Qualcomm’s Quick Charge 2.0 technology explained

by: Rob TriggsNovember 6, 2014
3.1K

With battery life still struggling to accommodate the needs of heaviest smartphone users, reducing charging times is the next best thing. Qualcomm’s Quick Charge technology aims to do just that. The latest 2.0 version boasts up to 75 percent faster charging times than standard devices and HTC states that using the Rapid Charge 2.0 adapter states, you can charge your smartphone to 60 percent in just 30 minutes.

Quick Charge 2.0 is built in to all of Qualcomm’s latest SoCs, meaning that most of us should be able to benefit from faster recharge speeds. However, can you expect such impressive sounding battery charge times in all situations?

How it works

Before we begin, a quick note on batteries in general. Essentially, batteries are charged by the current delivered to them by the power source. Applying additional current at a set battery voltage results in more power, which can result in faster charging but also requires sturdier charging components that can withstand high power levels. Different amp specifications on different charging adapters alter the time it takes to charge your phone, but there’s a maximum limit to how much current can be pushed through.

Receiving devices, such as smartphones and tablets, include regulator circuits that will limit the charging current to prevent too much power dissipation and therefore potential damage. Charging sources, such as mains adapters, take mains power and convert it into a form that usually doesn’t exceed the maximum specifications of the device being charged. With smartphones, your adapter takes a high-voltage AC supply and converts it to 5 volts DC with a maximum amount of current draw.

Qualcomm’s Quick Charge 1.0 technology was designed to maximise charging efficiency for up to 10 watts of power, by allowing for a maximum current draw of 2 Amps through a standard USB adapter and port voltage of 5 volts. Quick Charge 2.0 allows for an even higher level of power transfer between your power source and smart device, up to a maximum of 36 watts in certain scenarios. Qualcomm splits its 2.0 technology into two classes, A and B. We’re most interested in Class A, which applies to smartphones, tablets, and other portable electronics.

Qualcomm Quick Charge

The specifications for Class A allow for a maximum charging current of 3 Amps, depending on the source. Your typical smartphone charger will run at 5 volts, drawing 3A of current boosts Quick Charge 2.0 up to 15 watts of power. This means that you can draw more current from a traditional 5 volt USB supply, thereby speeding up the charging time.

Class A devices will also work with 5, 9, or 12 volt supplies and can therefore tolerate more power. The range of higher voltages means that a single charger can work with a wide range of devices and also ensures high quality performance by reducing the impact of any voltage losses that appear over long cable distances or poor quality cables.

 Quick Charge 1.0Quick Charge 2.0
Voltages5v5v / 9v / 12v
Max Current2A3A
SoCsSnapdragon 600Snapdragon 200, 400, 410, 615, 800, 801, 805

Qualcomm’s Quick Charge 1.0 and 2.0 technologies are also backwards compatible with one another, meaning that you can use a 2.0 devices with a 1.0 supply, or a 1.0 device and 2.0 supply and get your 2 Amps. However, only a 2.0 device and compatible 2.0 charger will allow for 3 amps of current and higher power ratings.

Charging from your laptop

Despite the promised speeds and current capabilities, there are some limitations imposed by the USB standard itself. The commonplace USB 2.0 standards deliver just 0.5A of current, while newer USB 3.0 ports bump this up to 0.9A and also lays out a specification for dedicated charging ports which can provide 1.5A of current at 5 volts. Although you’re unlikely to find many home computers making use of this. You may have noticed that this doesn’t max out Qualcomm’s latest specification and that charging speeds will depend entirely on which ports your computer or laptop has. You also won’t notice a difference in charging speed from your laptop between Quick Charge 1.0 or 2.0, as USB ports can’t yet reach 2 amps of current.

 USB 1.0USB 2.0USB 3.0USB 3.0 Battery Charging (no data)USB 3.1 (Power Delivery 2.0)
Voltage5v5v5v5v5v / 12v / 20v
Max Current0.15A0.5A0.9A1.5A5V at 2A, 12V or 20V at 5A

Qualcomm’s Quick Charge 1.0 and 2.0 both allow users to grab the most current possible from standard computer USB ports, but you can’t bypass the limitations imposed by the source. If you want even faster charging, you will still need to connect up to the mains.

Why do I need a new power adapter?

If you check the current rating of the mains adapter that came with your smartphone you will probably find that it is rated anywhere between 1 and 2 Amps, depending on its age. Quick Charge 2.0 can juice up from a maximum of 3A, so you will need a mains plug source capable of outputting a higher amount of current than your typical phone charger to make full use of the technology.

Quick Charge 2.0 will technically work with any USB adapter capable of outputting 3A or more at 5 volts and will simply limit the current to the maximum allowed. As we said before, Quick Charge 1.0 handsets will be limited to 2A even from a 3A mains plug and other smartphones will have their own lower limits too. Other phone’s won’t necessarily work with higher current adapters or other cables, as they can be fooled into thinking they are connected to USB rather than the mains and limit their own charging speeds. This isn’t a problem with Quick Charge enabled devices.

Don’t worry about branding

Various smartphone manufacturers each have their own adapters aimed at improving charging times, but the truth is that these are mostly cross-compatible.

Motorola’s Turbo Charger and HTC Rapid Charger are essentially both just offering up 3 amps out of the wall at 5 volts, and will work with any Qualcomm smartphone with Quick Charge 2.0 technology. The key point to look out for is that both chargers list Qualcomm’s technology specifically, so you won’t have to change chargers if you buy a new smartphone.

Quick Charge compatibility

Don’t worry about the branding, Quick Charge 2.0 adapters are universal.

While there is currently only a small selection of Quick Charge branded adapters, the technology is actually rather universal and you can make use of quicker charging times providing that you have a compatible smartphone and a charger capable of supplying enough current.

As Quick Charge 2.0 is a feature of Qualcomm’s Snapdragon 800 series of SoCs, pretty much every major flagship smartphone will be supported. The recently announced HTC adapter will technically work with any and all of the Quick Charge 2.0 and 1.0 enabled smartphones. You can double check for support on Qualcomm’s official website under your smartphones specifications.

  • Shashank Bhardwaj

    Of course Quick Charging is going to help immensely and everything. But if you ever have to focus on the source of the problem, it’s battery-hungry apps. These 5 specially, they kill your battery brutally – http://goo.gl/aWCP69

  • vernonX

    So nexus 5 can be “quick charged”?

  • Anonymousfella

    Qualcomm is killing it in the mobile market..

    • balcobomber25

      Not anymore…

      • DT

        Because Samsung is putting their own chips in their own phones?

        • Qasim57

          Samsung’s chips also use Qualcomm QuickCharge.

          For example, the Note 5 uses QC2.0

          • DT

            You’re vastly misunderstanding the point.

  • Christopher Moore

    Step 1: Power off Note 4 (10 secs)
    Step 2: Remove rear cover (10 secs)
    Step 3: Pop out dead battery (5 secs)
    Step 4: Pop in fully charged battery (5 secs)
    Step 5: Replace rear cover (10 secs)
    Step 6: Power on Note 4 (20 secs)
    Step 7: Laugh at people that are tied to chargers (for as long as I own a phone with a removable battery)

    • John Johnson

      Step one: Plug my phone in at night.

      …..and done.

      (I suppose I could laugh at the people who cannot seem to make it through an entire day on one charge, but I’m not really that much of a jerk.)

      • Christopher Moore

        Step zero: Forget to plug phone in at night. Failed!

        It happened to me a few times before I got fed up and just spent the money on the battery kit.

        • John Johnson

          Some folks need ’em – some folks can get by just fine without ’em.

          (The non-sarcastic version of my original reply…)

        • Abbas Mustafa Bhaiji

          Step -1: Forgets to keep extra battery for charge (Doesn’t know)
          Step 0: Forget to plug phone in at night.
          Steps 1-7 : Replace battery succesfully
          Step 8: Checks battery percentage and sees 20%

          LOLOL

          • kam hagh

            step 1: stop fighting
            step 2: some ppl may not like changing the battery some may do many phones don’t have removable battery !
            step 3: i prefer a power bank. But don’t have one :D
            step 4: i always bring a charger with my self (i have nexus 4)

          • Rexford L

            set my phone on the night stand next to my bed.. on the wireless charging plate, no plugging anything in.. wake up in the morning, it’s charged..

          • DT

            Or, step -1, forgets specialty charger for second battery when going on a trip, renders backup batteries useless.

          • disqus_FYINAKV4CU

            Step 1: Buy a zerolemon battery rated at 10,000 mAh. Step 2: Charge your phone whenever you get around to it. lol

          • Abbas Mustafa Bhaiji

            How did you come across something that is one year old?

          • disqus_FYINAKV4CU

            I was researching “quick charge 2.0 damage ” in reference to the battery life on 2 different batteries i have on my note 4. One battery is only good for 25 min charge! The phone was killed either from so much quick charges or a battery cradle and battery set i bought on ebay. The cradle may have overcharged it ruining it over time. Its been known that the quick charging may shorten the battery life of phones. Mine was down to 25 maybe 20 min. Pretty bad. I bought a zero lemon battery to help but its too bulky to have all the time. Just for special occasions.
            A sprint rep gave me a new battery free and my phone is like the day i got it out of the box with 40-50% by 2pm. Was just googling to see if there were other stories and came across this article.

          • Abbas Mustafa Bhaiji

            Lol

      • Android Developer

        Isn’t it considered wasteful to continue charging the device even after it gets to 100% ?
        Doesn’t it also lower the battery life this way?

        • AnonGuy

          No. The phone usually will charge to 99% and report 100%/Fully Charged. It then limits current from going into the battery whenever the battery is full to prevent overcharging.

          • Android Developer

            Nice. Is this available on all devices nowadays? Also, when did it start working this way? Is it also this way for my device (SGS3 ) ?

          • KyranF

            You call yourself Android Developer, yet do not even understand the hardware. Lithium Ion/Polymer battery charger ICs on the PCB of the phones (yes, all phones with rechargeable internal Lipo batteries) have a constant current/voltage charge cycle, and when the battery reaches full charge there is essentially zero current going into it. The charge is terminated, and depending on the IC the charge process will restart or a maintenance top-up will begin if the phone is left connected and the battery levels drop below a certain point (usually 95-98%)

          • Android Developer

            A developer isn’t necessarily someone who understand in hardware, batteries or even electricity. Those are completely different subjects. Also, being curious and not afraid to ask questions is a good thing and not a bad one.
            I’ve learned in a university for a computer-science degree a long time ago, and I don’t read a lot about hardware. I read a lot about software, and even then, mostly things that are related to what I work at (Android development).
            Please try to be more understanding and tolerant next time.

            About the explanation, thanks.

          • KyranF

            Alrighty then! You should delve a little further into hardware if you can though, if you get time in the future.

          • Android Developer

            Sure. It can help in many ways to learn about hardware. Can’t learn everything of course… :)
            You know, even focusing on software doesn’t mean I know everything. I don’t know, for example, about writing in OpenGL ES 2.x (though I learned about v1.x, yet it’s completely worthless now since it’s very different), and I really wish I had time to learn it. I’ve seen amazing stuff people can do for games and wish I’d do something myself too.
            For now, I focus on “normal” apps. I’ve made this app on my spare time:
            https://play.google.com/store/apps/details?id=com.lb.app_manager

          • Samarjit Singh

            I am yet to see a battery that charges 100%. none of them does that. with age charge holding capacity decreases so if your new cell battery holds 2000 Mah within 100 charges it will decrease 100 Mah, maximum charges you can get from Li-ion is around 500/600 and Li-po around 1000.

          • Android Developer

            Yes, that’s too bad. How about the new Graphene batteries that never arrive? What do they promise ?

          • Samarjit Singh

            Carbon implementation in tech is never easy. i guess we have to wait for some time although i have a doubt that it wont be cheap though a battery maybe able to hold 20000 Mah of the same 2000 Mah li-ion size.

          • Samarjit Singh

            sorry i typed 20000, i meant 200,000 Mah lol but almost impossible to mass produce if any use would be in processor sockets instead of Gold but that too is far fetched

          • Android Developer

            That sounds amazing. Can you show a link about this?

          • Samarjit Singh

            It is just a patent as of yet as other 8000 patents are there for graphene related experimental tech. just goover to the site of National Graphene Institute, Manchester and try to find out. I read a paper about it 3 years back i think.

          • Android Developer

            seems like it’s taking forever to be available for everyone, like a lot of other technologies in the past.

          • SirDaShadow

            These are the developers who code their apps with complete disregard of battery life, then you wonder why people aren’t using your app…

      • Seb

        Exactly! I will never understand how people NEED a removable battery. I have owned smartphones for YEARS and I have never ever forgotten to charge it. Besides, now with quick charge on my s6 I don’t even charge it at night. I plug it in while I get ready in the morning and voila! It’s charged when I’m ready to leave. Also, is someone really going to tell me they spend 24 hours straight without having access to an outlet??

        • DT

          I thought I needed it until Motorola took it away. At the time, Samsung was still making chincy plastic shit, so I had to get a Moto if I wanted build quality. Never looked back (it helps that they had the MAXX variants)

        • disqus_FYINAKV4CU

          I don’t NEED it. I WANT it because I don’t want to wait for my phone to charge!

      • DT

        Step one: drop phone on Qi Charger at night.

    • Terry Barnhill

      Step 1: Unplug Droid Turbo in the morning
      Step 2: Use all day including seven hours of screen on time
      Step 3: Plug phone in when I go to bed with 15% battery left
      Step 4: Laugh myself to sleep thinking about people who have to charge and carry spare batteries

      • Jacob Koehler

        You only get 7 hours of screen on time? With a 3900 mAh battery is expect more… My OnePlus One gets 6.5 hours screen on time and it has a bigger display and much smaller battery. That QHD display is a battery murderer!

        • Terry Barnhill

          Yeah 7 hours of screen time and 24 hours off charger. Phone arenas battery test rated the turbo higher than the one plus.

        • s2weden2000

          It’s a amoled screen..it draws less than any lcd/ips on the market…

          • fioren

            You don’t know what you’re talking about.

            It’s nothing to do with Amoled/LCD. The GPU is what consumes much more power with the QHD screen resolution.
            And don’t forget that Amoled is going to burn in!

          • s2weden2000

            Not anymore…

          • fioren

            It’s still valid.

          • s2weden2000

            yEah …

          • Martin Dimcevski

            Of course it does, LCD/IPS displays draw more power because of the led backlight witch illuminates the whole screen, no mater what content is on it (or color), whereas AMOLED screens don’t have backlight, each pixel is self illuminated, so IT DOES DRAW LESS POWER than LCD/IPS (at least most of the time)…

      • Todd

        My note 3 gets 6 to 7 hours of screen time. Not impressed. Whatever makes you feel better about your purchase, I suppose.

      • Unlocked phone master race

        >Verizon

        Sucks to be you

        • Terry Barnhill

          Are you inferring it sucks to be me because I have Verizon?

      • Adam Knotts

        Step one pop off back cover. Step two remove dead battery and replace with charged battery on my external battery charger. Step three put dead battery on charger. Step 5 laugh at people who think that a hour for a fully charged battery is quick and that think batteries have unlimited amount of charge cycles and will last forever. If u think nonremovable are a good thing your right they are a good thing. For the phone manufactures. When the capacity of your battery drops ull eventually have to buy a new phone or pay alot to replace the battery. I can get a new battery for ten dollars how bout you.

    • calmdownbro

      Step 0: Use an extended battery, or a ZeroLemon, and laugh at everyone else having crappy battery lifes. They laugh at you for having a big phone? No probs. Just throw your phone at them. ZeroLemon is the best thing since sliced bread. Period.
      (Hyperion batteries also did large packs, but dunno if they still do.)

      • Christopher Moore

        Only reason I’m not getting the zero lemon is because it won’t fit when Gear VR becomes available. And I’m afraid of the nuclear explosion when you connect one of these quick chargers to a non-oem battery; especially one that is 10,000mah. I doubt it would work at all.

        • calmdownbro

          Phones regulate the current/drawn electricity. So if you buy an extended ZL battery for your Note 4, it will charge just fine with your original charger – which supports quick charging too.

          And you can always just remove the ZL battery and put in the original one if you use the VR thing. Which you will do like once each 3 years.

          (Don’t even start that VR is now a thing. It’s not. It was a gimmick 10 years ago. And it’s a gimmick today. Even the latest Occulus causes sea sickness, and the resolution is so low the dots burn into people’s retina. Even if they fix these, it will still be a gimmick.

          Don’t take this part of my comment personal, it’s aimed at VR advertising people, not you.)

          By the way yeah, ZL cases are not the best. They DO offer A+++ fall protection, but the water and other protection is gone I guess. I do use my phone in industrial environment, but never had an issue with this.
          And hell, battery life is AWESOME. Like REALLY F. AWESOME.
          (I charge my phone around 4-6-8 days. And I do use it a lot. It’s a G Pro 2 btw.)

        • Abbas Mustafa Bhaiji

          why would you need to charge quickly when u have 10,000 mah if you have low battery on a 10,000 mah that is just being irresponisble

      • disqus_FYINAKV4CU

        When I don’t need my zerolemon and I switch back to stock, I feel like I can fly!

    • Bob’s Bilderbergers

      Oh the joys of removable batteries!

    • Faux-News

      Step 8, buy 3 Mi4 phones with that Note 4+ extra battery money.
      Step 9: Throw away the Note 4, and use 3 mi4s

      • Anonymousfella

        Mi4 to replace the Note 4? Not a good idea

    • Preben Nielsen

      Step 1: Power off Note 4 (10 secs)
      Step 2: Remove rear cover (10 secs)
      Step 3: Pop out dead battery (5 secs)
      Step 4: Realize that you cannot find or forgot to charge your backup battery (10 minutes)
      Step 5: Cry … long and hard
      Step 6: Pop in old battery
      Step 7: Replace rear cover (10 secs)
      Step 8: Power on Note 4 (20 secs)
      Step 9: Attach to charger (10 sec)

      Personally I would always prefer using an external battery-bank over replacable battery :)

    • kartoonz

      Step 1: Unplug Htc m8 in the morning
      Step 2: Use all day including seven hours of screen on time
      Step 3: Plug phone in when I go to bed with 15% battery left
      Step 4: Laugh myself to sleep thinking about people who have to charge and carry spare batteries

    • toto

      change battery ? lollol like 10year ago

      • disqus_FYINAKV4CU

        Takes 10 seconds to go from 0-100% with removable battery. How long does it take tou to go from 0-100 with plugging in?

    • Kai-Uwe Mar

      So you must have a self charging battery.

      Step 1: Laugh at people buying several batteries for a piece of tech with an average effective life cycle of 1 to 2 years :D

      • Jacob

        People that are not rich should keep using their phones for 30+ months.

        • DT

          It honestly depends on the network. As long as Verizon is “subsidizing” phones whether or not you get a new one every two years it’s not worth it to keep on an old, insecure (because they will stop providing updates when they release the new flagship) device around.

          • Jacob

            One of my mates got an iPhone in 2012 and is still using it.

            Updates are still being provided.

            He went from $40/month to $35/month or less because after 24 months the handset is no longer being cross-subsidised.

          • DT

            That’s definitely not on Verizon.

  • Sheng Zhe

    At this moment , every company is using a maximum of 2A current while OPPO decided to jump to 4.5A instead…

    • calmdownbro

      Law of physics must be honored though. So a smaller battery (like below 2500mAH) cannot be charged with 2+ A. At least, that’s my guess why Qualcomm aimed for 2A.

      Nevermind: http://www.oppoforums.com/threads/fast-when-it-counts-vooc-rapid-charge.17188/

      That’s actually pretty clever.
      If only OPPO used stock Androids. Even the One+ comes with it’s own branch of CM which can be killed anytime later on. If it had mainstream CM support (official), there would be no issues.

      • max

        you can always flash “normal cm 11” if you so desire

  • Mohan

    does quick charge 2.0 work for nexus 4 ??

    • Randy Gindy

      No it’s only available in the 800 series.

      • sluflyer06

        Snapdragon 200, 400, 410, 615, 800, 801, 805

  • sluflyer06

    The article says 36w maxmimum but then it says 3amps maximum 36w=7.2amps. So which is it?

    • geek

      that’s 3A at 12V supply so 36W max.

      • sluflyer06

        where are these magical 12V chargers.

        • Abbas Mustafa Bhaiji

          the quick chargers that will come with htc charge 2.0 will have more than 5v there are no specifics on htc and motorola chargers has what voltage, but will be soon known.

          • fioren

            But the voltage doesn’t matter. It’s the amperage what matters! Because amperage charges the battery, not the voltage.

          • Seb

            Nope, both the voltage and amperage matter!! What is important is the power delivered which depends on both voltage and current

      • AStarbucks

        Wrong! The voltage stays at 5V.

        Its only the amperage that is different. The charging circuit of your phone also has an internal limit on the input current anyway, so putting a 5V charger with a zillion Amps is pointless.

        Putting a 12V charger on something like a phone rated for only 5V input current only might well just fry it! That’s more than double the specs!

        • Martin Dimcevski

          From the text above: “Class A devices will also work with 5, 9, or 12 volt supplies and can therefore tolerate more power. The range of higher voltages means that a single charger can work with a wide range of devices and also ensures high quality performance by reducing the impact of any voltage losses that appear over long cable distances or poor quality cables.”

        • Seb

          This used to be the case!! BUT phones compatible with quick charge changed that!

  • The faster these batteries are charged the less cycles it will be able to hold the charge.

    This might kill your battery twice as fast or even faster.

    • Justice League

      ni disrespect, how do you know that? i’m not being sarcastic.

      • That how it works with batteries, the faster they are charged the hotter they get resulting in fewer cycles. A battery loses about half of it cycles when fast charged campare to ordinary charge. (really good batteries loses less bad ones more)

        So if it could hold charge for 1000 cycles before you might end up with about 500 cycles which is less than one charge every day for two years. (the battery might only hold 500 from the beginning resulting in 250 cycles. total cycles is something not specified on the box)

        Since we have no idea about the batteries used or how they handle beeing charged faster (they are made to perform with the charge specified that comes in the box) it is safer to assume that it will come with a hefty cost in cycles the battery can hold the charge.

    • Guest

      And this is a kind of planned obsolescence like non-removable battery.

  • Android Developer

    Does quick charging also damage the battery life?
    I remember some said that it’s possible to charge faster and faster, but it also affects that battery life.
    If that’s true, how did they manage to overcome this?

  • Drago

    Has anyone tested this on the Nexus 5? It has a Snapdragon 800.

    I was under the impression that it required some kind of special regulator chip, though. I’d love to know if it works with a 3 amp charger.

  • Evangelos Mpagiatis

    Does samsung galaxy S4 i9506 supports it?

  • Abbas Mustafa Bhaiji

    I am hoping i can keep my z2 till a phone with usb 3.1 comes

  • John

    Does the HTC Quick Charge 2.0 works with the Nexus 9? Does the Nexus 9 has the capability to be charged twice as fast?

    • Justice League

      i’m trying to find that out also. please post if you get an answer & vice versa. if these chargers are swapable htc vs moto, i will get one and try it out.

      • Jon

        Nexus 9 runs off of a Tegra processor not Qualcomm

  • Justin DiOrio

    My MotoG(1stGEN.) is amazing. I’ve never had my phone battery die. And I’ve had the phone 6 months. I actually had to try and kill it about a month ago because Motorola sure said its good ever month or so 2 completely drain battery and then completely recharge. Took 2 hours to kill it and it was at 15% when I started. If all phones have battery like this I think it all b good. And I’m a pretty average user. Wouldn’t say heavy, but def use my phone throughout my whole day.

  • s2weden2000

    + it decreases your battery lifetime…

  • Great post and explanation Bob Triggs!

    The Power Partners Quick Charge 2.0 charger will be available for retail sale soon. The Power Partners Quick Charge 2.0 charger is one of the only 30 watt QC2.0 class A & B compliant chargers available at this time. Class B versions can output up to 20V in compatible devices. For more information please see http://www.powerpartners-inc.com/datasheets/PEAW30-12-USB.pdf . Pre-order today!

  • kam hagh

    is it safe ? does it reduce batteries life? i mean not how long it lasts on a charge but the life ! that the battery will stop working!

  • Da Fuq

    Quick Charge? More like quick battery killer ;)

    • Jacob

      I was wondering that. Will this reduce the cycle life of the battery.

    • DT

      Except no. The Turbo has quickCharge (MAXX is what I have) and its battery is still going strong.

  • JefeBear32

    At some point you need to charge your spare battery and your replaced battery. You will still be charging twice just at different times. It comes out to about the same as the guy with only one battery.

    • Yar Nunya

      Things such as external battery chargers do exist…

      • JefeBear32

        Did not know that, sorry. Looked it up after your comment and found a galaxy s4 external battery charger for roughly 40 bucks. I always have non replaceable battery type phones so I guess I’m just used to lugging an external battery pack. I use a 12000 mah one

  • Harrison Pace

    There must be some sort of handshake that takes place given a charger can supply 3 different voltages, is this implying that I could hook a variable power supply with a 5V output and 3A current limit and it would charge faster? What about 12V at 3A – I mean there is a lot of ambiguity here in regards to actual charging mechanism? Is the charger simply a dumb charger with no IC that supplies more Current than usual or is there a handshake going on to allow the charger to change voltage?

  • TK

    “Motorola’s Turbo Charger and HTC Rapid Charger are essentially both just offering up 3 amps out of the wall at 5 volts, and will work with any Qualcomm smartphone with Quick Charge 2.0 technology.”

    I think you are mistaken, at least in the case of the Turbo. Pictures and reports spec it out as 5v – 1,6amp, 9v – 1.6amp, and 12v 1.2amp. The max 15 amps you reference is for non-Q2 enabled devices. FYI, the Tenergy Q2 wall charger puts out 5V 2A / 9V 2A / 12V 1.5A. So, the Tenergy cranks out 18 watts, while the turbo puts out a max of 14.4 watts, and only puts out 8 watts for the typical 5v phone. Not sure what that literature is all about with the 15 watt claim…

    This is a review with some close-up shots of the Turbo;

    http://www.androidcentral.com/motorola-turbo-charger

  • AStarbucks

    Y’all totally missing the point! Normally with normal chargers (low current = low heat = lower wear & tear on Li-ion battery), at the 1 to 1.5 year mark after buying phone:

    Step 1: Phone dead (fixed non-removeable battery dead cos used up all 300-400 charge cycles).

    With high current = high heat = high wear/tear:

    Step 1: Phone dead right after warranty period.

    Only buy phones with removeable batteries! LOL!

    • fioren

      You’re totally right!

      I hate ALL devices with non-removable battery.

  • Fakhre Alam

    does it mean each of those SoCs mentioned in the table have quick charging irrespective of make/model of the phone?

  • Fakhre Alam

    so if i have a phone with any of the the SOCs mentioned above in the table it will support Quick charge, irrespective of mobile brand, right? any tech geek answer please,

  • Bob Sciamanda

    You must apply a higher voltage to get a higher current. Does the battery chemical health like this increased reverse current forced through its gut?

  • Norman Culp

    Charging a battery with a current in excess of its rating will shorten battery life. See the link below for a good explanation.
    http://batteryuniversity.com/learn/article/what_everyone_should_know_about_battery_chargersConstabtThere There is a method that will charge a batter faster than the usual CC/CV method (Constant Current / Constant voltage) This method has just been patented (U S Patent 8,963,485).

  • José Tony Stark Peña

    Did he say 60 Watts? That’s 12 Amps!!!

  • Danny Cobb

    Read the site, watched the video. Trust me when I say that these people know nothing about the relationship between voltage & current and how a battery charges.

  • Nebojsa Zdravkovic

    There is no 3A output afaik, since most of the USB cables cannot withstand this current without being too thick. The highest power is delivered with 12V and 1.2A. This is what is written on Motorola Nexus 6 quick charger.

  • spacemn_spiff

    No explanation about how this affects the battery itself in terms of thermal cycling. Has battery chemistry kept up with higher charging currents, I always understood that battery chemistry was the underlying weak link and not the current you can get to the battery.

  • Rams

    Quick question, here battery also has to support. Isn’t it?

  • akash

    what is the difference between a normal 2amp adapter and a qualcomm quick charge2.0 adapter?

  • SilentShadow

    will this work on moto G gen1 ?
    as it has Qualcomm MSM8226 Snapdragon 400 ?