[g1-hackers] A/C vs USB Charging

[soup]

2009/2/25 Hermann Mundprecht <hmun at thinkthinkdo.com>

> Just wanted to update you on the question if the phone really charges
> faster when using my modified USB-cable with my car charger.
> Today i drove 2 hours with my car.
> At the start the phone was 50% charged.
> I had Andnav2 navigating with cell and GPS location turned on, wifi
> turned on and i did a 40 minutes phone call using a bluetooth headset.
> Power Manager showed that the phone is "A/C powered" and after one hour
> the phone was 100% charged.
>
> Without the modified cable it would have been 90% empty after the drive.
> A software solution would still be preferable but the hardware solution
> is worth the USB extension cable and the half hour of soldering.
>
> Hermann Mundprecht schrieb:
> > Your right it would be quite hard to create a cable like this by just
> > using a standard USB cable as soldering together pin 4 and 5 within the
> > plug is quite impossible and there is no 5th cable in a normal USB
> > cable. That is the reason why i used the plug from the A/C charger.
> >
> > Even after the test with the ampermeter i am still not sure that the G1
> > really drains more Amps in "A/C powered" than in "Computer powered" mode.
> >
> > Bob K Mertz schrieb:
> >
> >> Hermann Mundprecht wrote:
> >>
> >>
> >>
> >>> The only thing that is still unclear to me is if the G1 now actually
> >>> drains more Amps from the computer or charger. I think i am going to
> cut
> >>> another USB extionsion cable in half and connect my multimeter in
> series
> >>> to the 5+ cable.
> >>>
> >>>
> >>>
> >> The problem I saw is that USB cables don't actually have a wire for pin
> >> X since, well, it's not used.  Since you used the OEM A/C charger, it
> >> would have that cable because it's used.  When cutting apart a mini-USB
> >> cable there still isn't a way to connect pin X to ground so it would
> >> have to be done inside the mini-USB plug it's self.   Kind of a
> >> frustrating scenario :)
> >>
> >> I still think it would be really great to be able to have a program that
> >> you could use to force the G1 into A/C charging mode so that you didn't
> >> have to go hacking together cables.  Unfortunately I am far from a
> >> coder... I'm a hardware guy.... so I'm clueless on how to go about that.
> >>
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> >>
> >>
> >>
> >
> >
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>
Thank you very much for posting this!
It definitely makes the decision to put in the effort a lot easier.

Corey B (soup)
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