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Does anybody know about Motorola chargers (or usb charging in general)?

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DrkLrdsSlv

Member
Joined
Mar 5, 2005
Location
Illinois
I've got a motorola q9c which charges via usb (but only with a special windows driver) or via a wall wart. It uses a mini usb plug.

Now I recently had my secondary tag-along charger die and quickly ordered a cheapy from amazon. But, apparently my phone only likes OEM chargers, because it refuses to charge with this new one :confused:

Suspecting it may be due to the lower amperage of the new charger (450mA vs 550mA), I ripped it apart and frankensteined together a new charger out of old parts, which output up to 1000mA. And once again, no dice. One thing I noticed from the cheap charger was that only 2 pins were used from the usb cable - +5vdc and gnd.

What exactly makes the OEM charger "special" so that my phone will accept current from it?
 
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vgta88

Member
Joined
Nov 15, 2007
i think they have a proprietary usb connection. like its wired differently not how much amps its outputing. thats how the razrs were. I think they needed to send a signal to tell if it was a usb headset or a charger.
 
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AlexanderB

Member
Joined
Oct 30, 2007
Location
Netherlands Europe
the original one has a tiny resistor in the phone connector.. its wired to the normally unused pin of the usb connector (theres 5 pins in the mini and only 4 in the normal one..)

the other way around would be firmware-modding the phone to charge from any 5v source, this was very easy to do on the razr's dunno about your phone tho..