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Charging via Motorola RAZR charger

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Mr Average:
The RAZR charger has a USB plug at the end - I'm wondering if it could be used as an alternate (or even side by side???) charger for the iRiver series.

RAZR lead -  Outputs 5V at 550mA

iRiver AC lead - Outputs 5V at 2A

So the battery shouldn't fry, it should just be a slower charge due to the lower ampage

?

nobby:
assuming the connector is the same, are both of the same polarity?

Mr Average:
The RAZR doesn't specify it's polarity

nobby:
then test it with a multimeter. if its wrong, it WILL fry the iriver without a shadow of a doubt.

kenshin:
The iRiver's can't be charged off the USB, can they? The hardware isn't there. I've never seen my 120 charge up when plugged it into my computer (but I can sure drain it fast!!) but my RAZR sure does.

I would assume there's only one polarity on a USB plug. It's not like we have AC USB vs. DC USB and such. USB is USB. Maybe that's a stupid assumption but considering the number of devices that can charge off USB these days that all work off the exact same cables you'd have to assume there's only one polarity.

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