them up, plug the charger in, and don't walk away. Stay there and feel the charger every couple of minutes. -- If it's getting too hot to touch, then unplug it, and break down and buy a new 1-amp charger. -- If it just slowly gets warm, then you can probably get away with using it for short periods of time, and you can keep your device charged that way. -- If it stays cold for 15 minutes, then it means one of two things: either (1). the device doesn't need a 1-amp charger at all, and the smaller charger will keep it charged just fine, or else (2). the charger died instantly as soon as you turned it on, the device isn't charged, and you need a new charger. (In case of #2, buy a 1-amp charger.)
Can 550Ma kill?
If you mean 550 mega-amperes (as you wrote it, million amperes) it not only will kill a person, it will vaporize a person!If you mean 550 milliamperes that depends on how it is applied to a person:Currents of only 10 microamperes (millionths of an ampere) can kill if applied directly to the heart.Currents of more than 30 milliamperes of AC (rms, 60 Hz) or 300 milliamps of DC can kill if applied to the skin.Note: milliamperes is written mA, mega-amperes is written MA.
How long will a 12v 1A battery last on a 12v 550mA fish finder?
There's no such thing as a "1A" battery. If you look at it more closely, you may find that it's rated "1AH". In that case, the math says that after being fully charged, that battery would run that fish-finder for 1hour 49minutes, although the battery voltage might begin to sag toward the end of that period. If the battery doesn't say "1AH" on it, then ignore this whole discussion. There's not enough information to answer the question.
