I've been reading already too many times the same story about battery charging noise, and inability to charge. My findings:
1. some charges make a high pitched noise. This is normal. It is not your phone that is broke, it's the converter inside the charger (which is not broke either). Manufacturers unfortunately try to save money and use cheaper and cheaper components. Some chargers make a sound, some don't Try using another microUSB charger, or use a standard USB adapter plug and a microUSB cable. Tonight I've tested HTC and Nokia, and found out that those Fins make excellent chargers
2. The standard Samsung charger has 2.0A output at 5.0V (that is a whopping 10W for the mathematicians among you, (also for others actually)). Note that ampere output is just a specification from the manufacturer, it is not absolute. My HTC charger gives 1.0A and my Nokia charger 1.2A. Tonight I discovered that you need at least 1200mA to charge when the phone is on. However, I've successfully charged the phone while switched off with the 1000mA charger. I haven't tried with less amperes yet.
3. While the phone is on and the 1000mA charger plugged in, the phone sound an alarm every second and a blinking "charging xx%" is shown on the screen. It drove me nuts at first until I switched to the aforementioned 1200mA charger, which stopped the sound and continued charging normally. Note that my phone did not start with complaining until it reached 19% with my phone, but I've seen posts by other users who experienced the same behaviour at other precentages.
hope this helps
Related
Anyone else have any experiences they'd like to share using non-OEM chargers?
I use my HP TouchPad charger in my living room, as my HP Touchstone plugs into it usually. It charges the N7 at exactly the same rate as the OEM charger.
Just curious about others' experiences.
Oh....and is anyone else w/the HP TouchPad just completely spoiled regarding tablet prices? $250 seemed like a lot of money to pay, LOL.
http://saraoutlet.com/yxt-023-us-2-...for-apple-ipad-iphone-4g-3gs-white-35561.html
I use this, it charges my iphone, ipad, ipod touch, samsung, and now my nexus. I have one for the car as well that is 1A/2.1A.
the blackberry playbook 1.8a charger works really well. indistinguishable from the supplied OEM. available for $16 bucks or so in retail packaging.
I've used the same charger for my Galaxy SII. Seemed to do the job well and just as quickly!
I have a few blackberry chargers one is a playbook one and some other android chargers.. they all work just fine.
I'd love to know if there are any portable chargers that will charge the Nexus 7 without being plugged into the wall, so, I can charge it when I'm laying in bed or something, I have portable USB chargers that I don't thing would work with the 7 The Duracell Powerhouse USB charger and the Sony Media CP-ELS USB Portable Charger with 2,000 mAh Li-Ion Battery, I use them interchangeably with my iPhone 4S and Playstation Vita.
Okay, I went through my "wall wart" drawer and tried 8 chargers and 9 cables. I can't find any pattern to the results
There was one cable (skinny black generic USB) that didn't work with charger, and one charger (from a Kingston Wi-Drive) that wouldn't work with any cable.
The best cable was a white mini-usb (that I used with a mini-micro dongle) that had come with my generic 5000 mAH backup battery; it worked with *everything* except the Wi-Drive charger. The best chargers were the OEM ASUS charger, and a generic small black cube (1A) labelled "KIN"; those worked with every cable except the skinny black dud.
The worst of the working chargers were an "Innergie" dual laptop/USB power supply, and the generic battery backup. Those only worked with that white cable.
Honorable mentions go to an old Motorola RAZR charger (used with a mini-micro dongle) and a small Samsung phone charger. Those have permanent cables, and both worked.
I couldn't pick up any pattern in terms of amp rating (obviously, the lower amp chargers will take longer). It seems to be "luck of the draw".
I've tried probably 4-5 different chargers including a Motorola wall charger plugged in the wall, and also plugged into a power inverter in my truck, a motorola car charger and an oem wall charger and have no issues with any of them.
iPad 3 charger compatibility
Can anyone confirm if N7 charges using the new iPad 10W charger? Mine only supports the charger that came with it. Does that mean that the usb port is broken and I need to replace it or is it the way all the units behave?
Other XDA threads with similar topic:
http://forum.xda-developers.com/showthread.php?t=1780211
http://forum.xda-developers.com/showthread.php?t=1781680
http://forum.xda-developers.com/showthread.php?t=1784322
dmalovic said:
Can anyone confirm if N7 charges using the new iPad 10W charger? Mine only supports the charger that came with it. Does that mean that the usb port is broken and I need to replace it or is it the way all the units behave?
Click to expand...
Click to collapse
It charges using my iPad2 charger, which I think is the same charger as the new iPad?
The Nexus 7 does not show charging when plugged into any of my OEM/aftermarket Apple chargers.
It does not appear to matter whether I use the USB cable supplied by Asus, or a standard commodity micro USB cable.
There is evidence from other users that the tablet may be charging at the 1A rate even though the charge indicator stays off.
I have not personally confirmed this yet.
Im using the charger of my BlackBerry playbook! 5volts 2amp!
From 0% to 100% in less than 3 hours!
Sent from my Nexus 7
I bought 10 of the HP Touchpad chargers for $5 shipped a few weeks ago. They work perfect for the Nexus 7, same plug, 2AH charging..
I think you can still find them for $5 shipped @ hp.com
All my micro USB chargers work , from Nokia to BlackBerry to HTC all fab all charge the n7 OK
Sent from my Nexus 7 using xda premium
martyg7 said:
The Nexus 7 does not show charging when plugged into any of my OEM/aftermarket Apple chargers.
It does not appear to matter whether I use the USB cable supplied by Asus, or a standard commodity micro USB cable.
There is evidence from other users that the tablet may be charging at the 1A rate even though the charge indicator stays off.
I have not personally confirmed this yet.
Click to expand...
Click to collapse
I've had one of those OEM/aftermarket Apple charges blow up on me (not shrapnel, it stayed in the plastic casing), so I wouldn't expect much from those anyway. Have you tried with any standard micro USB phone charger?
Chargers that work:
- Motorola Droid Pro (hard-wired micro USB). Rated at 800 mA but seems to charge almost as fast as the OEM.
- Kin One (Uses any USB cable). Rated at 1A, works with every USB cable I have (almost; there were a couple that didn't work with anything). These are available on-line for less than 10 bucks:
http://www.amazon.com/Sharp-Standard-Wall-Charger-CNR1002/dp/B005IY428Y
http://www.aftermarketcellular.com/ic/CNR1002.html
This is nice and compact; I'm going to order a couple of more to have as spares.
- Motoroloa RAZR (hard-wired mini-USB, used with mini-to-micro adapter). Rated at 500 mA. Works, but probably pretty slow.
- Samsung (from unknown phone; hard-wired micro-USB) rated at 750 mA. Didn't test charge time.
As an aside, I have a 5000 mAh backup battery that I've used with phones and my Nook color (http://www.amazon.com/5000mAh-External-Motorola-Blackberry-Nintendo/dp/B004P8E612). It works with the Nexus, but ONLY with the mini-USB cable that the Power Bank shipped with. Every other cable I've tried chokes. It's intended for an iPhone and puts 6.5V across the power pins (with no load; this is about the same as the Kin) and pulls the data pins to 3.4V. What's weird is that I can connect a 2-conductor (charge only) extension in series with the working cable, so that the data signal never reaches the Nexus. If I use a 2-conductor cable by itself, the Nexus doesn't charge.
tjupille said:
Chargers that work:
Click to expand...
Click to collapse
When you say they work, are they showing as AC charging when you use them or are they just charging.
Go-to battery stats and it will say either
Charging (USB)
Or
Charging (AC)
Sent from my Nexus 7
Compatable car charger
It's really disappointing to know N7 is so picky about chargers. Can anyone report on a working small/short car USB charger that is compatible?
You might want to check that your vehicle can provide 2amps from its cigarette lighter plug. Normal only utility plugs can do that.
Sent from my Nexus 7
I tried swapping out the USB cable that came with my nexus 7 with a longer usb cable (still using the same charger though edit: by that, i mean the ASUS charger that came with the N7). It doesn't seem to be charging though, even though it says 'charging' on the screen. When i was using the nexus 7 while plugged in, i actually lost 1% charge after using it for like 30 or so minutes.
I think i grabbed this cable off Ebay. It had no trouble charging my phone. Are there different grades of USB cables or something?
By same charger do you mean the one it came with? The 2 amps charger. Sorry I had to clear that bit up. I think longer cables creates more resistence but I'm not sure if the cable length is significant enough stop charging. I have no idea about grades of USB cables though maybe someone can elaborate on that.
Summerfly said:
By same charger do you mean the one it came with? The 2 amps charger. Sorry I had to clear that bit up. I think longer cables creates more resistence but I'm not sure if the cable length is significant enough stop charging. I have no idea about grades of USB cables though maybe someone can elaborate on that.
Click to expand...
Click to collapse
Yes, the ASUS charger it came with, i plugged in the 6 foot microusb cable i bought off ebay into it.
MFister said:
Yes, the ASUS charger it came with, i plugged in the 6 foot microusb cable i bought off ebay into it.
Click to expand...
Click to collapse
Okay, 6 foot cable doesn't sound excessively long. I have to ask what were you doing on it while charging and what brightness setting was the screen at. Maybe you were draining more power than the charger can provide?
This is pretty common. The stock cable has larger conductors, as I assume other 2 amp chargers come with, and standard cables are sensed somehow and charging current is limited. Try finding a 22awg cable, I think it will work.
I use a USB extender since I don't have any outlets near my bed. I use a cable rated for USB 2.0 and haven't had any problems. I have had problems with cables that aren't. The Motorola USB cables are rated for 2.0 and they all work fine for me with no problems.
burpootus said:
This is pretty common. The stock cable has larger conductors, as I assume other 2 amp chargers come with, and standard cables are sensed somehow and charging current is limited. Try finding a 22awg cable, I think it will work.
Click to expand...
Click to collapse
Thanks, i assume this cable that's 28/24 awg would work?
http://www.monoprice.com/products/p...=10303&cs_id=1030307&p_id=8643&seq=1&format=2
I use a cable extender, but I insert the original stock cable into the tablet (not the charger). It appears to recognise that and charge at the correct rate.
I've tried using a usb extender to charge with the asus charger and the Asus USB cable and checking with battery graph it charges much slower compared to using just the Asus cable.
People with eyesight better than mine will see that the micro USB socket has 5 pins and the Nexus looks at the 5th pin to decide what is connected and what the connected device is allowed to do. The pin can be grounded, not connected (floating) or can be connected to ground via I think 3 fixed resistances. Google for USB on the go. I think that is the standard adopted by Asus and the cable doesn't comply.
I'm using a nook 1/2 cable I got with a car charger for the nooktablet
It works and is longer then the stock cable it came with.
Sent from my Nexus 7 using Tapatalk 2
EE here. I just ran into this issue recently, so I'll share what I learned. Grab a multimeter and measure the resistance of the cable. Check all 4 pins just in case one of them is worse than another.
In my case, I had a really horrible USB extension cable. It measured about 4 Ohms. 4 Ohms is low enough for a multimeter to pass a continuity test, but do out the math:
V = I * R
V = 2A * 8 Ohms (4 Ohms on VCC, 4 Ohms back on GND)
V = 16V.
16 volts?? Where does 16V come from? Short answer: It doesn't. If 2A were actually flowing, the USB cable would have a 16V drop across it. It doesn't though, which tells us that 2A is not flowing. 1A is also not flowing, since that would still be 8V.
0.5 Ohms is a good estimate for a MAXIMUM resistance for a USB charging cable. That's a 1V drop at 2A, meaning the phone is only getting ~4V. That explains why the USB cable that comes with the Nexus 7 is so darn short - it comes in at around 0.1 Ohms (or perhaps less, that's about the limit of what I can accurately measure)
Wanted to get a longer USB cable that will work the Asus adapter, any links?
Thanks.
came across this thread while investigating a strange thing in charging my 4400mah extended battery of my s3.
I have a 5v 1A stock samsung charger with an extension cable i was always using to charge my old phones with a less capacity battery (mugen 3200mah)
This night i spent i wasnt ble to get a full charge from 5% to 100% in 8 hours and this sounds more than strange, but yet understandable.
i will try timings with the stock cable without extension and i'll come back...
Hello,
There is a strange issue here. I've got Nexus 7 (the old version) and two Xiaomi Mi2 phones (one of them is Mi2s). All have latest firmware. All of them had their own AC adapters and cables. After some usage I needed to buy new cables so I've bought 5 pcs of these: https://www.fasttech.com/p/1048600 They are great cables, look strong and build quality is perfect. The only thing.. they do not charge my devices properly. If I take Nexus' charger, Nexus itself and this Samsung cable - Nexus shows charging sign, it gets hot, but charging percent just doesn't change. If I turn the screen off, then it gains about 30-40% of charge overnight. But if I use the tablet while charging, it gets very hot but charge goes down! If I just replace the cable with the native one Nexus charges in 3 hours, Xiaomi in 2.
Even more strange thing happens when I use a powerbank instead of wall charger (like this: https://www.fasttech.com/p/1340502 + 3 x https://www.fasttech.com/p/1143803). With original cables it charges as fast as the wall charger. With Samsung cable - Nexus doesn't charge (but shows charging sign), Xiaomis just go crazy, they start vibrating and flashing their charge indicators, do not charge.
Moreover, I've noticed what sometimes when Nexus is "charging" with Samsung cable its screen starts to touch itself like crazy
The question is... WTF? Aren't those Micro-USB cables all the same? Do they have anything but the wires inside???
m0n5ter said:
Hello,
There is a strange issue here. I've got Nexus 7 (the old version) and two Xiaomi Mi2 phones (one of them is Mi2s). All have latest firmware. All of them had their own AC adapters and cables. After some usage I needed to buy new cables so I've bought 5 pcs of these: https://www.fasttech.com/p/1048600 They are great cables, look strong and build quality is perfect. The only thing.. they do not charge my devices properly. If I take Nexus' charger, Nexus itself and this Samsung cable - Nexus shows charging sign, it gets hot, but charging percent just doesn't change. If I turn the screen off, then it gains about 30-40% of charge overnight. But if I use the tablet while charging, it gets very hot but charge goes down! If I just replace the cable with the native one Nexus charges in 3 hours, Xiaomi in 2.
Even more strange thing happens when I use a powerbank instead of wall charger (like this: https://www.fasttech.com/p/1340502 + 3 x https://www.fasttech.com/p/1143803). With original cables it charges as fast as the wall charger. With Samsung cable - Nexus doesn't charge (but shows charging sign), Xiaomis just go crazy, they start vibrating and flashing their charge indicators, do not charge.
Moreover, I've noticed what sometimes when Nexus is "charging" with Samsung cable its screen starts to touch itself like crazy
The question is... WTF? Aren't those Micro-USB cables all the same? Do they have anything but the wires inside???
Click to expand...
Click to collapse
There are two types of cables. Data + charge cables and charge - only cables. The data capable cables will charge more slowly than the charge - only ones. The difference is dramatic as you have seen. So, no, all those cables are not the same.
Sent from my SCH-I545 using Tapatalk 4
wtherrell said:
There are two types of cables. Data + charge cables and charge - only cables. The data capable cables will charge more slowly than the charge - only ones. The difference is dramatic as you have seen. So, no, all those cables are not the same.
Click to expand...
Click to collapse
Well.. In this terms all the cables I use are the same. All of them can handle PC-device communication AND charging. So this is definitely not the difference..
Guage of wires and length also affect it. Shorter & thicker the wires the better they will do. I got tired of the confusion & just got some charge - only cables. These are great for charging but no data through put at all.
Sent from my SCH-I545 using Tapatalk 4
Almost every charger ive ever plugged my phone into has said charging rapidly. Even my mom's cheap gas station car adapter. Is this a matter of 5v vs amps? I've always used amps to ensure the power of a charger but a 1amp adapter is telling the phone it is charging rapidly..
Hi, i ordered a few car chargers, all were said 'fast charge'/quallcom fast charge 2/3 etc on ebay/aliexpress.
With all of them phone says 'slow charging'.
Can somebody recommend a fast car charger, that's not expensive(less than 15$)?
Thanks
Anker do one its just over £15 here not sure in US
Anker PowerDrive Speed 2 39W
https://www.amazon.co.uk/Anker-Powe...pID=418OOluwVML&preST=_SY300_QL70_&dpSrc=srch
Did you try it with the original or high quality cable? Besides do not buy cheap chargers especially fast ones.
You could damage the battery. I would recommend Samsung's original fast adaptive charger. The older models work well too (you could save some money by buying the older s7 variant). They will ship to you with micro USB, but you could bring your own cable.
https://www.amazon.co.uk/Charge-Cha...68&sr=1-21&keywords=qualcomm+quick+charge+3.0
I have this one and its perfect always shows fast charging on the phone
Also if you are using a fast charger 2.0 with the screen on it will show cable charging. It will only fast charge with the screen off.
Firstly..more than likely it's the cable(s) you're using. Usually it's the brand/quality of cable that affects charging rates more than anything.
Secondly... with how advanced these chargers and phones are now with QC and all the varying voltages etc..it would behoove you to maybe spend a few extra bucks and go with a high quality power adapter instead of cheap, China mad junk that could potentially seriously damage your phone or battery. The Original Samsung adaptive fast charging adapters-with cable are pretty cheap from numerous outlets. Outside of original Samsung chargers, I've only ever used adapters by Anker. Never had a problem with them and always fast charge with either original cable or the other type of cable I use; wich is the "Snowkids USB type C" on Amazon. Bestseller there.
https://www.amazon.com/Snowkids-Bra...d=1510152529&sr=8-3&keywords=usb+type+c+cable