Database Develop

USB Cigarette lighter chager

I have an old usb cigarette charger - output is 5.5V 500mA. Will this be okay to use with X1 or should I buy an official one?

My 650mAmp charger does it well enough, yours will probably too.

it is the same voltage as usb port so it should work

5.5V or 5.0V?

I use the blackberry lighter charger, 5.0 v 1A
Is it OK ???
I think I got the answer http://forum.xda-developers.com/archive/index.php/t-505222.html

volts is the only thing that matters amps are drawn and a device will draw as much as it's made to be able to the more it can draw the faster it can charge
usb is spc'd to be 5volts but would think that 5.5volt would not cause problems but
once I gave my ext usb hub 12volts and it killed it and many of the devices connected to it

So, using a 5V 500mA just to keep my X1 alive while navigating should be no problem, right? I hardly believe it'll need more.

I use the car charger from my navigation pocket loox by Fujitsu Siemens.
This works great with output 5 V 1 A.
The original charger for home has only just output 5 V and 700 mA.

i never use my sony charger because its not charging properly
i always use motorola charging because its micro usb charger the same as X1. no problem so far

[Q] Need a better charger cable when plugged into my work computer

So to my understanding the 2a that is supplied to our phones when plugged into the wall is due to the wall part and not the cable. Is there any difference in the cables that could provide me a better charge? I leave my phone plugged into my work computer most of the day and it doesnt seem to give it much of a charge. Is this something wrong with the USB port itself (can you systematically change the output provided on your computer? I wonder if t would make a difference in the front vs back usb ports.
Also I am not against getting a nice dock for it while its here at work but I like to keep it in landscape mode. If anyone knows of one available to keep it on with a clock or something and still eb able to charge it I would be appreciative.
Thanks in advance.

The computer usb ports are normally limited to 500mA. The oem wall charger is 2000mA. So you get 4x the current when plugged into the wall. On top of that some chargers have basic circuits in them that the phone recognizes so it knows to pull more current. If you want a fast charge use the supplied wall charger.
Sent from my SCH-I605 using xda app-developers app

i do wonder about this too, as my iphone will charge (sufficiently) thru pc, but the note 2 takes forever

Do they sell or could you make a cable that has two usb plugs on the end, one that will plug into the computer for syncing and one that could plug into the oem wall charger for fast charging.
I would think you could use the two data wires in the usb to connect to the computer and the two power wires to go to the wall charger. Would be really easy to do and only require an old usb cable for the second male USB A end.
Does anybody have any experience with this or know if its possible. The dock seems to have this ability but I would prefer not to purchase an expensive dock.

Some of the more advanced PC motherboards out there have one or two high-current USB ports that can be set for dedicated smartphone/tablet charging. Most of these are Intel Sandy boards as far as I know.
FWIW the Perseus kernel charges far faster IME than the stock kernel.

The iPhone charges "more" than the Note 2 because the iPhone's battery has a smaller capacity. (1440 mAh vs 3100 mAh) so basically every 1% of battery on the Note 2 is over 2% on the iPhone.
ronzza said:
i do wonder about this too, as my iphone will charge (sufficiently) thru pc, but the note 2 takes forever
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A

Before I bought the note, I had a sgs with cm10 and a kernel that supports fast charge. It neglects the pins used for data signal on the usb and makes it a power source only, and I'm pretty sure I got around 1mah with this method though I didn't measure it.
Should be no reason for it not to work on our phones if a kernel supports the method.
Sent from my GT-N7100 using Tapatalk 2

USB 3.0 changes from 2.0
MDavisiw said:
So to my understanding the 2a that is supplied to our phones when plugged into the wall is due to the wall part and not the cable. Is there any difference in the cables that could provide me a better charge? I leave my phone plugged into my work computer most of the day and it doesnt seem to give it much of a charge. Is this something wrong with the USB port itself (can you systematically change the output provided on your computer? I wonder if t would make a difference in the front vs back usb ports.
Also I am not against getting a nice dock for it while its here at work but I like to keep it in landscape mode. If anyone knows of one available to keep it on with a clock or something and still eb able to charge it I would be appreciative.
Thanks in advance.
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Click to collapse
Ok so this is my understanding. If it's a laptop they usually only have one usb port inside. its then run to a hub and from there split to all the other laptop usb ports that you see on the outside. so the power is usually lower than the 500ma. I thought the cable from cableforge.com was bad but it was just the low power from the laptop port.
This said USB 3.0 runs on its own line so it usually works better. now this is where i may be wrong isnt the usb 3.0 more than 500ma?

Excelus said:
The iPhone charges "more" than the Note 2 because the iPhone's battery has a smaller capacity. (1440 mAh vs 3100 mAh) so basically every 1% of battery on the Note 2 is over 2% on the iPhone.
A
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The iphone and most other phones charge "more" because they pulls the entire 500mA that the usb spec allows. For some reason, Samsung phones only pull 96mA over usb. A new cable won't make a difference.

[Q] Droid 4 charging standards

I'm trying to make a fast charging cable for use in the car. The current charger I use seems to work fine, but the coiled cable annoys me. When I use a standard USB cable the charging reverts to slow mode which means the GPS and screen drain the battery faster than the cable can charge it.
The charging cable that works has a resistor between ground and the unused pin 4, but what I want to know, is this the only USB charging standard that the Droid4 supports, for example does it support the one where you put a resistor between the two data pins, or the one where you just join the data pins together?
If it supports either of those, then this project just got a lot easier as I can just chop the Type A connector off my USB cable and do all the work without having to solder a Micro USB connector.

Could you de-solder the coiled cord and solder in a micro USB cord or even a female USB cord for removal of OEM usb... or is that what you mean in the last paragraph... If you want I could give it a try as I have three rapid car chargers and several USB cables...

Lum_UK said:
I'm trying to make a fast charging cable for use in the car. The current charger I use seems to work fine, but the coiled cable annoys me. When I use a standard USB cable the charging reverts to slow mode which means the GPS and screen drain the battery faster than the cable can charge it.
The charging cable that works has a resistor between ground and the unused pin 4, but what I want to know, is this the only USB charging standard that the Droid4 supports, for example does it support the one where you put a resistor between the two data pins, or the one where you just join the data pins together?
If it supports either of those, then this project just got a lot easier as I can just chop the Type A connector off my USB cable and do all the work without having to solder a Micro USB connector.
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I'm not sure if this has anything to do with your question but try an ipad or tablet charger (2.1 Amp) which i use on my droid 4 and charges it fast.
Regular chargers use 0.7 to 1.0 Amp. I know tablet chargers are bulky but they tend to charge your device faster.
Also maybe this thread will work for you: http://forum.xda-developers.com/showthread.php?t=1984838

I'm using a 2amp car charger with a USB socket at the moment and I assure you it isn't charging at that speed. The other charger with the coiled cord does charge at the higher speed, but it also has the odd wiring.
That thread is interesting, is exactly the kind of thing I was talking about, but I'm looking for confirmation that it will actually work with the Droid 4 before I start hacking up cables. The Droid 4 seems to be fussy about which chargers it will work with, my 2amp charger worked fine with the HTC Desire Z, for example.
Another part of my reason for doing this is I want to use the right-angled USB plug that is on my USB lead, but that Micro USB connector is sealed and unmodifiable.

Lum_UK said:
I'm using a 2amp car charger with a USB socket at the moment and I assure you it isn't charging at that speed. The other charger with the coiled cord does charge at the higher speed, but it also has the odd wiring.
That thread is interesting, is exactly the kind of thing I was talking about, but I'm looking for confirmation that it will actually work with the Droid 4 before I start hacking up cables. The Droid 4 seems to be fussy about which chargers it will work with, my 2amp charger worked fine with the HTC Desire Z, for example.
Another part of my reason for doing this is I want to use the right-angled USB plug that is on my USB lead, but that Micro USB connector is sealed and unmodifiable.
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I'm not sure but there is a radio called ihome ic50 (Google it) i own it and it has a special switch which the manual says if the device has a proprietary charging protocol flip the switch. I made a quick test and it charges in both ways. I'm pretty sure your idea will work as long you know what you are doing. BTW the ihome ic50 is pretty cool for any android device.

Charge wont work on computer USB

Ok so my TF701 will charge just fine while connected to the wall charger, but it wont charge at all while connected to a computer. The instruction manual says it will and the general population of users agrees. However when I plug it into my computer the tablet still shows as discharging.
Yes the USB ports work fine. Tried in 4 different computers, nothing.
Anyone have any idea what is wrong?

Thats done on purpose by Asus. It's been like that since the first Transformer Pad

Tab actually requires 12 to 15v to charge - hence the proprietary charger and connector . A usb port only provides 5V.
It will actually trickle charge over USB but it is extremely sloooooooooooooooooooooooooooow. If you use the tab whilst connected to USB it will discharge faster than it can charge.

The stock charger is actually only 5v, it's a USB standard. However the charger produces something like 40watts as opposed to standard USB chargers of 10-20watts.

Charging Issue via Computer

So I'm not able to use the turbo charger at the moment and have it plugged into the computers USB. I just noticed that its going to take nearly 8 hours to charge..is this normal or is something causing the slow charge?

Sorry just realized I posted this in wrong section.

crookone10 said:
So I'm not able to use the turbo charger at the moment and have it plugged into the computers USB. I just noticed that its going to take nearly 8 hours to charge..is this normal or is something causing the slow charge?
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Computer USB only charges at ~0.5 A. if it's USB 2.0 or ~0.9 A if it's USB 3.0. That's opposed to the turbo charger which charges at well over 2 A.

Computer USB ports only supply 500mA for USB 2.0, or 900mA for USB 3.0. However, almost all Android devices determine whether you're plugged into the wall (AC) or a computer (USB) by whether the data pins are shorted together (as they are in android-compatible chargers -- but not iOS-compatible chargers). If the data pins are intact (or missing, like in most charge-only cables) then the device will charge at 500mA regardless. This is why some people experience slow charging with USB 3.0, or some wall chargers (even those rated for 2A).
Update: Just saw someone beat me to the punch a bit, but wanted to make a correction. Turbo chargers (Quick Charge 2.0) CAN charge at 3A, but the Moto Turbo Charger only charges at 1.6A for both 5V and 9V modes, or 1.2A for the 12V mode. Thus, it's not the amperage that's increased but the power (watts).

jt3 said:
Computer USB ports only supply 500mA for USB 2.0, or 900mA for USB 3.0. However, almost all Android devices determine whether you're plugged into the wall (AC) or a computer (USB) by whether the data pins are shorted together (as they are in android-compatible chargers -- but not iOS-compatible chargers). If the data pins are intact (or missing, like in most charge-only cables) then the device will charge at 500mA regardless. This is why some people experience slow charging with USB 3.0, or some wall chargers (even those rated for 2A).
Update: Just saw someone beat me to the punch a bit, but wanted to make a correction. Turbo chargers (Quick Charge 2.0) CAN charge at 3A, but the Moto Turbo Charger only charges at 1.6A for both 5V and 9V modes, or 1.2A for the 12V mode. Thus, it's not the amperage that's increased but the power (watts).
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Interesting, I just assumed the Turbo charger worked at higher amperage. Thanks for the education. :highfive:

gtalum said:
Interesting, I just assumed the Turbo charger worked at higher amperage. Thanks for the education. :highfive:
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No problem. I like to make that correction when I see it, because Quick Charge 2.0 adapters are starting to come out, and it makes it easier to compare them to the (rather expensive) Moto Turbo Charger if know its true specs. For instance, a lot of QC 2.0 adapters don't even have a 12V mode, but run their 9V mode at 1.67A. Since the Moto charger's power is the same in both 9V and 12V modes (14.4W), and the 9V mode of those other chargers actually push 15W, they can charge a bit faster than Moto's charger, although if you just saw the the lack of 12V or the "low" 1.67A rating, you might not catch that.

jt3 said:
Thus, it's not the amperage that's increased but the power (watts).
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P=IV
Amigo.