I don't know much about voltage and stuff, but with the 5.3v charger, I assume it's okay to use a 5v to charge the Note 3, it just might be a bit slower, correct?
Now what about using the 5.3v charger on the iPad Air? I can't find any info on its charger, or online, of what voltage it uses. will the 5.3v be too much for it or anything?
guttertrash said:
I don't know much about voltage and stuff, but with the 5.3v charger, I assume it's okay to use a 5v to charge the Note 3, it just might be a bit slower, correct?
Now what about using the 5.3v charger on the iPad Air? I can't find any info on its charger, or online, of what voltage it uses. will the 5.3v be too much for it or anything?
Click to expand...
Click to collapse
It's perfectly fine to use 5v, that's standard. The voltage the wall adapter puts out is not what will determine your charge speed, its the amperage your device draws - which I believe is capped at 1800 mah for the note 3. It doesn't matter what the amperage is (it can be higher), but the note 3 will only draw 1800 mah max and lower if the source is lower. When it comes to the 5.3v charger, there's a bit of mixed information from what I've gathered. Plenty of people have used it with no problems considering .3v is a fairly small difference, but there will be some that tell you otherwise. I personally avoid 5.3v just because I have plenty of alternative chargers.
If the source is lower, it will increase the time it takes to charge. But 5.3 volts as an output will actually drop to 5 once it is loaded by your device. Just like 5 drops to about 4.7 when loaded by a device. The unloaded output of a charger is always higher than when it is connected.
It's the device that determines the amount of charge drawn, the numbers on the charger are just the max-charge it can provide. (Think of it like a car. Your engine can go up to 200Kph, but the actual speed is determined by how much you tell it to give you.)
I charge my Note 3 with my 15V Asus TF700 charger. It still only charges at the max the Note 3 can draw.
Essentially a 15V charger can safely provide the 5V, but a 5V charger can never provide the charge for a device which requires 15V.
Besides, a USB2.0 cable can't go over 5Volt anyway, so your iPad is safe.
ShadowLea said:
It's the device that determines the amount of charge drawn, the numbers on the charger are just the max-charge it can provide. (Think of it like a car. Your engine can go up to 200Kph, but the actual speed is determined by how much you tell it to give you.)
I charge my Note 3 with my 15V Asus TF700 charger. It still only charges at the max the Note 3 can draw.
Essentially a 15V charger can safely provide the 5V, but a 5V charger can never provide the charge for a device which requires 15V.
Besides, a USB2.0 cable can't go over 5Volt anyway, so your iPad is safe.
Click to expand...
Click to collapse
Now I'm not trying to be rude or anything, but I think you have a few facts astray here. If you can prove me wrong I'll be happy to learn since it has been awhile since I took circuits. First off your right about the device being a big factor in the rate of charge, in fact technically the charger is in the device, the wall adapter is just the source. The source will force a certain voltage, i.e. 5v or 15v, and can provide up to a certain current (amperes). The charger in the device then determines how much of this current to draw.
With all that being said, the reason you can use your asus transformer charger is because it only forces 5v unless the transformer is plugged in at which point it kicks it up to 15v. So your not actually plugging a 15v source into your n3, if it were possible you'd be on thin ice. Also, I'm pretty sure you'd be able to charge your asus via say the note 3 charger (really slow though), probably not while its turned on, but turn it off leave it plugged in for a few hours and you should see a change.
A USB cable is just a wire, if you put 5.3V on it then your device receives 5.3V (minus voldage drop due to the resistance of the cable but that's negligible unless you're using a cheap thin cable). That said, 5.3V should be within tolerance for pretty much every USB charging device out there including the iPad (which I think uses a 5.3V charger itself).
Sent from my SM-N900T using xda app-developers app
Cool, good to know I wont fry either device. Thanks for all the help
Solarenemy68 said:
If the source is lower, it will increase the time it takes to charge. But 5.3 volts as an output will actually drop to 5 once it is loaded by your device. Just like 5 drops to about 4.7 when loaded by a device. The unloaded output of a charger is always higher than when it is connected.
Click to expand...
Click to collapse
Galaxy Note 3 have digital charger. so, I don't think undervolting is the case
Sent from Note 3
MILJANN said:
Galaxy Note 3 have digital charger. so, I don't think undervolting is the case
Sent from Note 3
Click to expand...
Click to collapse
It's not undervoltage. The resistance "R" of the USB cable is fixed (varies from cable to cable, but is constant for any single cable), so as the current load "I" increases the voltage "V" lost across the cable also increases, according to V = I*R.
Given a 5v source, loaded to 1800 mA, you would expect to see 4.7v at the phone's end of the USB cable. The resistance of the USB cable itself comes out to around 0.1666666 Ohms in that scenario, which is a perfectly reasonable value for the gauge wire used in those cords.
CalcProgrammer1 said:
A USB cable is just a wire, if you put 5.3V on it then your device receives 5.3V (minus voldage drop due to the resistance of the cable but that's negligible unless you're using a cheap thin cable).
Click to expand...
Click to collapse
Or using a long cable. With my (S5) 5.3V charger, i can finally use those 3M/10ft cables, which is really convenient for me
pizzaman79 said:
Or using a long cable. With my (S5) 5.3V charger, i can finally use those 3M/10ft cables, which is really convenient for me
Click to expand...
Click to collapse
In lieu of using higher voltage chargers to use with long cables, you can also use chargers that provide more current @ 5V or, of course, lower resistance cables.
I'm afraid not. The voltage will drop too far below 5.0V, the device will not accept the offered power, no matter how high the charging current. That's both based on physics and personal experience. Resistance in cables is an issue at 10 metres, even those with high gauge copper cores.
Edit: Delete.
pizzaman79 said:
I'm afraid not. The voltage will drop too far below 5.0V, the device will not accept the offered power, no matter how high the charging current. That's both based on physics and personal experience. Resistance in cables is an issue at 10 metres, even those with high gauge copper cores.
Click to expand...
Click to collapse
You are absolutely correct, however that isn't exactly what I was trying to share. I was trying to share a solution to situations where the charger cannot keep up and thus the voltage sags. I did not expect a 10metre situation. The longest I have is 5m. On my 5 metre cable, I don't notice any appreciable voltage drop from any of my chargers, so I generally consider it negligible. How much do you drop across 10 metres and at how many amps?
On a side note, I think the phone has some kind of safety when it comes to voltages. I just plugged in my 5.3V charger from my s5 into the s3 and it seemed to work fine. However, I also recently, and I only just realised this, plugged in a 7.2V supply to my S3 and though it did not charge, nothing bad seemed to happen. It was an off brand 5V USB Charger and when it died, it cranked up the voltage.
fusionstream said:
You are absolutely correct, however that isn't exactly what I was trying to share. I was trying to share a solution to situations where the charger cannot keep up and thus the voltage sags. I did not expect a 10metre situation. The longest I have is 5m. On my 5 metre cable, I don't notice any appreciable voltage drop from any of my chargers, so I generally consider it negligible. How much do you drop across 10 metres and at how many amps?
On a side note, I think the phone has some kind of safety when it comes to voltages. I just plugged in my 5.3V charger from my s5 into the s3 and it seemed to work fine. However, I also recently, and I only just realised this, plugged in a 7.2V supply to my S3 and though it did not charge, nothing bad seemed to happen. It was an off brand 5V USB Charger and when it died, it cranked up the voltage.
Click to expand...
Click to collapse
The voltage drop is dependant on gauge, copper quality and length. I never measured it at both ends but i estimate 0.3-0.5 volt based on what chargers do and don't charge what phones at 10ft. Note that i mixed up ft and metres lol, my cables are 3m. At that length voltage drop is an issue for me.
7v would perhaps be fine for a 10m cable I wish we knew the tolerance range of what voltages (at the usb in) common smartphones accept.
I think the reason the galaxy tab S tablets have a 5.3volt charger is to compensate a bigger voltage drop through the longer charging cable provided.
The voltage must be the correct voltage or near to it. I think from what others have said 5.3 is near enough to 5.0Volts.
F 0.95
Related
Appologies for duplicating this post here and on the accessories forum but needed a quick answer!
Anyone technically minded who can answer this....
I am using a HTC Touch Pro mains charger for my X1 (as it has a longer cable) which charges the X1 fully.
I did notice the back of the X1 getting a little warm, so double checked the outputs on the original X1 charger and the TouchPro one.
X1 = 5v 700mA
TouchPro = 5v 1A
Is this likely to be a problem?
You should definately not mix power adapters like that. On the other hand they both use mini-USB plugs so if they follow the USB standard (Battery Charging Specification) you are okay. The spec allows for up to 1,8 A, but that does not mean the X1 can take it.
I would have rather bought an extension cable for the X1 charger. Then you are safe _if_ anything happens and you damage your X1. :|
If you need a longer cable, just plug in a standard USB extension cable It will work perfectly and you can extend to plenty of meters if you need to.
Regarding the use of the 1A charger, I don't think it will be that much of a problem, but I wouldn't count on it to cause no problems either. The battery getting warm is not that odd when charging, as batteries generally generate heat when they get charged. The fact that it gets warmer with the 1A, instead of the 0.7A charger, is just because you charge the battery quicker, which in turn causes more heat. You should keep it mind though that heat is a bad thing for LiIon batteries like the X1 uses. Having it being warm reduces lifetime quicker then when it's cool.
maedox said:
You should definately not mix power adapters like that. On the other hand they both use mini-USB plugs so if they follow the USB standard (Battery Charging Specification) you are okay. The spec allows for up to 1,8 A, but that does not mean the X1 can take it.
I would have rather bought an extension cable for the X1 charger. Then you are safe _if_ anything happens and you damage your X1. :|
Click to expand...
Click to collapse
Thanks for your help. I assumed - like you - that USB was USB in regards to power output. But I will take your advice and get an extension and stop using the old one.
Cheers
.
What I've seen on battery charging on mobile phones is that they have an internal intelligent charging system, at least the Siemens and Wavecom systems I've been using.
LiIon batteries are normally charged using constant voltage/constant current until a certain voltage level is reached, ~4.2V for 3.6V batteries. Then the charge current is reduced with a constant voltage until the charging current reaches zero. This implies that from a 5V charger there has to be some sort of internal charging system to make it work.
If you get a charger for USB it is the internal system that handles the current rate, not the charger. The specs on the charger shows the maximum current possible, not the charger's constant charge rate.
So if the phone's internal charging system thinks it's ok with 1A it will use it, but as mentioned earlier, it will produce more heat, but with a faster charging.
Though USB charging specs is limited to 1.8A, most charging circuits is possible to set to less current, with some part charging the battery, the rest powering the phone.
on8a said:
What I've seen on battery charging on mobile phones is that they have an internal intelligent charging system, at least the Siemens and Wavecom systems I've been using.
LiIon batteries are normally charged using constant voltage/constant current until a certain voltage level is reached, ~4.2V for 3.6V batteries. Then the charge current is reduced with a constant voltage until the charging current reaches zero. This implies that from a 5V charger there has to be some sort of internal charging system to make it work.
If you get a charger for USB it is the internal system that handles the current rate, not the charger. The specs on the charger shows the maximum current possible, not the charger's constant charge rate.
So if the phone's internal charging system thinks it's ok with 1A it will use it, but as mentioned earlier, it will produce more heat, but with a faster charging.
Though USB charging specs is limited to 1.8A, most charging circuits is possible to set to less current, with some part charging the battery, the rest powering the phone.
Click to expand...
Click to collapse
Thanks very much that's very informative.
I am wondering if the X1 has this internal intelligent charging system you mentioned. Would be useful to know.
Actually the mA ratings are what the charger can deliver. Not what they actually will deliver. A 700mA rated charger will supply up to 700mA if asked for by the device. This is a two way thing. The charger side will never provide more than it's maximum rating, it's a built in safety thing. The charged side should never ask for more than it can handle, providing that it is a well built piece of electronics. I trust the X1 to be well built on this. USB standards rate a maximum of 500mA for high power devices. The X1 does adapt and thus will charge slower.
Glad this is being discussed; as my X1 is a UK model, I don't have a US wall charger.
I found some on monoprice.com, see under the Power to USB section at the bottom:
http://www.monoprice.com/products/subdepartment.asp?c_id=103&cp_id=10311
They have 3 varieties:
High-Speed WALL Power to USB Female Converter (1000mah) - Black
High-Speed WALL Power to USB Female Converter (1000mah) - White
[**cant tell a discernable difference between those two, but one is larger...**]
WALL Power to USB Female CHARGER Converter - Black (500mah)
[**many people complaining about this not charging their devices; either it really does suck or they didnt get one with enough output**]
I WONT kill the phone picking up a 1000mah?
Anyone else in my situation needing a new US charger, this site has great prices on this stuff... these adapters are under 2 bucks, and USB cables are super-cheap too!
Hello everyone,
I was wondering how far the nexus 4 can be pushed concerning charging...
I noticed normal charger on AC mode goes 1.2A, if you use USB socket of your pc it only charges 0.5A.
What is the maximum of A that the Nexus 4's battery can go? In other words if I took a 2.1A charger How much of that would it actually use?
Thanks
Chargers don't push, devices draw. You could put a 50 amp charger on it, it won't draw any more current than with the stock charger.
Solutions Etcetera said:
Chargers don't push, devices draw. You could put a 50 amp charger on it, it won't draw any more current than with the stock charger.
Click to expand...
Click to collapse
So it can only draw 1.2A physically?
Is it technically possible for the device to draw more?
Is it a physical lumutation or a software limitation?
Not really, Nexus 4 Draw arround 700-900mA even with a
2.1A Charger...!
Artego said:
So it can only draw 1.2A physically?
Is it technically possible for the device to draw more?
Is it a physical lumutation or a software limitation?
Click to expand...
Click to collapse
Given a constant voltage, the load (circuit) determines the current flow.
Think of 85 watt/120 volt light bulb. When connected to 120v outlet, it always draw 85w. No matter if 1 amp is available, or 20 amps, it will always draw the same amount of current.
Unless of course you increase voltage. Voltage is pressure, current is flow. Increasing voltage will push more current given the same load. Of course, increasing voltage can also damage devices that are not designed for it. Try plugging a 12v light bulb into 120v... POP!
The charging circuit inside the phone determines the load that is presented to the supply. The reason it only draws 500ma when plugged into a computer USB port is because the phone is smart enough to know it is connected to a computer because of signal on the data pins (2 & 3). Power is on pins 1 & 4.
Hey all,
I've been using my N10 for a week now and am wondering why and if it's normal for the tablet to require 8+ hours to recharge?
I'm plugging it into the wall using a generic USB cable and non-Samsung power block. Should that matter at all?
Signed 'confused...'
Yes, the charger matters. The stock wall charger is at 2Amps, while a normal USB connection is at 0.5Amps, for example. All devices will charge more slowly on lower amperages, but since the battery of the Nexus 10 is so huge (9000mAh - about double your average laptop), charging it from 0 to 100 will be dreadfully slow, if you're not using a proper charger.
1. Are there other wall chargers with higher Amp output that are safe to use w/ the N10?
2. Is there any long term damage to the battery using a higher or lower Amp charger?
Another issue is if the charger is made for an Apple product it doesn't short the data pins so the Nexus doesn't see it as a high amperage power supply and only pulls .5 amps.
Use the OEM Samsung charger or get one of these:
Ventev r2200 AC Travel Charger, Dual 2A USB Port 110-220v With MicroUSB Cable
http://www.amazon.com/dp/B00BSC7FW0/ref=cm_sw_r_an_am_ap_am_us?ie=UTF8
And if you want a it to charge even faster, use a pogo cable.
Original Pogo Cable for Google Nexus 10 (25% Faster Charge) - MAGNECTOR
http://www.amazon.com/dp/B00D7NZLK6/ref=cm_sw_r_an_am_ap_am_us?ie=UTF8
Sent from my SPH-L710 using Tapatalk 2
garberfc said:
1. Are there other wall chargers with higher Amp output that are safe to use w/ the N10?
2. Is there any long term damage to the battery using a higher or lower Amp charger?
Click to expand...
Click to collapse
Higher than 2.1 amps? Not commercially that I'm aware of, though you could always jerry rig some contraption to deliver more.
The problem is, however, that the device will not draw the extra power. A device will draw the power it can use, and no more. I haven't tested what the draw is on my Nexus 10, but on my Note 2, it never draws more than 1.8 amps (although that reading may be a little inflated and it really only draws 1.5 amps). I suspect it's more or less the same with the N10 and the stock USB cable and Samsung 2.0 amp charger. So if you went nuts and jerry rigged a 50 amp power supply to the device, it would still only draw 1.5 amps.
Note that the draw can be affected by the USB cable you use. I've seen some USB cables draw less than 500mA where the stock Samsung USB cable draws 1.8 amps.
Bottom line is that you're not going to find a wall charger above 2.1 amps as far as I know, and even if you did, it wouldn't charge the Nexus 10 any faster. The problem is what you identified in your original post -- using some plain vanilla 500mA (0.5 amp) micro USB charger that you've had lying around the house for the past several years and assuming that it should charge just as well as the stock Samsung charger. It won't, as you discovered -- the N10 will only draw about a third of what it's capable of drawing from such a charger.
Be careful buying 2.0/2.1 amp chargers from Amazon or wherever, particularly if they're identified as Samsung chargers. They're almost always counterfeit, and no better than the 500mA chargers I mentioned above.
You might also want to look into the POGO charger cable because it allows the Nexus 10 to draw virtually the full 2.0 amps from the charger rather than 1.5.
JasW said:
Higher than 2.1 amps? Not commercially that I'm aware of, though you could always jerry rig some contraption to deliver more.
The problem is, however, that the device will not draw the extra power. A device will draw the power it can use, and no more. I haven't tested what the draw is on my Nexus 10, but on my Note 2, it never draws more than 1.8 amps (although that reading may be a little inflated and it really only draws 1.5 amps). I suspect it's more or less the same with the N10 and the stock USB cable and Samsung 2.0 amp charger. So if you went nuts and jerry rigged a 50 amp power supply to the device, it would still only draw 1.5 amps.
Note that the draw can be affected by the USB cable you use. I've seen some USB cables draw less than 500mA where the stock Samsung USB cable draws 1.8 amps.
Bottom line is that you're not going to find a wall charger above 2.1 amps as far as I know, and even if you did, it wouldn't charge the Nexus 10 any faster. The problem is what you identified in your original post -- using some plain vanilla 500mA (0.5 amp) micro USB charger that you've had lying around the house for the past several years and assuming that it should charge just as well as the stock Samsung charger. It won't, as you discovered -- the N10 will only draw about a third of what it's capable of drawing from such a charger.
Be careful buying 2.0/2.1 amp chargers from Amazon or wherever, particularly if they're identified as Samsung chargers. They're almost always counterfeit, and no better than the 500mA chargers I mentioned above.
You might also want to look into the POGO charger cable because it allows the Nexus 10 to draw virtually the full 2.0 amps from the charger rather than 1.5.
Click to expand...
Click to collapse
Listen to this guy.
@JasW - Wow, thanks for the information / education. It makes a LOT more sense now.
Thanks again, F
@Gearhead_ENG - Thanks for the links! I'm going to go home and scrounge through all my old chargers and see if I have more 2Amp chargers. If not, I'll be following the links again to purchase...
I recently purchased a handful of Monoprice micro USB cables in 3 different lengths. I thought it would be interesting to test the different cables with two different chargers and share the results.
Test Equipment:
Load: Samsung Galaxy Note 2, Custom 4.3 ROM (Carbon), battery @60%
Measuring tool: Charge Doctor (USB voltage and amp meter)
Stuff to test:
Cables: 12", 36" and 72" Monoprice micro USB cables
Charger 1: Samsung 2.0A USB charger (Stock Note 2)
Charger 2: Asus 1.35A USB Charger (Stock Nexus 7, 2013)
Assumption:
Each of the Monoprice USB cables are made with the same gage wire, visually they look the same.
Method:
Phone turned on, camera app loaded, attached the test USB cable photographed the results on the amp meter. I tested each of the 3 cables the same way and repeated the tests with the 2nd charger. Did it all within 10 minutes so that the amount of charge on the phone didn't change significantly.
Results: (See attachments)
Analysis:
- The Asus charger, even though it is capable of putting out 1.35A and even though the phone is capable of accepting at least 1.0A (demonstrated with the Samsung charger), it could only deliver .73A
- The Asus charger seemed to max out at .73A as the 12" and 36" cables had the same results
- The graph indicates the Samsung charger may be able to do better with an even shorter cable
Conclusions:
1) The shorter the cable the faster the charge, but there's a limit
2) The higher amps the charger is capable of, the faster the charge, there must be a limit but I only had 2 chargers to test
3) Duh!
Awesome data. As expected, there is a difference between the current rating on the charger, max current draw on the phone, and actual use, but I didn't expect it to be so much.
I'm curious how much my charger setup gets and concerned that if I did get up above 1A I might overheat my phone. Next test is battery temperature after a few minutes of charging at various currents.
lbloo said:
Analysis:
- The Asus charger, even though it is capable of putting out 1.35A and even though the phone is capable of accepting at least 1.0A (demonstrated with the Samsung charger), it could only deliver .73A
- The Asus charger seemed to max out at .73A as the 12" and 36" cables had the same results
- The graph indicates the Samsung charger may be able to do better with an even shorter cable
Click to expand...
Click to collapse
Scrawson said:
Awesome data. As expected, there is a difference between the current rating on the charger, max current draw on the phone, and actual use, but I didn't expect it to be so much.
I'm curious how much my charger setup gets and concerned that if I did get up above 1A I might overheat my phone. Next test is battery temperature after a few minutes of charging at various currents.
Click to expand...
Click to collapse
Good idea, I even have an IR instant read thermometer, but it'll take more time to test. To give the battery time to heat up I'd assume I'd have to wait at least 5 minutes, then I'd have to let it rest to get back to room temperature, that might take even longer. If I get ambitious I'll do it.
very interesting test....
Easy answer.
It does not.
(unless you have a cable so long, the voltage drop over the cable brings the voltage below 4.75V)
buster_friendly said:
Easy answer.
It does not.
(unless you have a cable so long, the voltage drop over the cable brings the voltage below 4.75V)
Click to expand...
Click to collapse
The tests I did certainly seem to indicate cable length does affect charge rate.
The wire gauge plays a part. Larger and longer should be about the same as smaller and shorter.
But at 5 volt and low amps. It would be hard to measure.
IMHO.
Sent from my XT897 using XDA Premium 4 mobile app
Scrawson said:
Awesome data. As expected, there is a difference between the current rating on the charger, max current draw on the phone, and actual use, but I didn't expect it to be so much.
I'm curious how much my charger setup gets and concerned that if I did get up above 1A I might overheat my phone. Next test is battery temperature after a few minutes of charging at various currents.
Click to expand...
Click to collapse
The source, wiring and connections may limit the current, but so will the phone: don't worry about using a cable shorter than the average mosquito
With most devices you can actually choose between some preset limits (or freely input one) through sysfs...
Basically if u charge with usb cable......it will take more times....
So what amperage do I need to charge a N7 with a 50 foot cable with 4 22 gauge conductors??
hi there. although this thread is old. id like to share my experience on this matter. So i bought a fast charger brand samsung S6. it comes with its own cable. so one day the cable broke so i modified it to be longer. Im using a zenfone 6. the samsung charger blok support up to 2.1A. So the cable now is 5 feet. before i charge my phone from 0% to 100% takes 2.5 hours to fill up. now after enhancing the cable length my phone took 6 hour to fill up from 0% to 100%.
Then i bought a Hp cable that is just around 7cm in length charged my phone and supprisingly it only took 2 hrs to charge my phone from 0% to 100%.. Length does matter LOL!!!
Just sharing, i know its not even a high tech stuff. Am just reviving an old thread thats all.. cheers.
Yes because the flow of current
sent from IT Heaven
---------- Post added at 07:15 PM ---------- Previous post was at 07:15 PM ----------
Becaues the flow of current
sent from IT Heaven
So we just upgraded to Note 3 from our galaxy 3 (wife and I)...
I noticed the charger is a 2 amp charger compared to the SGS 3's 1 amp.
I started reading some threads here and found out the USB 3.0 cable will not charge the phone faster unless it's plugged into the computer.
Apparently the PCM also limits the phone to charging at 900ma. (not verified)
so I'm curious now.... at what amps does this phone charge? I'm trying to get a spare charger to keep in the car, and also trying to get a usb car charger if I can benefit from the 2.1 amp one instead of the 1 amp one that's in there now....
Can anyone tell me if I should get a 2.1amp charger or stick with 1 amp chargers as the spares if it'll still charge at 900ma?
I'm using USB 2.0 cables btw. (unless I can charge faster with the USB 3.0 when plugged to a car charger or the wall, which I apparently won't from my research here)
While I await for responses, I will plug the charger into my voltage/amp reader and we'll see how much power is being drawn, which might give an idea as to how many ma it's charging at.
For whoever that wants to know this information, these are my findings from my meter that is able to measure how much power is being drawn (kill a watt P3)
with the stock charger and USB 2.0 cable (3.0 made no difference) the phone will charge at 900ma with the screen on. If the phone is shut off, or screen is off, it goes to 1500ma. Very steady at those.
with the SGS3 charger that I had, it's a constant 900ma whether screen is on or off... (1.0 amp charger)
now I guess I will have to see if this is the case with any 2.1 amp charger, or if it's specific to samsung's charger with snapdragon's quick charge feature. I believe only certain chargers allow use of this.
I don't know, I'm getting 1800mA by using stock wall charger with USB3 cable and 450 with USB2 cable. I know GS3 would charge at faster rate when using original Samsung wall charger and cable, which had data lines shorted, not sure if it's the same with Note3.
I don't remember for sure, but I think charging rate from computer was pretty much the same 450mA regardless of USB3 or USB2 port or cable. I remember this because I was surprised they didn't take advantage of higher power ratings with USB3, but maybe it was just my particular setup. I used application that shows charging rate, so all is with phone on, but it makes perfect sense, about 2 hours from 0 to 100% charge, if you allow some extra time for trickle charge at the end, losses and usage.
pete4k said:
I don't know, I'm getting 1800mA by using stock wall charger with USB3 cable and 450 with USB2 cable. I know GS3 would charge at faster rate when using original Samsung wall charger and cable, which had data lines shorted, not sure if it's the same with Note3.
I don't remember for sure, but I think charging rate from computer was pretty much the same 450mA regardless of USB3 or USB2 port or cable. I remember this because I was surprised they didn't take advantage of higher power ratings with USB3, but maybe it was just my particular setup. I used application that shows charging rate, so all is with phone on, but it makes perfect sense, about 2 hours from 0 to 100% charge, if you allow some extra time for trickle charge at the end, losses and usage.
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and how did you measure this 1800mA?
razorseal said:
and how did you measure this 1800mA?
program is called galaxy charging current, you can get it in the play store.
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You can't compare that app to a meter that shows you the actual current being drawn
Sent from my SAMSUNG-SM-N900A using Tapatalk
why not? How do you think your meter is working? Phone has similar IC. How did you come up with your numbers first of all? I thought you plug Kill a watt into outlet and it shows what the charger is using at 110v and at about 10 watts(or is it 220-240v for your location), your unit maybe at the limit of accuracy, since the amperage would be somewhere around 100mA, where your device is designed more for larger power consumption like fridge or TV running 300-1000watts and few amps. Is your unit somehow capable of measuring what the charger is outputting and if so, how?
BTW you can't get more than 900mA from PC even over USB3, thats the max limit.
I checked again: galaxy S3 wall charger is giving me 600mA, Note3 charger with USB2 cable gives me 1200mA and Note 3 charger with USB3 cable pumps out 1800mA, computer USB gives 450mA regardless of computer port, but there is something wrong with the USB3 cable that I got, is not connecting properly and I have to wiggle it to connect so maybe bad cable is the reason I don't get higher charge rate from PC USB3.