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  1. Thread Author  Thread Author    #1  
    adam.bean's Avatar

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    Default Need help with chargers - trying to find true 2a chargers that actually work!

    Hey all,I have tried several charger/cable combinations to no avail (with the exception of the $30 Amazon Kindle Fire charger + cable - but this isn't the proper rating). I can not seem to recreate a constant 1900mAh rate that the OEM Samsung charger outputs. All of the below have been tested on two Galaxy S4's, multiple adapters/cables and different outlets. I keep buying and returning multiple cables/chargers to Amazon and I grow tired of it ... I really could use some help. All my tests were done with Galaxy Charging Current app.

    Have tried the following to no avail:
    - The "OEM S4" (Amazon.com: Samsung OEM 2.0 Amp Travel Charger with Detachable Micro USB Cable for Samsung Galaxy Note, Galaxy Note 2 II, Galaxy S3 S III, Galaxy S3 Mini & Other Smartphones (Bulk Packaging): Cell Phones & Accessories) ... that charged at 460mAh.

    - Another "OEM S4" (Amazon.com: Samsung OEM 2.0 Amp Travel Charger with Detachable Micro USB Cable for Samsung Galaxy Note, Galaxy Note 2 II, Galaxy S3 S III, Galaxy S3 Mini & Other Smartphones: Cell Phones & Accessories) that charged at 780mAh.

    - Pwr+ 2A Rapid Charger (Amazon.com: Pwr+ 2A Rapid Charger Ac Adapter for Use with the New Kindle Fire or Kindle Fire Hd Models: Kindle Store), this does charge at 1900mAh; however if you unplug, you have to wait several minutes before you can use it again. During that time the green charge light blinks and it won't output anything.

    - The official Nexus 7 charger (Amazon.com: ASUS Nexus 7 Official Power Adapter: Computers & Accessories) was charging at 1900; however several days later now it won't go past 1480.

    - The "Amazon basics 2.1a" charger (Amazon.com: AmazonBasics Wall Charger with USB Outlet (2.1 Amp Output): MP3 Players & Accessories). Charged at 700 something with a standard USB cable. I then paired with a true charge only cable (Amazon.com: Amazon Kindle Fire 5ft USB to Micro-USB Cable (works with most Micro-USB Tablets): Kindle Store) and it did sustain a 1900 charge. Yet after several days, two of the four chargers I ordered begin to omit an annoying humming noise.

    - The "Amazon Kindle PowerFast" (Amazon.com: Amazon Kindle PowerFast for Accelerated Charging: Kindle Store) + "Amazon Kindle Fire" cable (Amazon.com: Amazon Kindle Fire 5ft USB to Micro-USB Cable (works with most Micro-USB Tablets): Kindle Store) started strong on 1900mAh for the first few days; however is now pulling between 1200 and 1500.

    Then, in regards to car charging ... I found that the official VZW charger actually charges at 1900; however it makes the phone HOT, very very hot. I was able to use this (Amazon.com: New Trent Arcadia Rapiduo (1 pc), 10W 5V/2A Dual Port high-speed USB car charger w/ Free Full Speed Micro-USB Charging Cable (IMP80C/NT80C): Cell Phones & Accessories) combined with a data cable (Amazon.com : Mediabridge USB Charging Cable - (Coiled) - USB-A Male to Micro-B Charging Cable : Charging Only Micro Usb : Computers & Accessories) and it's doing the same thing as the Amazon charger ... was pulling 1900 at first, now at 1200.I am so confused here. Why is it so difficult to get a true 2a/1900mAh charge? I can't be the only one with this problem? I want to say it's the app that is lying to me in regards to the charge; however as soon as I use OEM, right back to 1900.

    As far as pure charging cables go, here have been my experiences:
    - Amazon Kindle Fire @ 1200 - 1900: Amazon.com: Amazon Kindle Fire 5ft USB to Micro-USB Cable (works with most Micro-USB Tablets): Kindle Store
    - PortaPow @ 1100 - 1900: Amazon.com : PortaPow Specialised 5ft 24AWG Charge Only Micro USB Cable for Blackberry, Xperia, HTC One, Google Nexus, Other Fast Charging Devices : Puregear Charge : Electronics
    - Amazon Basics @ 700: Amazon.com : AmazonBasics USB Cable - 2.0 A Male to Micro B (6 Feet / 1.8 Meters) : Computer Usb Cables : Electronics
    - Media Bridge @ 1100 - 1900: Amazon.com: Mediabridge USB Charging Cable - (6 Feet) - USB-A Male to Micro-B Charging Cable: Computers & Accessories

    This is driving me insane!I would truly appreciate any help here.
    Last edited by adam.bean; 07-15-2013 at 07:46 AM.
  2. #2  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Since the OEM charger works, maybe buy another one from Samsung?

    https://www.samsung.com/us/mobile/ce...ries#container
    PLEASE, when asking for help provide as much information as possible. We can't help unless we know what the symptoms are and what you did before they began.
  3. Thread Author  Thread Author    #3  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by meyerweb View Post
    Since the OEM charger works, maybe buy another one from Samsung?

    https://www.samsung.com/us/mobile/ce...ries#container
    Being that I am looking to purchase 4-5 of these, I'd really love to not spend a massive amount of money. That and the OEM has such a small cable that is not desirable. I don't understand why obtaining these chargers/cables is so difficult.
  4. #4  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    I've found on my phones and tablets, using Battery Monitor Widget, that the amperage varies depending on where the battery is in the charge cycle.

    Higher at the beginning and tapering down towards the end.

    I use this to charge my tablet and phone at the same time while driving.


    http://www.amazon.com/gp/product/B00...idcentral00-20

    Also if the charger is designed to be used with anything apple, it probably won't work full amperage on an Android device.

    The MediaBridge charging cable you listed should let you use any charger. Apple or Android.
    Sent from my M470BSA
  5. Thread Author  Thread Author    #5  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Hi Mike,

    I would agree that I have been seeing variability with the amperage with the exception of when I use the OEM charger. I've used several of the aforementioned chargers at random amperage and then moved to the OEM only to see that it was going at 1900.

    I mean, maybe I'm missing something and totally over thinking this; however thus far I have not yet been successfully with properly recreating the OEM charger outside of the $30 Kindle charger + kindle cable which as stated, is a 9v, 1.8a charger ... and it's expensive. That and I haven't had enough testing time with that combo to fully approve it either.

    The media bridge cable gave off more variability than the others. I talked to their customer support and they stated that they have not yet tested out the S4 and it may not be properly working for it as of now.
    fkpalm likes this.
  6. #6  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by adam.bean View Post
    Hi Mike,

    I would agree that I have been seeing variability with the amperage with the exception of when I use the OEM charger. I've used several of the aforementioned chargers at random amperage and then moved to the OEM only to see that it was going at 1900.

    I mean, maybe I'm missing something and totally over thinking this; however thus far I have not yet been successfully with properly recreating the OEM charger outside of the $30 Kindle charger + kindle cable which as stated, is a 9v, 1.8a charger ... and it's expensive. That and I haven't had enough testing time with that combo to fully approve it either.

    The media bridge cable gave off more variability than the others. I talked to their customer support and they stated that they have not yet tested out the S4 and it may not be properly working for it as of now.
    Well, ignoring the amperage being put out by the various chargers, are they charging the phone as quickly as the factory charger?

    Or at least charging in an acceptable time.
    Having less amperage isn't going to harm the phone, it just increases the time it takes to charge.

    Sent from my M470BSA
  7. #7  
    SenseMonkey's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Im usuing the stock charger and to my surprise is able to charge my S4 even faster than the intended amount. There are times when i see that it charges at a rate of over 2 amps per hr. Most of the time it while in using it it charges between 1 amp and 1.9 amps. :thumbup:

    From my Sammy Galaxy S4
  8. #8  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Adam bean.
    This link takes your charger/cable testing to the max.
    :-)

    http://forum.xda-developers.com/show....php?t=2274321

    Sent from my SCH-I535 using AC Forums mobile app
  9. #9  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    I can tell you that the 2A "Samsung" charger from the Android Central store did not charge at 2A, but rather .48A. Ya, it was that bad. I also find it funny that they still haven't posted my 2 star review. I did manage to snag a 2A charger from AT&T though. Also, make sure your cables are up to the job. Not all USB cables will carry 2A as the USB 2.0 spec only calls for .5A.

    This one works as advertised -
    AT&T 2.1A Single USB Low Draw Universal Wall Charger

    This one doesn't -
    Samsung Micro-USB 2A Travel Charger - Android Chargers & Cables
  10. #10  
    Storm_75's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    I too wanted another OEM 2-amp charger, found a lot of "fake" ones on Amazon that claimed to be OEM. Surfed over to the official Samsung store and found theirs, pricey at $39.99. But since I registered my new S4 on their site they e-mailed me a coupon code good for 50% off any one item priced under $50 bucks. So I ordered one, and they must be popular, because they are back-ordered!

    I know the OP said he wanted five of them so this might not help much, but if you haven't registered your phone you might wish to... IIRC it also extends the warranty for three months?
  11. Thread Author  Thread Author    #11  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    As a follow up, the $20 Kindle Fire charger now no longer is pulling 1900, similar to the other chargers that after a few days or so, changed. Now I seem to vary between 1200 and 1500. Crazy.
  12. #12  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by adam.bean View Post
    Being that I am looking to purchase 4-5 of these, I'd really love to not spend a massive amount of money. That and the OEM has such a small cable that is not desirable. I don't understand why obtaining these chargers/cables is so difficult.
    I apologize because I'm at work right now, and don't have my S4 charger here with me, but isn't the cable that comes with it a standard 6 foot cable? Even if not, it seems to be a decent length (Better than the 3 ft. cable that came with my old Thunderbolt!). It should also be noted that per the USB standard anything longer than 6 ft may cause reduced performance.
  13. Thread Author  Thread Author    #13  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    So now both the Nexus 7 and Kindle Powerfast chargers are coming in at 1200mAh.

    I don't get it! Why are these chargers starting at 1900 then days/weeks later then drop down? I'm at such a loss on this and super frustrated. I also went to VZW today to try their chargers ... They have a 2.1a charger that's coming in at 1200 as well.

    The only thing that I just now actually saw is that the OEM charger is 2.0a; whereas all these others are 2.1a. Could this be why? I have now tried basically every charger and cable combo on Amazon and have ended up returning them all.
  14. #14  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    The Galaxy S4 is equipped with Qualcomm's Quick Charge 1.0. This alters the draw of power it will pull from a qualified charger. It is not a linear pull of power. It will pull more or less charge depending on what it needs.

    Pulled from this article: AnandTech | Samsung Galaxy S 4 Review - Part 1

    Samsung appears to implement Qualcomm's Quick Charge specification in the Galaxy S 4 and its bundled charger. I realize we haven't done a deep dive into what Quick Charge is and how it works, but I'll try to go through a quick explanation here. Most conventional chargers are linear, they take a fixed amount of input current (at 5V) and pass it along to the device being charged. The problem is that at deeply discharged states, the device's battery might be at a substantially lower voltage. A traditional linear charger won't change the current supplied based on the voltage of the battery being charged, and as a result can deliver sub-optimal charge times. When implemented, Qualcomm's Quick Charge technology can vary output current based on the voltage of the battery being charged, which results in less power being dissipated as heat and more being delivered to charging the battery itself.

    You've got me curious as to why you need so many chargers. Wouldn't it be easier to just get the Samsung Galaxy S 4 Spare Battery Charger and just swap out batteries as the other one charges? It's only $25 after you register your S4 with Samsung and they send you the 50% off code.
  15. Thread Author  Thread Author    #15  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by dakhath View Post
    You've got me curious as to why you need so many chargers. Wouldn't it be easier to just get the Samsung Galaxy S 4 Spare Battery Charger and just swap out batteries as the other one charges? It's only $25 after you register your S4 with Samsung and they send you the 50% off code.
    I just registered my phone, haven't seen anything for a 50% code?

    Either way, I'd like to have proper charges in different places in my house and at work. In regards to your statement of it will dynamically pull, not sure I can agree. When I plug into the OEM charger, it's a constant 1900; whereas other chargers it starts at 1900 (sometimes), but is usually around 1200-1400. I feel like there is definitely something about this phone and it's incompatibility with any other charger to properly pull a 1900mAh charge.
  16. #16  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    I sometimes use the charger that came with my iPad. It charges the phone quickly! I also have a wall charger from New Trent, that also charges my phone quickly.

    Sent from my SAMSUNG-SGH-I337 using AC Forums mobile app
    Blackberry Storm 1> Blackberry Storm 2> Samsung Mesmerize>Motorola Electrify>AT&T SG3>AT&T SG4> AT&T Optimus G Pro>AT&T LG G2
  17. Thread Author  Thread Author    #17  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Also, it's worth noting ( need to clean up the original post ) but now the nexus and kindle chargers won't even go past 1200 ... how are they progressively getting worse? This is just stupid.
  18. #18  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

  19. #19  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    My oem charger, ipad charger, iPhone charger, car charger all show 1 amp on current widget. .. Never seen 1900 on the oem one that came with the phone. Still charges pretty fast.

    How are you reading the charge current???

    Sent from my SGH-M919 using Tapatalk 4 Beta
  20. #20  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by adam.bean View Post
    Also, it's worth noting ( need to clean up the original post ) but now the nexus and kindle chargers won't even go past 1200 ... how are they progressively getting worse? This is just stupid.
    I mentioned in my post, and others have posted (post #15)
    The chargers and phones/tablets can vary the current and amps they need, depending on where they are in the charging cycle.

    When you're accelerating your car 0 to 60 you use more gas then when you're maintaining 60.

    Sorry, that's a really simplistic example, but close to why your amperage is varying.


    Sent from my M470BSA
  21. #21  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Take a moment and read this article about how the S4 varies its pull of electricity dependent on what it needs. I had linked it in an earlier post and it is where I pulled the quote in red from.
    There is more information I did not mention.
    AnandTech | Samsung Galaxy S 4 Review - Part 1

    Another piece of that review:

    Samsung uses a voltage divider and signals the presence of their own charger by sending 1.2-1.3 V across the D+ / D- pins, this is similar to what Apple does with 2.0 or 2.8 V across the pins for various USB chargers they've shipped over the years. This signaling is essentially Samsung's proprietary tablet charging signaling which they've employed on the Galaxy Note 2 and now SGS4, in fact the two use the same exact charger, so it's worth tossing out your old ones and getting the appropriate one to take advantage of the faster charging.
  22. Thread Author  Thread Author    #22  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by Michael Vieux View Post
    I mentioned in my post, and others have posted (post #15)
    The chargers and phones/tablets can vary the current and amps they need, depending on where they are in the charging cycle.

    When you're accelerating your car 0 to 60 you use more gas then when you're maintaining 60.

    Sorry, that's a really simplistic example, but close to why your amperage is varying.


    Sent from my M470BSA
    Understood; however why is it that only the OEM charger maintains that constant 1900 and the others do not though?
  23. Thread Author  Thread Author    #23  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Quote Originally Posted by dakhath View Post
    Take a moment and read this article about how the S4 varies its pull of electricity dependent on what it needs. I had linked it in an earlier post and it is where I pulled the quote in red from.
    There is more information I did not mention.
    AnandTech | Samsung Galaxy S 4 Review - Part 1

    Another piece of that review:

    Samsung uses a voltage divider and signals the presence of their own charger by sending 1.2-1.3 V across the D+ / D- pins, this is similar to what Apple does with 2.0 or 2.8 V across the pins for various USB chargers they've shipped over the years. This signaling is essentially Samsung's proprietary tablet charging signaling which they've employed on the Galaxy Note 2 and now SGS4, in fact the two use the same exact charger, so it's worth tossing out your old ones and getting the appropriate one to take advantage of the faster charging.
    Similar to my above reply ... I get that, it makes sense, but unless I'm simply not taking enough polls, the OEM charger is always putting out 1900. It's other chargers that appear to be much more variable. So are you stating that it's intended this way? I would expect that all chargers would have the variability ... or if anything, the other way around in by the OEM varies and others are static.
  24. #24  

    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    I think we are all over thinking this issue.

    adam.bean, you are trying to find several chargers to keep your phone fully charged, correct?

    Why not simplify the problem and just get the Samsung spare battery charging system?

    I get a former iPhone user vibe in your need to have multiple chargers everywhere. (Sorry, if this is not correct)
    Which is exactly what you need when you can't replace the battery, chargers everywhere.

    Please remember that the Galaxy S4 is not an iPhone or a HTC One. The battery can be replaced.

    It takes less than a minute to shut down, swap batteries and restart. Now your phone is fully charged back to 100% in just under a minute. Just put the run down battery in the charger and be free to use your phone without being tied down to the charger waiting for it to recharge. Once the spare is recharged in about 2 hours pop it into the travel case and bring it with you. Even using an older charger plugged into the Spare Battery charging system it doesn't take long to fully recharge the spare battery as it is only charging a battery and not powering a phone and charging a battery at the same time. So you can have any type of charger at work, home, or in the car and just plug the spare battery in to charge.
    My phone never has to be sitting somewhere stuck to a charger with this setup only the spare battery needs to be plugged in.
    What's the point in having a portable supercomputer if it is plugged in always charging? I have a desktop computer for that.

    Also, I remember reading that you are pulling your readings from the Galaxy Charging Current app on your phone.
    This may be the source of your frustrations, I don't know as that app does not work on my Galaxy S4 as I have the Sprint variant.
    If I was trying to test chargers I would be using my mutli-meter and take readings directly from the chargers using that.

    I just feel that we are all over analyzing this.
    I just hope this alternate viewpoint is at least helpful in some way.
  25. Thread Author  Thread Author    #25  
    adam.bean's Avatar

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    Default Re: Need help with chargers - trying to find true 2a chargers that actually work!

    Hi dakhath,

    Yeah, i actually keep two extra batteries in my girlfriends purse as she has an S4 too. That was never a problem, it's just more than on demand throughout the day/night, I'd really prefer to be able to charge my phone as fast as possible. We're on the go quite a bit and I'm just crazy about getting the max performance out of any piece of technology. I like to leave the house with a full charge and then rely on the extra batteries when/if need be.

    Yeah, the software may be a culprit, but I fall back to the simple fact that why does the OEM maintain a constant 1900 and all other charges vary?

    At the end of the day, I think I'm just going to settle on the Amazon basics charger and be content with the 1200mAh charge.
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