[Q] not Charging from external Battery (USB)

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Hi,

My Atrix does not have any Problems with charging when connected to my PC, but it just wont detect the external Battery i own.

It shows no reaction, when the Battery is plugged in via USB and then turned on.
When the phone is off and the battery is connected and turned on, the phone will boot, but still not charge.

I was trying to find out why the Phone won't accept the Battery so I measured the outgoing Voltage: 6,3 V

Note: 2 out of 2 other phones (1 running Android) detected the battery and charged from it without any issues.

The external Battery was really expensive since it comes with a large solar panel to charge it, so I really ought to get this to work!


Does anyone have any Idea what I can do to force my phone into USB-charging mode? Or how to make it detect the battery?

Greetings,
XxHunterxX

(running 2.3.4 with Gentop, rooted, unlocked)

I know

And I tested today. You must put resistor about 200OHM or just short data pins (2 and 3) in your charger or cable. I really recommend to put resistor. Interested thing is that after phone is connected you can remove resistor and charging will continue.

Thank you VERY much for your effort!

Why wouldn't you recommend just shortening D+ and D- on the Type-A-side? what could happen? Wouldn't that just make the resistance infinitively high?

Also, Why does it work with other phones, if it's the battery's / cable's fault?

I know those are a lot of questions, but I would really apreciate it if you took the time to answer them.

Greetings,

XxHunterxX

Edit: just realised I misunderstood Zeljko. I thought by "short data pins" he meant to clip them off so they couldn't connect to the device :P
Of course he meant short circuiting them^^

Because shorting electronic circuit could damage it. Better safe than sorry. I tested today and even 330kOhm works.

Other phones obviously doesn't care about data pins. Probably Motorola wish to protect phone from low quality third party chargers.

I followed your advice and soldered a 200 Ohm resistor between D+ and D- coming from the Mirco-USB-side.
I just insulated the D+ and D- of the Type-A-USB-side

I actually followed a REALLY useful (German) Guide for things of this type: Sorry It appears I can't post links...

Sadly, I can't test wether it works at the moment, because my phone is being repaired (touchscreen broken).

If you are interested I can tell you wether it works, as soon as I get my phone back.

regards,
XxHunterxX

I know it works, I tested by myself

Could you send me link? I think you can post link around code tag or picture or just figure out somehow

Is your charger a Minty Boost? I have a Minty Boost and it always over heats when i try to charge my Atrix :\

:EDIT: Also I tried shorting out D+ and D- with no avail. It charges but quickly overheats

Originally Posted by heyitsaustin123

Is your charger a Minty Boost? I have a Minty Boost and it always over heats when i try to charge my Atrix :\

:EDIT: Also I tried shorting out D+ and D- with no avail. It charges but quickly overheats

It's cheap chinese charger. I just used it once for testing and I didn't noticed any overheats. I bought it for cycling but I'm traveling a lot and unfortunately I don't have time for long ride.

http://www.ebay.com/itm/280851355387...ht_8694wt_1396

Originally Posted by heyitsaustin123

Is your charger a Minty Boost? I have a Minty Boost and it always over heats when i try to charge my Atrix :\

:EDIT: Also I tried shorting out D+ and D- with no avail. It charges but quickly overheats

If your charger overheats then the worst you can do is short the D+ and D-!
Because then your phone will detect it as a charger and will draw not only 500mA, but even more so your charger will overheat even faster.

You should probably just buy a charger that isn't so cheap