Travel Technology - USB Charging Question

I have a ton little gadgets that charge off of USB. Each one came with a "brick" that has a wall plug on one end and the USB plug on the other. IOW, I plug one end of the USB cable into my gadget, and the other into this brick. I then plug the brick into the wall.

What I would love to know is how interchangeable are those "bricks"? Any ideas?

They should all provide the same kind of voltage, but some will provide more current than others. I've never had a problem swapping them around EXCEPT for chargers for Motorola phones and my Blackberry. For some reason those 2 seem to be different.

The bricks should all have text on them (maybe a sticker, maybe molded into the plastic) giving an output voltage and current rating.

The output voltage should all be 5V (the USB spec). If you want to travel with just one brick, pick the one with the highest current rating and it should work fine for all your devices

(YMMV of course, especially if some devices don't really follow the USB spec. As always, test at home before hitting the road. :) )

I took a look at a few of them. 1 says 5.5 Volts, and the others say 5.0 volts. The all seem to say 1 Amp, and those are all for output, I assume the input doesn't matter. Should I use the 5.0 volt ones, or the 5.5 one? Does it matter? I would assume it does. If I am underpowered, does that just mean it takes longer to charge? If I am over-powered, can I fry something?

Sorry for all the questions...

And thanks for the help so far!

AJ

I took a look at a few of them. 1 says 5.5 Volts, and the others say 5.0 volts. The all seem to say 1 Amp, and those are all for output, I assume the input doesn't matter. Should I use the 5.0 volt ones, or the 5.5 one? Does it matter? I would assume it does. If I am underpowered, does that just mean it takes longer to charge? If I am over-powered, can I fry something?

AJ

Might want to check the input also to be sure that 220 / 50 is supported for foreign travel.

I have a ton little gadgets that charge off of USB. Each one came with a "brick" that has a wall plug on one end and the USB plug on the other. IOW, I plug one end of the USB cable into my gadget, and the other into this brick. I then plug the brick into the wall.

What I would love to know is how interchangeable are those "bricks"? Any ideas?

USB out put shoudl be standard since you can charge any usb device into any USB port on a computer and you do nto over load the device....