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An all-in-one answer to the various "Which charger do I use" threads floating around.
Disclaimer: This is not exhaustive. I bear no responsibility for any incorrect purchases, damage to property, and other losses sustained.
Question: "I have an iPad charger. Will this charge the Nexus 7?"
Answer: No. Apple uses proprietary signalling in the iPad charger. As a result, they will not charge our Android devices at any rate above 500mA. Also avoid third-party chargers that are "Made for iPad/iPod/iPhone" and the like - they will probably not charge at the full 10W, although high-end universal products will usually be compatible with both iPad and the Nexus 7.
Question: "I have a BlackBerry Playbook/Samsung Galaxy Tab/HP Touchpad charger. Will it charge the Nexus 7?"
Answer: Likely yes. Any 2A charger should do the job, as long as it isn't designed solely for iDevices.
Question: "I want to use the charger that came with my smartphone, is it safe to charge my Nexus 7 with that?"
Answer: Yes. Charging a high-current device with a lower-powered charger will not cause a dangerously high current to be drawn - a 1.2A charger will simply cap out at 1.2A when charging the Nexus 7.
Question: "I want to charge my both my phone and my Nexus 7 from a 2A charger, is it safe to do that?"
Answer: Yes. A charger does not "push" current into a device - the device requests a certain current, and the charger delivers it. The minuscule current requirement of a Bluetooth handsfree earpiece can be safely supplied by the 2A Nexus 7 charger.
Question: "What's the difference between the official charge cable and a third party cable?"
Answer: Very little, as long as the third-party cable is of decent quality. Other cables may or may not physically fit depending on physical dimensions due to the Nexus 7's curved edge, but all microUSB to USB cables should be electrically identical.
Question: "Do you have a list of chargers that will charge the Nexus 7?"
Answer: What you are after is a charger that has an output of approximately 2A or above, although a lower powered charger should charge the Nexus 7 (but take longer).
Chargers that will "Fast Charge" - i.e output ~10W (not exhaustive)
Official Charger
HP Touchpad charger
ASUS Transformer TF101 Charger (AD827M)
Kindle Fire Charger
Blackberry Playbook Charger
Most Sleep and Charge USB 3.0 ports on laptops and PCs (may vary by output)
High-end portable universal USB chargers with a 5V 2A output such as Trent iCarrier, Anker Astro series, Incredicharge I-11000, etc.
Please make this sticky... in the Accessories Foirum
MODS: Please consider making this a sticky in the Nexus 7 Accessories Forum. Much of the talk in this, this and other threads is answered by the OP. It's very well written and addresses much of the confusion on the issue.
Or at least consider some effort to merge these threads.
Thanks!
No offense to the OP of this thread, but there's no information about getting the tablet charging at the same rate on a third party 2A charger versus the stock charger. There's a difference between having a charger "work" and having a charger work like the stock charger. I have another thread going regarding charging and you might find these two posts helpful.
http://forum.xda-developers.com/showpost.php?p=29049082&postcount=7
http://forum.xda-developers.com/showpost.php?p=29641898&postcount=40
This answer from the OP looks suspiciously like what I wrote in my first post.
Answer: Yes. A charger does not "push" current into a device - the device requests a certain current, and the charger delivers it.
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Click to collapse
Might just be a coincidence though.
AZImmortal said:
No offense to the OP of this thread, but there's no information about getting the tablet charging at the same rate on a third party 2A charger versus the stock charger.
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Click to collapse
I think you may have just helped add some (answered) questions to the FAQ
Here is a question I think might be useful to include:
"How can I know at what my rate N7 is being charged?"
(The answer would include the techniques and/or apps that would help one know whether their charger is operating at maximum, or if not, how much less)
I'm also curious to know whether an adaptor such as this one could be used to convert an iPad charger to work with an N7
Yes, there are many threads on the issue scattered around, and I'm more interested in having them most usable than being concerned about who wrote what first. A FAQ format would work best as a sticky, and could be populated by much of the existing information AZimmortal and others have provided. Another thread has a decent listing of "what chargers work" that goes beond the OP here, and could easily be merged in
Best case scenario is for the OP to incorporate material from other threads -- giving credit where approrpriate -- keeping to the FAQ format.
That adapter you linked is more or less like the one I have. I used to own a Galaxy Tab and sold it the day after I got my Nexus 7. In hindsight, I should've tested the charger to see if it would charge at the same rate. If you end up buying such an adapter and can test out charging with another 2A charger, then I'd love to see the results. Unfortunately, I don't have another 2A charger to test with.
It would be nice to have an app that gives us a clue about what's going on when we plug into a charger.
Maybe it could display the request the Nexus 7 made for power, what the response was, how much power is being sent, expected recharge completion time, etc.
Does such an app exist? Would it be difficult to create one?
Has anybody used the PortaPow Quad 4 Port USB charger with the Nexus 7 yet, and if so what were the results?
I've bought a couple of supposedly 2A multi USB chargers and they don't seem to want to play with my Nexus. Don't particularly want to buy every one on the market to test them out. The PortaPow one looks like it will work, but then so did the others.
Anybody know what is really implemented?
Does anyone know what portions of the USB2.0 Battery charging Specification protocols the nexus 7 uses. Is it just shorted DP/DM (DCP = Dedicated Charging Port)) or else it assumes SDP (standard data port)? Or does it look for CDP (Charging Data Port)? Does it reduce its charge current if the input voltage sags (like it might do with a 1A DCP). Does it look for ACA voltages?
Does the nexus charger just short DM/DP?
I have a Nexus 7 factory-included charger and I was wondering if I could safely charge my Nexus 4 with it. Reading from the specs printed on the chargers, the N7 charger outputs 2.0A at 5.0V, while the N4 charger outputs 1.2A at 5.0V. If it's safe, would it affect the N4's battery longevity in the long term? Considering it would be charged with a higher current.
Yes the battery life will reduce more quickly if you use more current to frequently charge it.
Sent from my Nexus 4
It won't be charged with a higher current. The charging circuit will only draw what it needs regardless of what the supply can output.
Yes, you can. The charge controller is in the phone. This is perfectly acceptable and will not harm your device in the long run.
I've been using my Nexus 10 charger to charge my Nexus 4, which has the same output as the charger you just described.
Higher amperage will generate more heat, which in turn can damage circuitry and the battery. At the end of the day, it's your call.
Sent from my Nexus 4
I don't suggest you charge it with the nexus 7 charger all the time use it only when you really need to get a quick charge.
harmohn said:
Higher amperage will generate more heat, which in turn can damage circuitry and the battery. At the end of the day, it's your call.
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Click to collapse
Yes, higher amperage will generate more heat, but the battery management system (BMS) is sized for the battery. The BMS will not allow more current into the battery than it can handle. This is independent of how much current the power supply can provide.
<http://en.wikipedia.org/wiki/Battery_management_system>
Not really sure which side to believe
Shimakaze said:
Not really sure which side to believe
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Click to collapse
Haha me neither
I was told it's fine just like it's fine to charge an iPhone with an iPad charger. I've been doing it with my Nexus 4 but who knows.
no dont do this otherwise it damages your battery life
Using the Nexus 7 charger (or any other higher amperage charger) WILL NOT
Damage your phone
Damage your battery
Cause your phone to draw unsafe amount of amperage
Cause your phone to get hotter than normal
Make your battery charge faster
This is 2012, not 1831. We have industry standards and the microUSB standard was designed with the idea in mind that users may have both chargers with varying amperage outputs and devices with varying amperage inputs. People much smarter than us designed the standard to be compatible, a novel idea right?
Please do not spread FUD and misinformation, especially without bringing any evidence to the table. You are not doing people who come across this thread a service (like the OP) by creating the illusion that there are two sides to this discussion.
quentin0 said:
Using the Nexus 7 charger (or any other higher amperage charger) WILL NOT
Damage your phone
Damage your battery
Cause your phone to draw unsafe amount of amperage
Cause your phone to get hotter than normal
Make your battery charge faster
This is 2012, not 1831. We have industry standards and the microUSB standard was designed with the idea in mind that users may have both chargers with varying amperage outputs and devices with varying amperage inputs. People much smarter than us designed the standard to be compatible, a novel idea right?
Please do not spread FUD and misinformation, especially without bringing any evidence to the table. You are not doing people who come across this thread a service (like the OP) by creating the illusion that there are two sides to this discussion.
Click to expand...
Click to collapse
This sounds like the most sensible post in this thread. :good:
3bs11 said:
I was told it's fine just like it's fine to charge an iPhone with an iPad charger. I've been doing it with my Nexus 4 but who knows.
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Click to collapse
ptt1404 said:
no dont do this otherwise it damages your battery life
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Click to collapse
It does work fine like the iPhone/iPad charger dilemma. The BMS protects the battery from any damage, so there is no need to worry about abnormal decrease in battery life.
Sorry for the delay:
To prevent spam to the forums, new users must wait five minutes between posts. All new user accounts will be verified by moderators before this restriction is removed.
Click to expand...
Click to collapse
quentin0 said:
Using the Nexus 7 charger (or any other higher amperage charger) WILL NOT
Damage your phone
Damage your battery
Cause your phone to draw unsafe amount of amperage
Cause your phone to get hotter than normal
Make your battery charge faster
This is 2012, not 1831. We have industry standards and the microUSB standard was designed with the idea in mind that users may have both chargers with varying amperage outputs and devices with varying amperage inputs. People much smarter than us designed the standard to be compatible, a novel idea right?
Please do not spread FUD and misinformation, especially without bringing any evidence to the table. You are not doing people who come across this thread a service (like the OP) by creating the illusion that there are two sides to this discussion.
Click to expand...
Click to collapse
Complains about people not bringing any evidence to the table...
Brings no evidence to the table.
Sent from my Nexus 4 using Tapatalk 2
droidmakespwn said:
Complains about people not bringing any evidence to the table...
Brings no evidence to the table.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
http://yourlogicalfallacyis.com/burden-of-proof
quentin0 said:
http://yourlogicalfallacyis.com/burden-of-proof
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Click to collapse
Where is your proof discrediting the others that said it is damaging. Check this link.
http://yourlogicalfallacyis.com/burden-of-proof
Sent from my Nexus 4 using Tapatalk 2
I wish I could find my post I did about this in another thread.
Yes it is perfectly safe, if not safer, to use a higher amp charger.
It is not safer to use a higher VOLTAGE charger.
Why? Ohms law.
The phone has 2 resistance settings triggered by the data lines of the port. If they are open (computer USB port) it sets itself to 10 ohms. Thus drawing 0.5A (500mA) @ 5V.
If the data lines are closed (wall or car charger) the phone sets itself to 5 ohms. Thus drawing 1A @ 5V.
Amperage is determined by the resistance of the phone.
The rating of the chargers are the MAX amps you can draw from them before they melt down or break. NOT what they push out to your phone. Amps are pulled/drawn out. Voltage is pushed out.
Don't believe me? Get a 5 Ohm resistor. Attach it in series with a multimeter on amps to the outputs of each charger. Then check the Amps of both chargers. It will be nearly equal (about 1A). NOT 1.2A and 2A!
I should make a video demonstration about this, because I see this question a lot!
Sent from my Nexus 4 using Tapatalk 2
Shimakaze said:
Not really sure which side to believe
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Click to collapse
Sorry, but there are a number of folks here who do not understand basic electricity, yet feel qualified to post advice about it.
A typical electrical outlet in your home is capable of delivering 15 to 20 amps. If you plug a device into one that can only handle one amp, does it explode or is it damaged in any way?
Electrical circuits present a "load" to the supply they are connected to. This load determines how much current it will draw.
This is middle school electric shop folks.
Umm, Not really sure if this helps..
But I've been charging my N4 from my N7 charger since I got it. The N4 charger/cable are still in the box.
I have not seen any side effects as of yet, but no clue if there could be months from now...
Would this be the same "questioning" between charging the phone from the provided outlet adapter vs a computer USB port?
UberSlackr said:
Would this be the same "questioning" between charging the phone from the provided outlet adapter vs a computer USB port?
Click to expand...
Click to collapse
A USB port is only capable of supplying 500mA, and that is what the n4 will charge at when plugged into one. This is actually handled by the phone as it knows it is a computer based on terminations on pins 2 and 3 (data signal). Power is delivered via pins 1 and 4.
I'm just wondering if using a different charger would affect the Z1's battery life?
I've seen the description on the original charger, and it's charge rate is 1.5mAh and with the phone's 3mAh battery almost 2 hours for it to charge. Now, my sister and dad have tablets and their chargers' charge rates are 2mAh.
Again the question is, would using these charges affect the life of the Z1's battery? Again, I'm very concerned because as you know, Z1's cannot be replaced conventionally.
Thanks for your feedbacks. Appreciate it.
Sent from my C6903 using xda app-developers app
I actually just bought the 2 Amp Samsung charger for that exact reason...takes too long to charge. I don't think there would be any issue.
Sent from my C6916 using Tapatalk 4
mrcrusha829 said:
I actually just bought the 2 Amp Samsung charger for that exact reason...takes too long to charge. I don't think there would be any issue.
Sent from my C6916 using Tapatalk 4
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Click to collapse
Thanks for the quick reply dude, but any technical references or long-term observations that would prove this is okay?
Sent from my C6903 using xda app-developers app
FYI
Hi guys! You're totaly wrong. If you are use high-ampers chargers for your phones, you can destroy your battery or, at least, significantly reduce the battery life. I have some bad experience with motorola radio stations wich we use in some airport service groups. When we buy hi-ampers chargers for it we was happy by time of chargeing, but after half of year useing it we just throw out all accums, because it began to hold charge about hour or two only
After consulting with with motorolla support we have found that its strongly not reccomended to use charger with higher amperage then recomended by manufacturer.
As a result:
Positive - we have quick charging time
Negative - disastrous decline in the lifetime of the battery
romaha said:
Hi guys! You're totaly wrong. If you are use high-ampers chargers for your phones, you can destroy your battery or, at least, significantly reduce the battery life. I have some bad experience with motorola radio stations wich we use in some airport service groups. When we buy hi-ampers chargers for it we was happy by time of chargeing, but after half of year useing it we just throw out all accums, because it began to hold charge about hour or two only
After consulting with with motorolla support we have found that its strongly not reccomended to use charger with higher amperage then recomended by manufacturer.
As a result:
Positive - we have quick charging time
Negative - disastrous decline in the lifetime of the battery
Click to expand...
Click to collapse
tat is motorola. this is sony.
i also brought a samsung 2amp charger to charge my previous xperia v n current phone.
sony phone itself hav a circuit to regulate the input if it found charging amp way too high.
romaha said:
Hi guys! You're totaly wrong. If you are use high-ampers chargers for your phones, you can destroy your battery or, at least, significantly reduce the battery life. I have some bad experience with motorola radio stations wich we use in some airport service groups. When we buy hi-ampers chargers for it we was happy by time of chargeing, but after half of year useing it we just throw out all accums, because it began to hold charge about hour or two only
After consulting with with motorolla support we have found that its strongly not reccomended to use charger with higher amperage then recomended by manufacturer.
As a result:
Positive - we have quick charging time
Negative - disastrous decline in the lifetime of the battery
Click to expand...
Click to collapse
That's very unfortunate to hear dude, thanks for your input. I hope to not make the same mistakes again.
Sent from my C6903 using xda app-developers app
chunlianghere said:
tat is motorola. this is sony.
i also brought a samsung 2amp charger to charge my previous xperia v n current phone.
sony phone itself hav a circuit to regulate the input if it found charging amp way too high.
Click to expand...
Click to collapse
Thank you for your insight.
I have several questions though:
1) how long have you been using this 2amp charger? Was it continuous usage?
2) do you have any idea, or any exact figure on what "too high" means in numbers? That way we can all benefit if Sony phones could handle the extra "uhmp". And anyone who has a Z1 who can attest to this?
Sent from my C6903 using xda app-developers app
2amp isn't problem.
I'm using that charger (from my N7) and only thing I changed is cable - I'm using magnetic-microusb cable and that's great combo.
I'm charging Z1 from the day 1 (I bought Z1 in October 2013) and my battery is still perfect.
25-30hours with.5.5-6.5 h of screen time.
Sent from my C6903 using Tapatalk
The rated output of a charger is the maximum output, however it will only output what the phone takes in - in other words, if the phone only takes 1.5A, the charger will only output 1.5A even if it's capable of 2.1A. Using a higher ampere charger would only work if, say, the phone can take in 1.5A but the charger only outputs 1A, then using a 1.5A charger would boost charging times
funky0308 said:
2amp isn't problem.
I'm using that charger (from my N7) and only thing I changed is cable - I'm using magnetic-microusb cable and that's great combo.
I'm charging Z1 from the day 1 (I bought Z1 in October 2013) and my battery is still perfect.
25-30hours with.5.5-6.5 h of screen time.
Sent from my C6903 using Tapatalk
Click to expand...
Click to collapse
Hmmm, that looks promising, I also ordered a magnetic micro usb cable few weeks back. Thanks for your feedback dude.
Sent from my C6903 using xda app-developers app
pandaball said:
The rated output of a charger is the maximum output, however it will only output what the phone takes in - in other words, if the phone only takes 1.5A, the charger will only output 1.5A even if it's capable of 2.1A. Using a higher ampere charger would only work if, say, the phone can take in 1.5A but the charger only outputs 1A, then using a 1.5A charger would boost charging times
Click to expand...
Click to collapse
Yeah, that's what I also believe. But hey, then why do most gadgets heat up a little bit more when using a stronger charger? I'm not doubting the principles that you mentioned, but I need something tangible to look at: like an article from Sony for Z1 itself.
The other guy's experience and your comment here seems to be coinciding with each other, but You can never be too sure right?
But seriously, Thank you for your insight. I really appreciate it. That's what I like about the community here. Thanks man!
Sent from my C6903 using xda app-developers app
digiknowzone said:
Yeah, that's what I also believe. But hey, then why do most gadgets heat up a little bit more when using a stronger charger? I'm not doubting the principles that you mentioned, but I need something tangible to look at: like an article from Sony for Z1 itself.
The other guy's experience and your comment here seems to be coinciding with each other, but You can never be too sure right?
But seriously, Thank you for your insight. I really appreciate it. That's what I like about the community here. Thanks man!
Sent from my C6903 using xda app-developers app
Click to expand...
Click to collapse
Gadgets heat up more when using a stronger charger because of my second premise - that the phone is capable of taking in a higher amperage than the charger that it came with. I think such a scenario is more likely since manufacturers would find a balance between charging times and heat, since too much heat would permanently damage the phone's charging circuitry as well as shortening battery life, so they provide a charger that outputs a lower maximum than what the phone can take in.
I do not know of any documentation Sony might have on this, but this is more or less physics in action. I did find a couple of readings here and here, and the main snippets are as follows:
PopularMechanics said:
But the amperage rating is only a measure of the adapter's maximum capability—the actual amperage is determined by the load (i.e., the iPad or iPhone)
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Click to collapse
HowToGeek said:
If you connected the tablet’s charger to the smartphone, nothing would explode or catch fire. The smartphone likely won’t draw the maximum number of amps the charger can provide, but that should be fine. The smartphone may even charge a bit faster.
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Click to collapse
Hi note 3 using a stock charger and 2m USB 2.0 lead will not charge the phone if its running a game it will still deplete. If the phone is turned off it will charge fine.
blair287 said:
Hi note 3 using a stock charger and 2m USB 2.0 lead will not charge the phone if its running a game it will still deplete. If the phone is turned off it will charge fine.
Click to expand...
Click to collapse
Well, I think you having INDEX problem... Did you put PDF files recently in your phone? If you have PDF files in your phone delete all of them, and reboot your phone...
I have the same problem...
What is about PDA files with charge problem?
Sent from my SM-N9005 using xda app-developers app
blair287 said:
Hi note 3 using a stock charger and 2m USB 2.0 lead will not charge the phone if its running a game it will still deplete. If the phone is turned off it will charge fine.
Click to expand...
Click to collapse
With the risk of looking too harsh I have to repeat, XDA is not somebody's paid support center - around here people are expected to AT LEAST:
- read the rules; ONLY POST QUESTIONS IN THE Q/A FORUM!
- search first for more details
- provide relevant details for the question asked.
In this instance you should have at least tested if the problem persists with the original cable (and/or any other high-quality USB cables that are "known good" eventually from other phones).
xclub_101 said:
With the risk of looking too harsh I have to repeat, XDA is not somebody's paid support center - around here people are expected to AT LEAST:
- read the rules; ONLY POST QUESTIONS IN THE Q/A FORUM!
- search first for more details
- provide relevant details for the question asked.
In this instance you should have at least tested if the problem persists with the original cable (and/or any other high-quality USB cables that are "known good" eventually from other phones).
Click to expand...
Click to collapse
someone is on his high horse
I have had the phone for a few days now. I have tried 3 different charging bricks as well as a new Samsung charging cable. No matter what I do, I only get "charing USB" and using the ampere app, it never hits about 4volts on charging and says "normal" as charging state. I'm using a galaxy s6 fast charger and tried 2 cables and 3 bricks and still just "normal" mode. Any help pls?
nellycruzz said:
I have had the phone for a few days now. I have tried 3 different charging bricks as well as a new Samsung charging cable. No matter what I do, I only get "charing USB" and using the ampere app, it never hits about 4volts on charging and says "normal" as charging state. I'm using a galaxy s6 fast charger and tried 2 cables and 3 bricks and still just "normal" mode. Any help pls?
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Click to collapse
Can you please confine your charging related questions to a single thread? I would like to answer then but keep finding new threads???
Sent from my SM-T810 using Tapatalk
Well I'm sorry. I wanted to make it more precise. I'm sorry
Thread Closed. Please only create one thread on this matter.
The thread with the most support created about this can be found here: Using Samsung Fast Charger To Charge Phone?