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yes
yes, it will just charge the device faster..
No. In general, a charger needs to be able to figure out when the battery has reached full charge, otherwise the charger can damage the battery by overcharging it. You need to use the specific charger required for the battery. And, if you are trying to power a non-battery device that requires 1A from a 5V 100mA source, you will not be able to maintain 5V, so it will not work there either.
Use your USB port or get a Blackberry charger (it's converted to 5v)
Yes - the Ipod charger is 5.1v, and the Walkman is 5v. Use the Sony USB cable & it will charger just fine (Sony NWZ-Z1040 charged with Ipod/Ipad/Iphone USB charger confirmed).
Most of the mobile phones have batteries of less than 5V rating, mostly up to 3.7V.Chargers are typically rated for less than 5V.Caution: It is not safe to charge these with a 9V charger. The battery may explode..
If a device has that as their input current, it most likely means that it requires 1000 milliamp hours of power at 5 volts. A device with this would require a 5V 1000mAh charger/power cable. This type of power output is generally given by newer smartphone chargers (e.g. Galaxy S3)
If the mains charger is not broken it will work as good as a computer usb port, all they do is supply 5V to the battery charging circuitry inside your camera.
input voltage is strictly according to applications. If use 12V dc adapter power 5V dc device, the 5v dc device would be damaged.
No. The windings are set for 9vdc and will not step down to 5vdc.
The one with the output of 5v 800ma as this will charge devices quicker and overheat less.