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since tab charger is 2A output.. will it cause problem if i use it to charger regular phone (most is 1A).
got a tab charger for car, and not sure whether i can use that to charge normal phone as well.
The tab wall charger is specific to the tab. It throws out a differnt amount of power than a regular charger.
I have a regular car cig lighter usb charger and it doez charge my tab.
But the wall samsung charger will not charge any other phone that i have (5 android devices in house total). Neither will my usb tab cord pluged into any of those other phone chargers allow my tab to charge.
Hit thanks if i helped
The Tab USB-charger will have no problems charging other Samsung devices. I use it with my SGS and my SGT exclusively and it works very well. I do not have any experience on using it on other devices, however.
It should be noted that in its original state the Tab won't, of course, be able to charge from regular phone chargers or computer-USB-ports. However it will after under-clocking, much more so after undervolting. I have UCd my Tab to 800mhz and can work with it without problems. Even Gameloft games work fine.
Iam using the Dell Streak 7 as a sat nav system in the car. Ive tried to charge it up on the usb car adapter but it seems to loose its charge over time, making the D7 unusable for the purpose of a sat nav. Am i doing something wrong or is there a special usb car adapter for the job?
Thanks, David.
Does it say it's charging when plugged in?
Depending on how powerful your charger is it's likely that it's draining faster then the charger can provide. At best on my s5 it's just barely faster then the charger and the s7 needs more power then that.
Thanks for peply, yes it states it is plugged in. I came to the same conclusion. Wonder if there are any other chargers that have more juice.
diddy64 said:
Thanks for peply, yes it states it is plugged in. I came to the same conclusion. Wonder if there are any other chargers that have more juice.
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Click to collapse
There are several that will do the job. Just look for specs that include putting out 5.5 volts and 2 amps. Several of the chargers that are made for the iPad2 will work. And you may want to install a lighter adapter that you can wire directly to the battery that will allow up to 2 or 3 amps from each port
Most standard USB ports do not put out enough power to charge the DS7. The best bet is to use a inverter that plugs into your cigarette lighter and then plug the charger into that, not just the USB cable.
http://www.amazon.com/Power-Inverter-Charger-Portable-SmartPhones/dp/B00144KS6W
I use this setup:
Bestek Adapter
Trans4m lighter adapter
The Bestek I have wired to the battery so I have no fuse problems with lighter, and with that I can charge either my iPad2 or my Streak7, IF I need to charge both, then I plug the Transform adapter into the Bestek and can then charge BOTH devices, the Ipad2 AND the Streak7 and a couple of other things if need be
Thank you guys, this gives me alot of hope. Once again you all get my thanks.
Cheers,
David.
Yea, like they previously stated not all chargers are created equal.
Unless it states it's a tablet/ipad charger you cant assume it's doing 2+ amps. Most phone/lower end ones can only do 500mA/1A.
Realistically you'd prob need at least 2 amps to get a net gain while using gps/anything demanding. But I dont know if it would even try and draw above that if given the chance. [email protected] is what the bundled wall charger does and can accept up to 5.5v (as it's still within the +/-10% tolerence of the usb spec, but just barely)
My fully charged stock S7 WiFi running 514 draws only 45-70mA. Maybe starting fully charged would help?
wptski said:
My fully charged stock S7 WiFi running 514 draws only 45-70mA. Maybe starting fully charged would help?
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I don't know anything about how it works, but I imagine tablets are wired to know when they are receiving the correct amount of input. For instance, if you connect your Streak 7 to a powered USB hub that only puts out 5 volts, it won't charge nor will it charge when connect via usb to the PC, it has to be receiving 5.5 volts and 2 amps before it will let itself receive charge. I have an iPad that is the same way and have noticed all the tablets I have had my hands on are the same, Galaxy Tabs, Transformers, Xoom... all those have to receive higher numbers to charge. So you have to have a cigarrette lighter adapter that puts that out, if it's for a cell phone it won't do anything for it
cdzo72 said:
I don't know anything about how it works, but I imagine tablets are wired to know when they are receiving the correct amount of input. For instance, if you connect your Streak 7 to a powered USB hub that only puts out 5 volts, it won't charge nor will it charge when connect via usb to the PC, it has to be receiving 5.5 volts and 2 amps before it will let itself receive charge. I have an iPad that is the same way and have noticed all the tablets I have had my hands on are the same, Galaxy Tabs, Transformers, Xoom... all those have to receive higher numbers to charge. So you have to have a cigarrette lighter adapter that puts that out, if it's for a cell phone it won't do anything for it
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Click to collapse
The voltage is constant but current isn't. It won't know how much current is available unless it asks for it. It's like a 2A fuse, you can draw up to 2A, no more.
Even with a fully charged battery it'll show charging at 98% for a short time and that's when I saw the higher 70mA but I'm not sure if it's in the CC or CV part of a Li-Ion charge cycle but I'd guess CV because it's less than 100mA.
My bad thinking measuring AC input current instead of DC current since this thread is about USB power.
Used a cheap ReTrak USB extension cord that loses connections to seperate the wire to measure DC current. My fully charged S7 showing 100% charge still draws 150mA after hours of being plugged in. Since Li-Ion cells normally don't use a constant trickle charge, I "assume" something draws on the battery all the time along with the indicator light and buttons.
Booting up it draws a little over 1A, fully charged while booted up, it draws around 600mA. While charging and powered up, it draws 914mA. Charging while off, it draws 1160mA. Far from 2A.
wptski said:
My bad thinking measuring AC input current instead of DC current since this thread is about USB power.
Used a cheap ReTrak USB extension cord that loses connections to seperate the wire to measure DC current. My fully charged S7 showing 100% charge still draws 150mA after hours of being plugged in. Since Li-Ion cells normally don't use a constant trickle charge, I "assume" something draws on the battery all the time along with the indicator light and buttons.
Booting up it draws a little over 1A, fully charged while booted up, it draws around 600mA. While charging and powered up, it draws 914mA. Charging while off, it draws 1160mA. Far from 2A.
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Click to collapse
I understand that, but you are missing the point, if the internal wiring of these tablets don't receive the 2A they want they WILL NOT even begin to charge. I tried literally dozens of chargers when I first got my S7, spent a couple hundred bucks actually, and none of the chargers not meant for larger devices won't work, and what those chargers all had in common, 2A output
The S7 can and will draw off low capacity ports, it just wont admit to charging unless it's at least 1A as it's just that.
I've had my S7 charge off a 500mA port on my pc at the rate of like 1%/hour while sleeping. As it's barely gaining even while idleing it's not really charging in the literal sense, but it's definitely charging in the technical sense.
Are your data lines shorted together? I believe most high draw devices wont attempt to pull 2A unless it detects that it's on a high draw charger (which I think do this to indicate it as such)
cdzo72 said:
I understand that, but you are missing the point, if the internal wiring of these tablets don't receive the 2A they want they WILL NOT even begin to charge. I tried literally dozens of chargers when I first got my S7, spent a couple hundred bucks actually, and none of the chargers not meant for larger devices won't work, and what those chargers all had in common, 2A output
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Click to collapse
I don't know why your various chargers didn't work but it doesn't seem to be because of current. It didn't charge at 2A or even close to that.
If what your saying correct, why was I able to charge at less than 2A then? Could this be a ROM issue? I only had Froyo for a few hours but I've read that it didn't support USB charging which came with HC but it only charges with the S7 OFF.
It's possible that the demand went higher and I just didn't see on my current clamp meter. I'll have to try a current clamp and a scope to see if I missed a peak level.
Also what we are refering to as the charger might not be a charger but only a power supply and the actual charging circuit is in the S7.
I did notice one odd thing though. The green LED lights up at around 90% battery level and it's still charging. I downloaded a battery app which read the same level.
wptski said:
I don't know why your various chargers didn't work but it doesn't seem to be because of current. It didn't charge at 2A or even close to that.
If what your saying correct, why was I able to charge at less than 2A then? Could this be a ROM issue? I only had Froyo for a few hours but I've read that it didn't support USB charging which came with HC but it only charges with the S7 OFF.
It's possible that the demand went higher and I just didn't see on my current clamp meter. I'll have to try a current clamp and a scope to see if I missed a peak level.
Also what we are refering to as the charger might not be a charger but only a power supply and the actual charging circuit is in the S7.
I did notice one odd thing though. The green LED lights up at around 90% battery level and it's still charging. I downloaded a battery app which read the same level.
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Click to collapse
You were able to charge because your charger was CAPABLE of outputting 2A at least... try charging with one that CAN'T put that out and you should find that the Streak will not charge, on ANY ROM has been my experience, custom or stock
cdzo72 said:
You were able to charge because your charger was CAPABLE of outputting 2A at least... try charging with one that CAN'T put that out and you should find that the Streak will not charge, on ANY ROM has been my experience, custom or stock
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Click to collapse
Capable is the magic word here. The wall wart isn't putting out 2A from what I've seen, unless it does for a split second at the start which I'm going to look into.
Most wall warts at whatever their rating is put out a higher voltage with no load and slightly higher than its marked voltage under a load. If it required [email protected] max., you used a [email protected], S7 needs more current, the voltage would decrease. What's been stated here might be that the voltage was being pulled down and that's why the S7 wouldn't charge, not "really" the 2A issue.
I have a battery pack/cell load testing device used on RC stuff that connects via USB port for its graphic software. There were issues with certain Dell laptops that had a low voltage at their USB ports.
Maybe starting fully charged would help?
I have the OEM T-Mobile car charger and I've found that if I have a full charge before plugging the Streak into the charger it maintains a full charge for as long as I'm driving/using it. Otherwise, with a less than full charge I've watched it slowly discharge even though it's plugged in and is charging.
FYI: I also have a top of the line car charger for an iPad2 that charges the iPad no matter what charge level I plug it in. This iPad charger has a USB port which I have plugged the Streak USB cord into and it also doesn't keep up with the Streak's discharge if the Streak isn't a full charge to begin with. Kind of strange because I would think the iPad would draw more than a Streak. (the iPad isn't plugged in at the same time the Streak is charging)
DCoop said:
Maybe starting fully charged would help?
I have the OEM T-Mobile car charger and I've found that if I have a full charge before plugging the Streak into the charger it maintains a full charge for as long as I'm driving/using it. Otherwise, with a less than full charge I've watched it slowly discharge even though it's plugged in and is charging.
FYI: I also have a top of the line car charger for an iPad2 that charges the iPad no matter what charge level I plug it in. This iPad charger has a USB port which I have plugged the Streak USB cord into and it also doesn't keep up with the Streak's discharge if the Streak isn't a full charge to begin with. Kind of strange because I would think the iPad would draw more than a Streak. (the iPad isn't plugged in at the same time the Streak is charging)
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Click to collapse
The S7 must run some check before it tries to charge . Whatever it is the OEM supplied power supply passes the test.
What's the specs on your two power supplies?
Just remember if you dont have the same 2A for charging in the car. You cannot charge the streak while its TURNED ON. Same with USB charging, just turn the streak OFF, then charge. It will work. =)
Otherwise, Id get a DC to AC converter for the car, plug in your normal adapter.
Yesterday I've received my Tab S2 8.0". After the first charge I connected the tablet to my computer to upload some files and I get a red "X" on the battery and the message: "Slow charger connected"
In the notification area I get a constant red "Device charging slowly. To charge faster, use the original charger".
Is this normal? Cause I'm using the USB cable that came with the device and tried with USB3.0 and USB2.0 with the same results.
Oh, extra info! The tablet was bought in France, I'm from Argentina.
XinsaX said:
Yesterday I've received my Tab S2 8.0". After the first charge I connected the tablet to my computer to upload some files and I get a red "X" on the battery and the message: "Slow charger connected"
In the notification area I get a constant red "Device charging slowly. To charge faster, use the original charger".
Is this normal? Cause I'm using the USB cable that came with the device and tried with USB3.0 and USB2.0 with the same results.
Oh, extra info! The tablet was bought in France, I'm from Argentina.
Click to expand...
Click to collapse
Yes it's normal.
USB ports cannot put out as much current as a decent charger (like the one the tablet came with). Hence it charges more slowly using USB (or indeed some inferior or lower powered plug-in chargers), and it's warning you that it is doing so. I think the maximum a USB2 port can provide is about 500mA, with USB3 about 900mA or so.
Compare that to the proper plug-in charger, which is 2A (if I remember correctly).
Some motherboards etc do have higher current USB ports for charging etc, but that's non-standard and they are usually specially labelled as such.
Oh, thanks for the help. I got a little scare with the warning.
I got the same tablet, and also noticed this warning about battery charing slowly, and asking me to use original charger.
It's working resonably ok with original charger, though it charges slow with other chargers with the same AMP rating. E.g. it charges slowly with the larger iPad charger, which is also 2 AMP rated ...
Charing with iPad charger is so slow, that when I use the device with during charging, it drains faster than it charges! Quick unusual ...
Anyone? Any comments?
Theres an excellent app called Ampere which gives you info on the tablets charging and power consumption - useful and interesting.
Cant post links yet so just search for it on Play
Also don't forget that (when not built-into the charger) the cable is also important to the amount of current reaching the tablet.
The best charger in the world may well struggle if a long cable with hair-thin high resistance wiring is used to transfer the power into the tablet.
Lastly even though many chargers are labelled as 5v 2A, they may not actually be able to provide that under load, and if things drop when a hungry device like a tablet is connected then things will slow up.
I have a few 5v 2A chargers which come up as slow charging, whereas others which were more purposefully designed (e.g. the 5v 2A charger from my old Nexus 7) work just as well as the supplied Samsung one.
DarrenHill said:
Also don't forget that (when not built-into the charger) the cable is also important to the amount of current reaching the tablet.
The best charger in the world may well struggle if a long cable with hair-thin high resistance wiring is used to transfer the power into the tablet.
Lastly even though many chargers are labelled as 5v 2A, they may not actually be able to provide that under load, and if things drop when a hungry device like a tablet is connected then things will slow up.
I have a few 5v 2A chargers which come up as slow charging, whereas others which were more purposefully designed (e.g. the 5v 2A charger from my old Nexus 7) work just as well as the supplied Samsung one.
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Click to collapse
this is such onfortunate ongoing issue
i got my Tab S2 - SM-T715Y in Thailand as i am backpacking Asia ..
I know the warranty is per country .. so I can not use it where I am now - in Vietnam .. or back home in USA
I realized that this was a major factor before buying .. so I can go through my credit cards extended warranty ..
in the future I will buy Acer or Asus or alike that have international warranty ..
yesterday I was on a road trip
and I was using my 12V car charger
and then a battery bank .. and I think it rigered this problem or fact that I drained my S2 to 0%
fact is that now it is showing "slow charger connected" .. I am using the original charger and cable
now it is slowly *discharging* when connected to AC!!
also will try to whipe the cache..
this is so terrible
I am losing faith in Samsung :/ (had charging issues with my Note 3 .. 8 months in .. motherboard issue)
I can not find a solution to this problem
I am thinking of putting it in a refrigirator? maybe it will do something to the battery?
Not long had this tablet but I have tried 3 ifferent power banks to charge this with no success.
I know there are problems as the Samsung has detection built in which wont allow a lot of other brands to charge it.
I have 3 standard mains Samsung chargers from another tablet and phone plus the original that came with this. Original rated 5v 2amp, other 2 rated 5.3v 2amp. All work fine.
I have an anker 13000mh power bank (2amp output) that charges my s5 phone at 1200mh at super fast speed, it also powered my old tab s 10.5 fast. It will not power this model at all due to the tab detecting it.
Also have 2 beefy jbl charge speakers which can charge anything at 2amps but not this tab at all.
Has anybody found a power bank that works with the T813 ?
Don't care if it has to be Samsung made I just need one that works.
Workaround
Well I sort of have a fix.
I tried about 10 USB cables I had lying around, from other devices such as Xbox one, phones, tablets, speakers, power bank etc.
None of these worked in my anker power bank apart from one.
This is a cable about 6 inch long and it came supplied with a free phone 1a power charger from EE / Orange.
So not ideal but at least I can use the power bank with this device albeit a very short cable.
I have tried to find another cable like this but with no luck, so when this one breaks I'm probably screwed using a power bank unless I pay well over the odds for a Samsung made one if I can find one.
I did try and butcher an old USB cable and tried variations of shorting the data pins, with and without a 10ohm resister but no luck there.
If anyone knows what the difference in these cables is or could give me a pointer as to where I may get one (as long as I know what I'm looking for) it would be greatly appreciated.
As it stands the tests I did on the standard charger and original Samsung cable using an amp meter app I was getting between 1000 and 1500 mA
I was getting pretty similar input from a fully charged anker 5v 2A power bank using this certain USB cable.
I've been having a repeatable problem. I have a Note 9 that will charge faster when I disable fast charging under battery settings. I tested the load being drawn with a USB Power meter these are the results I got.
Using a USB-A to USB-C cable:
When QC is enabled:
Phone draws 0.5amp charge, 10ohms resistance at 5.02V.
When QC is disabled:
Phone draws 1.2 amps, 3.9 ohms resistance, at 5.02V
I am using the same cable, same power bank. The power bank's USB-A port is able to draw ~1.9 amps at 5V, tested using a USB Meter and Load Tester that will put the USB under 1 amp and 2 amp loads at 5V, with resistance being ~2.7 ohms without the power bank turning off. I haven't tested the power bank at 9V, I don't have a 9V load tester
When I immediately switch from QC to non QC, the results above are repeatable.
Things I Have Done So Far:
Reboot Phone
Clear Phone Cache
Reboot Into Safe Mode
Try Different Charging Cables, Blocks, including OEM parts.
Every once in a while, it will switch back to being able to QC fast charge but it is random.
If I use a Power delivery capable block charger, it will charge at ~2750mA (I dont have other numbers like amps, voltage, or resistance, I'm still waiting on a USB-C meter)
My phone's wireless charging has no problem operating at it's max capacity
Any one else have this problem? Anything else I could do before I factory reset my phone?
I posted about losing Fast Charge thru the stock cable a while back and got no answers or a fix. I have not tried turning off the option to see if it charges any faster. It takes almost 2 to 3hrs to fully charge at this point. I'll take any fix or work around at this point.
TokedUp said:
I posted about losing Fast Charge thru the stock cable a while back and got no answers or a fix. I have not tried turning off the option to see if it charges any faster. It takes almost 2 to 3hrs to fully charge at this point. I'll take any fix or work around at this point.
Click to expand...
Click to collapse
Turning off fast charge made my charging a bit better. With Fast Charge (FC) turned on, I was getting 0.5amps (gave around 400-500mA). Turning FC off, sped up my charging by 50%, charging at 1.2 amp (roughly gave me 800-1000mA; Both charges were at 5V). Im able to charge at around 1000 mA with this setup, a little less than wireless quick charge. No idea why turning it off helped.
Another workaround that brought my charging speed WAY UP, to 2500mA, was buying a Power Delivery (PD) capable block WITH A USB-C to USB-C cable. I can get normal fast charging speeds with that setup.
I cant get FC with USB-A to USB-C cables, which is frustrating as most of my charging blocks are the regular USB-A input port.
Hope this helps you. 2-3 hour charge is brutal.
What's even weirder is in my car my phone would barely charge. But since I lost FC at home, it started working in the car. So in my car I can FC but not at home. I even tried the wire I use in the car and still nothing. Idk what is going on
Is it possible that turning off QC is turning off a regulation in the software to keep the battery from overheating? With this regulation turned off that would normally be on when quickcharging, the regulation is not active, thus causing the battery to charge at a less regulated speed, causing charging to be faster? Maybe there's a QC bug currently that's hampering it's full potential? What software version are you guys currently?
I just checked QC on mine on the latest Xfinity version and no matter what charger or cable I use with the function, it is working.
It's def not a software thing. I'm on latest October patch. Samsung told me that they have seen some issue with the charging port and once it goes bad there is nothing to do but replace it. They told me to bring it in to a store for repair thru my carrier. Haven't had a chance to go.
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Jammol said:
Is it possible that turning off QC is turning off a regulation in the software to keep the battery from overheating? With this regulation turned off that would normally be on when quickcharging, the regulation is not active, thus causing the battery to charge at a less regulated speed, causing charging to be faster? Maybe there's a QC bug currently that's hampering it's full potential? What software version are you guys currently?
I just checked QC on mine on the latest Xfinity version and no matter what charger or cable I use with the function, it is working.
Click to expand...
Click to collapse
That what I was thinking. Something is actively limiting the charge coming in. Everytime I had quick charge enabled I've been monitoring the ohms and the resistance would automatically jump to 10ohms. Then I disable QC and the resistance automatically drops to around 6 ohms.
I'm running Android Pie 9.0, Kernel version 4.9.112
TokedUp said:
It's def not a software thing. I'm on latest October patch. Samsung told me that they have seen some issue with the charging port and once it goes bad there is nothing to do but replace it. They told me to bring it in to a store for repair thru my carrier. Haven't had a chance to go.
Click to expand...
Click to collapse
Nocturncal said:
That what I was thinking. Something is actively limiting the charge coming in. Everytime I had quick charge enabled I've been monitoring the ohms and the resistance would automatically jump to 10ohms. Then I disable QC and the resistance automatically drops to around 6 ohms.
I'm running Android Pie 9.0, Kernel version 4.9.112
Click to expand...
Click to collapse
Yeah it could definitely be hardware related as well, due to each pin on a type c charging serving different purposes. There are two specific pins(I think it's two), that are responsible for enabling higher input of electricity. Couple years ago Google made comments about the cheap Amazon knock off cables and why they failed after a short while. Wouldn't surprise me if Samsung cheaped up for the cables and port on the device. I'll have to try and find the articles I read concerning the pins.
Here's a good start to understanding Type C.
https://www.allaboutcircuits.com/te...pe-c-which-pins-power-delivery-data-transfer/
Its the **** cable they supply with the phone.
I had all the same problems.
I noticed that when I turn off quick charge the phone can charge at 5v 1.7 amps. (USB doctor).
When I turn on quick charge it can only charge at 5 volts 0.40 amps.
The phone is trying to charge at 9 volts but for some reason cant so it goes into this safe mode.
I purchased a new Samsung cable it lasted for a week and developed the same problem.
A hint when it develops this problem Dex stops working.
I tried all kinds of cables. One Plus 5, and a few others. I finally got it to work again with my wifes one plus 6 cable.
Im now researching USB Type C ports and USB standard 2, 3, 3.1, 3.2
As well the quick charge tech used by Samsung. Its not Quick Charge 2. Its a proprietary standard.
So if your having problems with quick charge it could be due to your cable or your Port. Things very rarely go wrong with the charger. Also get yourself a USB Doctor. Its a big help. And only costs a few bucks.
Hope this helps somebody out there.
Right now I am trying to compare Note 9 vs Note 20 USB cable.