Can someone tell me why is it that when i charge my phone when USB connected to PC its takes hours together to charge and Wall Charger takes 1/4th of that time why is that can anybody tell me what is the login behind it and which is best way to charge ?
USB only outputs 5v, which is why it takes makes longer. You have more power outputted from the ac adapter therefore it charges quicker. Simple as that. They will both eventually charge the device, but it's recommended you use the wall charger all it's faster, no one likes to wait
+1
U cannot compare usb charging with ur charger as output voltage varies across both n btw usb is jst an alternative for charger it's not a replacement
Sent from my LT22i using Tapatalk 2
You can use a custom kernel and change charging current.
Sent from my GT-N7100
Ok thanks Guys to know what is the main difference
Technically, voltage has little to do with charging. The amperage is what counts. USB on a computer gives ~500 milliamp, where ac chargers give 1-2 amps
Sent from my SGH-I997 using xda app-developers app
For a more detailed answer...
All compatible chargers output the same voltage, 5 volts. (Otherwise they just would burn out the charging circuits in the phone. It can happen both if there's too much volts and if there's too little, but for very different reasons.) However, voltage is not the only characteristic of electricity, the other most important is current, that is, amperes. Think of volts as 'water pressure' and amperes as 'amount of water pumped per minute' through a water pipe -- with real water, those are connected, with electricity they're quite separate.
Every source of stabilized electricity you will find in any kind of power supply will have a set voltage it outputs electricity at, and maximum current it can output. Trying to draw more current than it can supply can damage the power supply, so your phone limits the current it attempts to draw when it detects a standard USB port -- to what the USB standard says it should be able to safely supply. For standard ports, it's 500mA. Galaxy Note II by default plays it safe and draws 425mA. The stock AC charger is rated at 2000mA, and Note draws 1700mA when it detects one. This specifically affects the speed of charging -- AC chargers will charge battery faster, because three times more power gets in.
The USB standard was written before everyone and their mother started using it as a charger, and today, USB ports can usually handle more than 425mA, and on some computers they can supply just as much power as the stock AC charger. There are a few standard ways to detect how much current can a phone safely draw from an USB socket, but not all of them are universally accepted or correctly implemented, so the phone always plays it safe when it can't be sure. If you install a custom kernel, you can directly tell it how much power to draw if you know your USB port can handle it.
:good: :good::good::good::good::good:
aukhan said:
:good: :good::good::good::good::good:
Click to expand...
Click to collapse
You can use the app Galaxy Charging Current (GCC) from the S3 thread which can measure the output of the incoming current. It will also allow you to detect faulty cables and chargers, as you will be able to see different ratings with different cables and chargers.
Testing on typical USB ports will get you a reading of 460, while the original charger and a good cable will give you 1800 (about the max current draw for the Note 2).
If you use a known good charger and get a lousy reading, it indicates a bad cable. I once had a cable give a readout of 100. I promptly threw it away.
Yes i am using that thanks nyways
Related
Hi bringing one charger around would be much convenient. Can i use ipad charger, with 2A output to charge galaxy note?
Tq.
Yes. I've charged mine with it many times.
Hey thanks...
Apple out of norms
Hi
Using a standard USB cable will get you a slow charge, even if the Ipad charger is very powerfull. This is because apple doesn't follow the rules.
Charging your Note may take 6 hours then.
To get fast charge, you need to modify your cable or charger, as stated in this thread : http://forum.xda-developers.com/showthread.php?t=1497864&page=2
jabab said:
Hi
Using a standard USB cable will get you a slow charge, even if the Ipad charger is very powerfull. This is because apple doesn't follow the rules.
Charging your Note may take 6 hours then.
To get fast charge, you need to modify your cable or charger, as stated in this thread : http://forum.xda-developers.com/showthread.php?t=1497864&page=2
Click to expand...
Click to collapse
The increased charge in this mod seems to work for charging via usb port, power from a pc. Charge from main ac lead still higher.
So does charging my Note with an ipad adapter + Note usb cable help increase charge since the ipad adapter has an 2A output??
I'll try to make it clear.
Using a common adapter or any pc USB II or ANY apple adapter will give give you a slow charge with a standard USB to micro-USB 4 wire cable.
This is simply because they can't usually deliver more than 0.5A. For apple, they have a specific standard out of the USB norm.
To go into fast charge mode, the gnote scans pin 2 and 3 of the USB link. If they are short circuited, the gnote tries to go into fast charge mode, and draws up to 1A.
The short circuit of data pins (2 and 3) is specified in the USB norm to state "this adapter can provide 1A"
Some adapters, such as the Samsung one I got with my gnote, already have these pin short circuited inside them and make your phone go into fast charge mode.
If you have an adapter able to supply 1A or more, such as your Ipad's, the simplest way to fast charge your gnote is to have a modified cable. No risk to harm your phone nor your adapter if you respect the wiring.
Sent from my GT-N7000 using Tapatalk
I think i understand now. Thanks so much Jabab.
jabab said:
I'll try to make it clear.
Using a common adapter or any pc USB II or ANY apple adapter will give give you a slow charge with a standard USB to micro-USB 4 wire cable.
This is simply because they can't usually deliver more than 0.5A. For apple, they have a specific standard out of the USB norm.
To go into fast charge mode, the gnote scans pin 2 and 3 of the USB link. If they are short circuited, the gnote tries to go into fast charge mode, and draws up to 1A.
The short circuit of data pins (2 and 3) is specified in the USB norm to state "this adapter can provide 1A"
Some adapters, such as the Samsung one I got with my gnote, already have these pin short circuited inside them and make your phone go into fast charge mode.
If you have an adapter able to supply 1A or more, such as your Ipad's, the simplest way to fast charge your gnote is to have a modified cable. No risk to harm your phone nor your adapter if you respect the wiring.
Click to expand...
Click to collapse
what i want to know is:
if the ipad charger is 2A, will the phone draw all that 2A or just 1A?
im asking because if it designed to work with a 1A charger - is the draw capped at 1A?
Hi
The draw of any phone is limited to its maximum power consumption ie phone consumption + battery charging.
I believe this draw is limited to 1A within the gnote.
Having a 2A charger only means it can provide up to 2A. It's the "pipe" size, in a way.
If there were a way to increase the gnote draw to more than 1A, by example in order to charge the battery faster while using the GPS, this could be :
Either telling the gnote, using a resistor on the 5th pin of the micro-USB plug.
Or using a specific app.
(or both)
I'm not aware of this possibility at the moment.
Sent from my GT-N7000 using Tapatalk
Jabab, thanks for ur valuable expert info. I've notice that charging my gnote with the ipad charger isnt much faster. But charging iphone with ipad charger does gives a great boost. What makes it possible with iphone?
Apple uses a not so different system to tell the iphone or the Ipad that it is connected to a powerful charger: the data pins are connected to the power pins through a ladder of resistances.
I see one main advantage to this: apple could change the resistances values inside the charger to indicate to the device if it is an 1A, 2A or any other current charger.
The main drawback is that this system is compatible with nothing but... Apple devices. This why you get a slow 0.5A charge with a 2A capable Ipad charger.
Sent from my GT-N7000 using Tapatalk
I found the original thread where I learned all this. It may be much clearer than my own explanations.
http://forum.xda-developers.com/showthread.php?t=1384253
I believe though that you need a 1A (1000mA) at least charger to do the indicated mod on the charger for use with a Galaxy Note.
Sent from my GT-N7000 using Tapatalk
I haven't seen anybody mention this yet here on the forum, so I went ahead and bought one and tried it myself.
http://www.amazon.co.uk/dp/B0047AALS0/ref=asc_df_B0047AALS09152658?smid=A1AUCPBF2P18HS&tag=googlecouk06-21&linkCode=asn&creative=22218&creativeASIN=B0047AALS0
This is a USB Y cable. Two USB type A plugs to increase charge capacity from 500mA to 1A.
I use Siyah kernel with STweaks to change USB charge capacity from 500mA to 900mA, I am currently looking for a way to increase this to the full 1A.
Only £3.99 from Amazon. Tested using CurrentWidget. Charging now at 900mA.
danieljamie said:
I haven't seen anybody mention this yet here on the forum, so I went ahead and bought one and tried it myself.
http://www.amazon.co.uk/dp/B0047AAL...de=asn&creative=22218&creativeASIN=B0047AALS0
This is a USB Y cable. Two USB type A plugs to increase charge capacity from 500mA to 1A.
I use Siyah kernel with STweaks to change USB charge capacity from 500mA to 900mA, I am currently looking for a way to increase this to the full 1A.
Only £3.99 from Amazon. Tested using CurrentWidget. Charging now at 900mA.
Click to expand...
Click to collapse
Can't you just buy a 1mA output charger. I have chargers that will fully charger my phone in about 1hr and 30min.
Sent from my SPH-L710 using xda premium
smark72 said:
Can't you just buy a 1mA output charger. I have chargers that will fully charger my phone in about 1hr and 30min.
Sent from my SPH-L710 using xda premium
Click to expand...
Click to collapse
It's designed for PC's and Laptops which only output 500mA on their USB ports.
Would work really well with the KiDiGi Cover-mate Dual Desktop Cradle, too bad it is a tad to expensive seeing that it is just a cable
Hey i have this cable which came with my 2.5 HDD external case. In some places i need to connect both cables to power the HDD so you think it will work same with S3? Also will it not damage it?
Exactly what I was looking for
danieljamie said:
I haven't seen anybody mention this yet here on the forum, so I went ahead and bought one and tried it myself.
This is a USB Y cable. Two USB type A plugs to increase charge capacity from 500mA to 1A.
I use Siyah kernel with STweaks to change USB charge capacity from 500mA to 900mA, I am currently looking for a way to increase this to the full 1A.
Only £3.99 from Amazon. Tested using CurrentWidget. Charging now at 900mA.
Click to expand...
Click to collapse
this was exactly what I was looking for.. Thanks a lot.. I also has Siyah kernel, and many USB 2 ports available at work, and like to keep my AC charger at home.
This cable won't give you 1A. I guess the second USB plug has no data connection (how could it? ) and without a registered USB device a USB port gives only a few mA of power.
It does work with 2.5" harddrives that need more power than one USB port can deliver. Why shouldn't it work with the s3?
But why would you need that when you are charging your phone at work? It's not like you're in a hurry. It can sit there all day.
And I wouldn't try to charge it with 1A or more just to save a little time. The charger you get with the s3 an the s3 itself are made for 900mA. That's why the kernel is limited to 900mA aswell. You might damage your phone by charging it with a higher current. Sure, there is a safety margin build in but going to the limit seldom is a good idea.
weisselstone said:
This cable won't give you 1A. I guess the second USB plug has no data connection (how could it? ) and without a registered USB device a USB port gives only a few mA of power.
Click to expand...
Click to collapse
This was correctly answered back in August (above). What does data have anything to do with current? It simply has 2 plugs so that it can draw more current (mA).
shamez23 said:
It does work with 2.5" harddrives that need more power than one USB port can deliver. Why shouldn't it work with the s3?
Click to expand...
Click to collapse
This.
shamez23 said:
But why would you need that when you are charging your phone at work? It's not like you're in a hurry. It can sit there all day.
And I wouldn't try to charge it with 1A or more just to save a little time. The charger you get with the s3 an the s3 itself are made for 900mA. That's why the kernel is limited to 900mA aswell. You might damage your phone by charging it with a higher current. Sure, there is a safety margin build in but going to the limit seldom is a good idea.
Click to expand...
Click to collapse
No, you can't damage it that way. Electronic devices DRAW current, which means that they only take as much as they are able to. You can plug your phone into a 5A charger and it wouldn't damage it. Too much voltage WILL fry it though.
Are you sure about that?
I've read more than once on tech sites that for example the 2A charger of the iPad will charge other devices that come with weaker chargers faster but that they advice against doing that on a regular basis.
I do use industrial Li-ion batteries (18650) on several other devices and the charger I use for those has a switch with witch I can decide if I want to charge them at 500mA or at 1000mA. Reading in forums that specialize on devices that use those batteries and that have users that seem to know quite a bit about batteries and do extensive testing with sophisticated equipment, the general opinion is, that using lower Amps will prolong the lifetime of your batteries and that too high currents can potentially damage them as of course will overcharging them.
http://batteryuniversity.com/learn/article/ultra_fast_chargers
http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries
I don't know much about battery technology so I might be wrong. I always had problems to wrap my head around anything that has to do with electricity and electronics in general and have to use analogies to understand and explain how things work in that area. Those analogies don't always apply completely.
The one I have in this case is the following:
I decide how much I can eat. I can eat at a normal pace until I'm full but I can also stuff myself and eat a lot more than I would normally do in a short period of time. I know that the later is a bad idea and won't do me much good but it is possible.
If you are correct with what you said, batteries could draw a higher current than what the original charger is delivering, up to their limit but that could still be too much and harm them.
I don't know. Now I'm confused.
shamez23 said:
Are you sure about that?
Click to expand...
Click to collapse
You have a point. I guess it depends on how well the charging circuitry (in the phone) is designed.
The battery itself won't limit the voltage/current (*). It's the charging circuitry that does this. For instance, if you connect the battery directly to a power supply and give it too much juice, it WILL damage the battery. Similarly, if the charging circuitry supplies too much to the battery, then this could also happen. However, it SHOULD be designed with appropriate tolerances and safety margins in mind. Therefore, it depends on how much you trust the hardware.
In that way, I guess charging at 500 mA would be considered safer. That being said, I'm happy plugging my phone into the wall charger every night, whether it's 900 mA or 1A.
(*) I know that Lithium batteries usually have built-in circuitry for safety measures, so they MIGHT have something that limits voltage/current, but I'm not sure.
900mA should be save. After all that's what Samsung gave us.
It's just that some people tweak their kernels to 1.25mA or even more. That's quite a bit higher than the specs and probably close to the safety margin.
It won't even charge your batterie faster that way. At least not when you talk about fully charging it. It will get faster to about 80% charge but after that it will take just so much longer to get to 100% that in the end it takes the same amount of time.
I'll stick to the original Samsung charger or the charger of my old HD2 that I have lying around. Makes me feel safer.
I was thinking about putting a new receptacle with USB and one outlet somewhere on my kitchen counter. Problem is the two better companies have two very different amperage's. Cooper is .7a and Leviton is 2.1a, both have two USB ports and one outlet. The charger for our E4GT is 1a and I also have a Galaxy Tab 10.1 that would need the higher amp version, but many have said to NOT use a higher amp charger than the one our phones came with, which is 1.
So what do you think? Is it really that bad for our phones/battery to charge it using a higher amp source? I know our charger cube is small but I also need it in various locations at home or at the office so having an outlet like this in my kitchen would be awesome.
I hate how slow USB charges our phones, so I assume .7 would still be kinda slow and not charge my tablet either.
http://www.amazon.com/Cooper-Wiring-Devices-TR7740W-K-Combination/dp/B007NC5GI4
http://www.amazon.com/Leviton-T5630...F8&qid=1350409796&sr=1-1&keywords=leviton+usb
My vote is for the 700. It will be better for your batteries over time.
Interesting thing that I have learned is that the Leviton version only pushes the higher amps on one of the USB ports. There is no where that states how much the one that gets less does though and I have read that if you plug in a device that does not need the extra amps that USB somehow puts out less amps and it charges slower.
I need to do more investigating though.
revamper said:
My vote is for the 700. It will be better for your batteries over time.
Click to expand...
Click to collapse
I agree to an extent.
I feel that it really depends on how long you keep your usb charged devices. Battery degradation may not be an issue if you upgrade often or are the type that never has anything older than the 2nd, sometimes 3rd, newest model device on the market. Also, a lot of the newer devices require higher amps to charge at a reasonable time. This transitions into charging habits. On the 0.7A charger, you may find yourself leaving devices on chargers over night potentially hours longer after fully charging. This is arguably also damaging to the battery.
Either way you go, you may find yourself with a bunch of 6' microUSB cables from devices taking forever to charge or battery degradation. :silly:
Your phone is only going to use as many amps as it can. Say a GS2 charges at 450ma USB and 650ma AC. The phone will recognize if its USB or ac and allow it to charge according to that. Its not going to charge faster on a 1a charger unless you root your phone and hack those parameters. Doing that is what will cause battery life problems, if not cause a complete failure of the battery and/or the device.. The higher you you set the charging amperage, the more likely you are to have problems.
And phones now (especially any model of GS2) have circuitry to prevent overcharging. Leaving your phone charging overnight is not going to cause any problems.
I don't know if USB wall outlets act like USB or a/c (think about a USB cable with a wall adapter) but plugging into the USB outlet and checking in the battery info in the settings menu or a battery app can tell you.
Sent from my SGH-I777
What's next wireless charger outlets?
Get the higher-amperage Leviton.
Your device will only draw the amps it needs. The GS2 will draw < 1amp. But if you have a big tablet, they can pull the full 2.1 amps.
Since you're doing a 'permanent' wall installation, you're somewhat future-proofing yourself.
Good info, thanks all. I did not know that our phone will only pull the amps it needs, so that is good to know. I may get the higher amp version because I have a Galaxy Tab 10.1 that needs higher amperage.
i.Sound Portable Charger
Has 16,000 mah
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
I charge a number of things on here...
A friend has me a bit confused saying this could damage the charging mechanisms of the phone.
Any input please?
Thanks
rockky said:
i.Sound Portable Charger
Has 16,000 mah
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
I charge a number of things on here...
A friend has me a bit confused saying this could damage the charging mechanisms of the phone.
Any input please?
Thanks
Click to expand...
Click to collapse
Do u mean, you are giving the Galaxy Note an input of 5V, 2.1A (ie, output of Portable Charger)? if so, it is going to effect the battery life in long run..it may charge your phone faster, but definitely going to hurt the life of the battery..there are a lot of factors which should be considered like how much extra current you can give, temperature etc etc..
I don't think so: charging current is controlled by the device being charged, not the charger.
The Note will draw only ~700mA on an "AC" charger, even if that charger can supply up to 1A, 2A, etc.
On USB, it will draw ~500mA.
A mains/AC charger shorts the 2 data pins, which tells the phone that it's a dumb charger, not a USB host, and it is safe for the device to draw up to its own maximum (700mA for the Note).
---------- Post added at 12:23 AM ---------- Previous post was at 12:16 AM ----------
The corollary to that is that you shouldn't be able to shorten battery life by over-current charging: even with a 2A Nexus charger the Note draws only up to its maximum 700mA.
[I did just that test a moment ago to check: 725mA, on the 2A Nexus 7 charger]
Of course, 700mA is more than the 500mA it will draw from a USB host, so if you were really concerned, you could use that.
But the device ships with a mains/AC charger from which it will draw 700mA, so you're never going to exceed the "official" charger, whatever charging source you use.
cdmackay said:
I don't think so: charging current is controlled by the device being charged, not the charger.
The Note will draw only ~700mA on an "AC" charger, even if that charger can supply up to 1A, 2A, etc.
On USB, it will draw ~500mA.
A mains/AC charger shorts the 2 data pins, which tells the phone that it's a dumb charger, not a USB host, and it is safe for the device to draw up to its own maximum (700mA for the Note).
---------- Post added at 12:23 AM ---------- Previous post was at 12:16 AM ----------
The corollary to that is that you shouldn't be able to shorten battery life by over-current charging: even with a 2A Nexus charger the Note draws only up to its maximum 700mA.
[I did just that test a moment ago to check: 725mA, on the 2A Nexus 7 charger]
Of course, 700mA is more than the 500mA it will draw from a USB host, so if you were really concerned, you could use that.
But the device ships with a mains/AC charger from which it will draw 700mA, so you're never going to exceed the "official" charger, whatever charging source you use.
Click to expand...
Click to collapse
yes, though AFAIK the Note will draw more than 700mA from the OEM charger
and I have noticed charging speed differences by using different aftermarket chargers... never put a multimeter to them though
while charging the battery in the note is safe, I don't recommend plugging in your portable charger into a external battery charger. They may not protect the battery from overcurrent. Pay attention to all the specifications of all charging devices you use. Especially if you also have an aftermarket battery.
Cheers
Sent from my GT-N7000
guitarplayerone said:
yes, though AFAIK the Note will draw more than 700mA from the OEM charger
Click to expand...
Click to collapse
Are you sure? I didn't think that was the case; I could be wrong of course.
do you have any more details on that, please?
I have used many, many USB chargers: mains/AC, 12V, solar, portable battery, and never seen greater than ~700mA being drawn by the Note.
I'd like to know otherwise, for the odd occasion when i might want a really quick charge!
My friends point was that the i-sound charger would hurt not so much the battery but might damage the charging circuitry in the phone...course I learn this after buying this charger! ( I know its fine for nexus 7 and 10.1 tab).
Again its
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
rockky said:
My friends point was that the i-sound charger would hurt not so much the battery but might charging circuitry in the phone...course Ilearn this after buying this charger! ( I know its fine for nexus 7 and 10.1 tab).
Again its
Input: 12V 1A
Output: '5V 2.1A on each connector 2.5 A together'
Click to expand...
Click to collapse
Yup, and I believe the answer is no: you cannot damage the Note's charging circuit by using a charger that has a higher *maximum* current, since the Note will only draw a current of (approx) 700mA regardless of the charger's maximum.
As an example of that, my test showing that the Note still only draws 725mA when connect to the Nexus 7 charger, which has a maximum charging current of 2A.
Thanks
cdmackay said:
Yup, and I believe the answer is no: you cannot damage the Note's charging circuit by using a charger that has a higher *maximum* current, since the Note will only draw a current of (approx) 700mA regardless of the charger's maximum.
As an example of that, my test showing that the Note still only draws 725mA when connect to the Nexus 7 charger, which has a maximum charging current of 2A.
Click to expand...
Click to collapse
There was a mid on this site a really long time ago showing how shorting a specific connection in the usb cable will enable ac mode and this is supposedly what the oem charger does
guitarplayerone said:
There was a mid on this site a really long time ago showing how shorting a specific connection in the usb cable will enable ac mode and this is supposedly what the oem charger does
Click to expand...
Click to collapse
yup, that's right: shorting the two data pins --- which most "dumb-charger spec" capable chargers do --- tells the Note that it's OK to pull its maximum ~700mA. But it won't pull any more than that even if it's a 2A charger.
Without that short, the Note will only pull the regular ~500mA (again, regardless of charger max current): it thinks it is connected to a standard USB host, which might not be able to supply > 500mA, e.g. a laptop motherboard.
If you have a >500mA charger that *doesn't* follow the dumb-charger spec, i.e. it doesn't short the data pins, e.g. possibly a Mac USB charger, then you can get a charge-only no-data USB cable, that has the data pins shorted internally (in the cable itself), which will achieve the same effect. This is the mod you describe above.
You probably should not use that cable with a regular USB host (although the host will probably just limit its current anyway).
[Macs use some proprietary "signalling" method, whereby differing value resistors are placed across the data pins, telling the device differing levels of current to pull, etc. This is why you'll see external battery packs like Anker Astro 3 having a "Samsung port" and also a "iPad port"; madness]
Finally, some Android kernels have a hack that will allow AC mode (e.g. 700mA on the Note) regardless of the data pins. But this isn't always wise, and so many devs won't touch it. It prob wouldn't bother the Note, but it might not be good for the host/charger.
Apologies for rambling on, but people seem to ask this sort of thing a lot...
yep people wantblong battery life and fast charge.
About time a proper fuel cell is introduced
Sent from my GT-N7000 using Tapatalk 2
Most of this is over my head
So bottom line: charging my note with the i-Sound charger described in the OP will NOT damage my new Note , correct?
Tnx
rockky said:
Most of this is over my head
So bottom line: charging my note with the i-Sound charger described in the OP will NOT damage my new Note , correct?
Tnx
Click to expand...
Click to collapse
I believe that's correct; I would not hesitate to use it.
As someone else stated, however: whilst charging in the phone should be safe, since the phone controls the current, taking the battery out and charging it in a standalone battery charger may not be safe.
rockky said:
Most of this is over my head
So bottom line: charging my note with the i-Sound charger described in the OP will NOT damage my new Note , correct?
Tnx
Click to expand...
Click to collapse
Yes, that's correct. Generally, just make sure the voltage is not too high (or too low). The range of 4.7V to 5V should be OK, since there is some allowance for variations. The current ( ie, the Amperes) only indicates the current the charger is capable of supplying. It doesn't mean the charger will force all that current down the battery's throat. The device/battery will draw as much as it needs, and this will not damage the device or battery whether it's 0.5A or 2A.
Hey!
I noticed recently that my G5 charges quite slow. So I tested all of my powerbanks, cables, and wall chargers, in various combinations. I had 4 different powerbanks, 3 wall chargers, and 4 cables.
I used a USB ammeter to measure the power draw going through the USB cable.
On the motorola charger and cable that came with the phone, it charges at 1.8a. I then charged my phone from each powerbank and wall charger, using each cable in turn. The average charge speed for my phone was about 0.5a. Out of 28 combinations, only 2 yielded a draw over 1a.
I have created a spreadsheet detailing the charge speeds of each combination, but unfortunately cannot post it yet (10 post permissions).
I then charged my USB powerbanks from the same wall chargers, using the same cables. One powerbank charged at over 1a with every combination, and reached over 2a on numerous combinations. This proves that the cables and wall chargers are not at fault, it is a phone issue.
Why? Has motorola put something in their chargers that 'talks' to the phone, and allows for faster charge speeds? 0.5a is awful!
Secondly, does anyone know of cables that I can buy, which will support fast charging for the motorola? I have looked at genuine motorola cables, but there is no way to tell one from the other.
Thanks!
Paul
P.s. charge speeds were the same, whether the phone was switched on or off.
Welcome @agour
I've come up to a similar conclusion with a lot less data (thus I didn't share them).
I caught power consumption at the wall outlet when charging my device with two chargers: Motorola stock charger and a Samsung Adaptive Fast Charger.
The Samsung has the following specs: 5V 2A or 9V 1.67A with fastcharging capable device.
Using Samsung Adaptive fast charger and Samsung 1.5m cable : 6W, so the device charges at something like 5V 1.2A...
Using Samsung Adaptive fast charger and the cable provided with my XT1676 : 11.3W (which is coherent with the max 9V 1.6A, and would mean the charger provides 2.2A if at 5V which more than the specs.)
Using stock charger and stock supplied cable : 11.3W ==> fast charge for similar reasons as above
Using stock charger and Samsung 1.5m cable : around 6W ==> low power charge
I'd need a USB multimeter to confirm those data. (mostly due to the variable voltage that can provide fast charge adatpers)
matmutant said:
Welcome @agour
I've come up to a similar conclusion with a lot less data (thus I didn't share them).
I caught power consumption at the wall outlet when charging my device with two chargers: Motorola stock charger and a Samsung Adaptive Fast Charger.
The Samsung has the following specs: 5V 2A or 9V 1.67A with fastcharging capable device.
Using Samsung Adaptive fast charger and Samsung 1.5m cable : 6W, so the device charges at something like 5V 1.2A...
Using Samsung Adaptive fast charger and the cable provided with my XT1676 : 11.3W (which is coherent with the max 9V 1.6A, and would mean the charger provides 2.2A if at 5V which more than the specs.)
Using stock charger and stock supplied cable : 11.3W ==> fast charge for similar reasons as above
Using stock charger and Samsung 1.5m cable : around 6W ==> low power charge
I'd need a USB multimeter to confirm those data. (mostly due to the variable voltage that can provide fast charge adatpers)
Click to expand...
Click to collapse
Interesting! It's suprising how much difference the combinations can make.
I don't think I have experienced this on a phone before, however I have never felt the need to test it...
I tested the original cable that came with the phone, and an off the shelf 'genuine motorola cable'. The stock cable is still the fastest, however the secondary cable still worked very well.
Interestingly, one of my powerbanks will charge at 2.2a from pretty much EVERY powersource and cable combination. This is with 7 cables tested, and 3 USB wall adapters.
Shame that motorola doesn't allow their phones to draw maximum power from hardware that can provide it..
agour said:
Interesting! It's suprising how much difference the combinations can make.
I don't think I have experienced this on a phone before, however I have never felt the need to test it...
I tested the original cable that came with the phone, and an off the shelf 'genuine motorola cable'. The stock cable is still the fastest, however the secondary cable still worked very well.
Interestingly, one of my powerbanks will charge at 2.2a from pretty much EVERY powersource and cable combination. This is with 7 cables tested, and 3 USB wall adapters.
Shame that motorola doesn't allow their phones to draw maximum power from hardware that can provide it..
Click to expand...
Click to collapse
If I have some time, I may test internal impedance of the cables, it is possible that the device somehow probes the cable (or the cable + charger) and then decides if it can or not draw that much power without overheating/melting the cable; and then it will negotiate the quickCharge with the charger.
there has been a discussion about quick charge on this thread a while ago (before I got this devices : https://forum.xda-developers.com/g5/help/quick-charge-3-0-support-t3632457)
Lenovo adds the following that I have not tested:
Lenovo said:
If your device is below 78%, but it does not begin Turbo charging when you plug it into the Turbo Charger, try uplugging and plugging back in using one fluid motion.
Click to expand...
Click to collapse
[Source]
It is quite obvious that especially cheap cables will charge phones much slower as the resistance is too high, even if the phone does not perform any checks. Those cables are basically too thin. Resistance limits the current (amps) that can flow. Newer phones most likely just look at the charge current during the first x seconds (or less) and then decide wether to enable fast charging or not to keep the cable from heating up. A wire with high resistance is basically a heater. So it's a necessary safety feature (from the companies POV).
Regarding the power bank, it may be possible that this particular design provides a voltage slightly higher than the nominal 5 volts (still fine for most devices), which helps overcome the resistance. That is also the reason why the Samsung fast charger provides 9V: You don't need a cable as thick as with 5V.
Keep in mind that the USB specifications only recently got updated for such high charging currents, so it is advisable to use only the cable that comes with the phone as USB cables in general don't need to provide such high currents by spec!
71n4 said:
It is quite obvious that especially cheap cables will charge phones much slower as the resistance is too high, even if the phone does not perform any checks. Those cables are basically too thin.
Resistance limits the current (amps) that can flow. Newer phones most likely just look at the charge current during the first x seconds (or less) and then decide wether to enable fast charging or not to keep the cable from heating up. A wire with high resistance is basically a heater. So it's a necessary safety feature (from the companies POV).
Regarding the power bank, it may be possible that this particular design provides a voltage slightly higher than the nominal 5 volts (still fine for most devices), which helps overcome the resistance. That is also the reason why the Samsung fast charger provides 9V: You don't need a cable as thick as with 5V.
Keep in mind that the USB specifications only recently got updated for such high charging currents, so it is advisable to use only the cable that comes with the phone as USB cables in general don't need to provide such high currents by spec!
Click to expand...
Click to collapse
That sounds correct, although my Samsung wall adapter is fast charge capable, and was provided with a cable (and not a cheap one), that basically can't be use for fast charging with the G5, that looks silly...