Is the nexus 4 capable of fast charging the battery via USB? I tried different kernels/ROMs, but the toggle is not working and a search on xda didn't answer my question.
stivy73 said:
Is the nexus 4 capable of fast charging the battery via USB? I tried different kernels/ROMs, but the toggle is not working and a search on xda didn't answer my question.
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It is capable, for example franco kernel now supports enabling it from his kernel app. Some of them requires a little more work where you have to enable it by writing to a file. Just depends on what Kernel your on.
ibegary said:
It is capable, for example franco kernel now supports enabling it from his kernel app. Some of them requires a little more work where you have to enable it by writing to a file. Just depends on what Kernel your on.
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I've tried it.. I'm on Franco Kernel, tried enabling it through his app, but no luck
I also read it somewhere that people are getting problems using franko's app for enabling fast charge
u4atharva said:
I've tried it.. I'm on Franco Kernel, tried enabling it through his app, but no luck
I also read it somewhere that people are getting problems using franko's app for enabling fast charge
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Once you enable it you have unplug and plug in the cable. The fast charge only works when you're charging it on your computer and any USB port besides the wall outlet. When you do have fast charge enabled, the battery stats should read "XX% Charging (AC)" if fast charge is not enabled the parentheses should be (USB).
Sent from my Nexus 4 using Tapatalk 2
I actually have a question that may be off topic. Does the charging time matter whether you are using a USB 3.0 cable rather than a USB 2.0 cable or it doesn't matter cause the charging power depends on the adapter you use? Any chance that would help with Franco kernel?
Sent from my awesome Neo Armstrong Cyclone Jet Armstrong Nexus⁴ via Tapatalk
Kendaihou said:
I actually have a question that may be off topic. Does the charging time matter whether you are using a USB 3.0 cable rather than a USB 2.0 cable or it doesn't matter cause the charging power depends on the adapter you use? Any chance that would help with Franco kernel?
Sent from my awesome Neo Armstrong Cyclone Jet Armstrong Nexus⁴ via Tapatalk
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It doesn't matter. The Nexus 4's charging port will draw the amount of power it needs and that's it. USB 2.0 and 3.0 are just data transfer speeds. No relation in charging devices.
scream4cheese said:
It doesn't matter. The Nexus 4's charging port will draw the amount of power it needs and that's it. USB 2.0 and 3.0 are just data transfer speeds. No relation in charging devices.
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And usually it'll draw lower and lower as it gets closer to full charge (ie: if you're at 20% you're more likely to pull 800mA off a 2.1A charger than at 75% and up [which tends to be around 500-600]), also factoring in the actual drain of the phone being on. The phone is pretty smart about not risking to overcharge itself.
Works perfectly with Franco kernel
scream4cheese said:
Once you enable it you have unplug and plug in the cable. The fast charge only works when you're charging it on your computer and any USB port besides the wall outlet. When you do have fast charge enabled, the battery stats should read "XX% Charging (AC)" if fast charge is not enabled the parentheses should be (USB).
Sent from my Nexus 4 using Tapatalk 2
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Thanks man, that actually solved my problem
Hello,
I am having some problems with my battery life, this week i was watching a movie on my nexus 7 while it was charging.... when i checked my battery it was almost over. That was strange so i kept checking it until i saw the battery was going down while my device was charging. Well I don't know what's happening but, i don't think That's normal. Can I have some advice?
thank you.
Android 4.2.2 Stock Rom
Franco Kernel Last version ( r58 )
Nexus 7 16Gb
The screen draws a lot of power, especially if on full brightness. As such, there are scenarios when it is to be expected that your tablet is going to consume more power than a charger provides and the battery is going to have to make up for the difference. This is especially true if using a lower amperage charger.
Sent from my Nexus 7 using Tapatalk HD
Jpcsilva said:
Hello,
I am having some problems with my battery life, this week i was watching a movie on my nexus 7 while it was charging.... when i checked my battery it was almost over. That was strange so i kept checking it until i saw the battery was going down while my device was charging. Well I don't know what's happening but, i don't think That's normal. Can I have some advice?
thank you.
Android 4.2.2 Stock Rom
Franco Kernel Last version ( r58 )
Nexus 7 16Gb
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which charger did you use?
I have experienced very slow charging when not using the supplied usb charger.
WITH the supplied charger however it should be able to charge the battery while watching a movie.... even though when you are watching a movie you might just be drawing maximum power, since it might have to decode it + as the poster before mentioned, full screen brightness...
all stock
MFighter said:
which charger did you use?
I have experienced very slow charging when not using the supplied usb charger.
WITH the supplied charger however it should be able to charge the battery while watching a movie.... even though when you are watching a movie you might just be drawing maximum power, since it might have to decode it + as the poster before mentioned, full screen brightness...
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I am using the stock charger from asus + a usb cable to extend..
I had some problems uninstalling busybox, and i really don't know if this might be the problem.
I had problems with a USB extension before,(with male and female connections) if that's what you mean use a AC extension lead
yes
xxxo said:
I had problems with a USB extension before,(with male and female connections) if that's what you mean use a AC extension lead
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Yes using a male/female usb. Gonna test see if that is the problem.
I had this problem running SlimROM on my nexus 7. Swapped it for Sentinel ROM and instantly saw my battery increasing when plugged in no matter what I was doing on the device or which charger/cable I used. General performance increased too!
Wondering if anyone notice how slow it charges when it is connected to thru PC using USB (using original USB cable)?
I know it was not charging very fast when it was on 4.2.2, but 4.3 it is really slooooooooow...My N7 is pure stock 4.3 and so does its kernel.
jazzespresso said:
Wondering if anyone notice how slow it charges when it is connected to thru PC using USB (using original USB cable)?
I know it was not charging very fast when it was on 4.2.2, but 4.3 it is really slooooooooow...My N7 is pure stock 4.3 and so does its kernel.
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placebo?
were you using usb fastcharge on 4.2.2?
Unfortunately I am having similar problem with my nexus 7 after OTA 4.3; it charges so slow even though I plug charger in and try to use it while its chaging, device turns itself off saying please charge battery. How can it turn off when its already on the charger?
hagizma said:
Unfortunately I am having similar problem with my nexus 7 after OTA 4.3; it charges so slow even though I plug charger in and try to use it while its chaging, device turns itself off saying please charge battery. How can it turn off when its already on the charger?
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Has anybody heard of a kernel that fixes this? I love everything about 4.3 except that it charges sooooooo sloooooowwww!
I plugged mine in 5hrs ago @ 30% and it is up to 85% now... Ridiculous! This is using the original Asus charger.
Connected through PC only gives you about .5 amp charging rate. The stock charger gives 2 amps. If you aren't using the factory USB cable then most likely it is current limited and not applying full power while charging. If you are using the complete factory setup then whatever you are doing is causing the battery to drain faster than even a 2 amp charger can supply.
Sent from my Nexus 7(2012) that has zero issues.
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
taiwwa said:
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
Click to expand...
Click to collapse
You need an adapter to charge with computer or battery or anything besides the stock charger. I was trying to find one on ebay without success. I will look again. The one I have is made by Pizen and was $2.
http://www.ebay.com/itm/FOR-Samsung...=Laptop_Adapters_Chargers&hash=item1c36f25bea
You need something like this.
Sent from my GT-P6810 using xda app-developers app
taiwwa said:
I have a Verizon Galaxy Tab 7.7 i815.
It's an amazing tablet for video playback because of the large AMOLED screen. Comparable to plasma screens.
So, the problem I have is that while it's great for this, it is also extremely picky on the charger. Basically, the only thing I can get to recharge this is with the Samsung usb charger that plugs into power.
It will not even charge from the computer.
And of course, it refuses to charge from portable power banks. This is kind of a big deal because the battery life of this tablet is pretty bad, so being able to use a power bank would be great.
Any idea why this is? How to fix? Maybe I just have a bad unit? What's going on?
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Click to collapse
Mine (a P6800) charges normally from USB (only with the screen off and charges VERY slowly, though; despite the battery icon showing an "X") and from my power bank. That power bank is chinese, got it from DealExtreme, and puts out 2A of current (the same as the stock charger). The battery icon also shows an "X" when charging from it, though.
Are you sure it doesn't charge? Or does it display an "X" but still charges when not in use?
Steve_max said:
Mine (a P6800) charges normally from USB (only with the screen off and charges VERY slowly, though; despite the battery icon showing an "X") and from my power bank. That power bank is chinese, got it from DealExtreme, and puts out 2A of current (the same as the stock charger). The battery icon also shows an "X" when charging from it, though.
Are you sure it doesn't charge? Or does it display an "X" but still charges when not in use?
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Just for info.
The stock kernel will allow only USB charge at a rate of 450mA, regardless of a power bank or PC USB connection. Max AC is 1500mA.
my P6800/P6810 SkyHigh kernel will USB charge up to AC max (1500mA), using same device circuitry. The kernel is also modded to allow charging icon animation when connected to USB power source. This is because it thinks the source is AC. There are no System.UI.apk changes needed
Sent from my GT-I9500 using XDA Premium 4 mobile app
how do you install this?
taiwwa said:
how do you install this?
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Sorry, the kernel will only work on P6800/P6810 devices (if that's what you're referring to). Was was info about charging rates...
Sent from my GT-I9500 using XDA Premium 4 mobile app
UpInTheAir said:
Just for info.
The stock kernel will allow only USB charge at a rate of 450mA, regardless of a power bank or PC USB connection. Max AC is 1500mA.
my P6800/P6810 SkyHigh kernel will USB charge up to AC max (1500mA), using same device circuitry. The kernel is also modded to allow charging icon animation when connected to USB power source. This is because it thinks the source is AC. There are no System.UI.apk changes needed
Sent from my GT-I9500 using XDA Premium 4 mobile app
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AC max is 1.5A? Weird... The charger is good for 2A, and we've got more than enough battery to charge at 2A safely. Any way to increase the AC limit on your kernel, maybe configurable by a file/variable/etc?
And I'm pretty sure the device charges at more than 450mA from my power bank. Just checked, and realized that the charging icon appears normally (on stock 4.1 kernel). Galaxy Charging Current reports a 2A current on my S3 (Temasek kernel, adjusted for a maximum of 2000 mA on AC, 1200 mA on USB3 and 650 mA on USB2). Some power banks appear exactly like an AC charger as far as the USB connection is concerned.
Steve_max said:
AC max is 1.5A? Weird... The charger is good for 2A, and we've got more than enough battery to charge at 2A safely. Any way to increase the AC limit on your kernel, maybe configurable by a file/variable/etc?
And I'm pretty sure the device charges at more than 450mA from my power bank. Just checked, and realized that the charging icon appears normally (on stock 4.1 kernel). Galaxy Charging Current reports a 2A current on my S3 (Temasek kernel, adjusted for a maximum of 2000 mA on AC, 1200 mA on USB3 and 650 mA on USB2). Some power banks appear exactly like an AC charger as far as the USB connection is concerned.
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Why weird? Is all in the P6800 kernel source code.... I've not mentioned SGS3 ....
Those apps may just detect the source input, not the actual charge rate limited by kernel. Big difference afraid.
If the P6800 stock kernel detects it being charged as USB, all you will actually get is max 450mA. Same goes for AC, may show the source input greater, but charging rate is limited to max 1500mA. You can see my kernel commits on gitHub and study for yourself.
Remember, those charging current apps while useful, do have a large degree of variance as well.
Sent from my GT-I9500 using XDA Premium 4 mobile app
UpInTheAir said:
Why weird? Is all in the P6800 kernel source code.... I've not mentioned SGS3 ....
Those apps may just detect the source input, not the actual charge rate limited by kernel. Big difference afraid.
If the P6800 stock kernel detects it being charged as USB, all you will actually get is max 450mA. Same goes for AC, may show the source input greater, but charging rate is limited to max 1500mA. You can see my kernel commits on gitHub and study for yourself.
Remember, those charging current apps while useful, do have a large degree of variance as well.
Sent from my GT-I9500 using XDA Premium 4 mobile app
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Weird because the charger that comes with the P6800 is rated 2A, and the P6800 battery is big enough to charge at 2A and stay under 0.7C. There is no reason at all to limit the charge to only 1.5A, unless the circuitry won't handle that (which would be a bad screwup by Samsung). I just asked if it is possible to change this "hard" limit on your kernel. I didn't mention the I9300 on this point, only as an example of a device where this is adjustable on custom kernels (it's also adjustable on your I9500, by the way, check Perseus kernel).
Actually, that app detect the actual charge rate as limited by the kernel (on the I9300). That app doesn't work on the P6800, because the kernel doesn't output those values. On the I9300, some kernels allow you to configure the maximum input current (@5V, from the charger) and the maximum current output (@~4.35V, to charge the battery). But that is not important; my point was just that some power banks (like mine) have the exact same USB connection as a regular wall charger, so the phone/tablet/whatever sees it as a regular wall charger even on stock kernel. The OP could search for one of those, if his device charges normally from wall chargers it will charge from a power bank like this.
And BTW, Apple chargers are crap, they won't output full current unless they detect an Apple device. So, no Android/WP/etc will charge correctly from an Apple charger.
Steve_max said:
Weird because the charger that comes with the P6800 is rated 2A, and the P6800 battery is big enough to charge at 2A and stay under 0.7C. There is no reason at all to limit the charge to only 1.5A, unless the circuitry won't handle that (which would be a bad screwup by Samsung). I just asked if it is possible to change this "hard" limit on your kernel. I didn't mention the I9300 on this point, only as an example of a device where this is adjustable on custom kernels (it's also adjustable on your I9500, by the way, check Perseus kernel).
Actually, that app detect the actual charge rate as limited by the kernel (on the I9300). That app doesn't work on the P6800, because the kernel doesn't output those values. On the I9300, some kernels allow you to configure the maximum input current (@5V, from the charger) and the maximum current output (@~4.35V, to charge the battery). But that is not important; my point was just that some power banks (like mine) have the exact same USB connection as a regular wall charger, so the phone/tablet/whatever sees it as a regular wall charger even on stock kernel. The OP could search for one of those, if his device charges normally from wall chargers it will charge from a power bank like this.
And BTW, Apple chargers are crap, they won't output full current unless they detect an Apple device. So, no Android/WP/etc will charge correctly from an Apple charger.
Click to expand...
Click to collapse
Comparing kernels from different boards and CPU etc is like comparing apples and oranges.
If I could make the charge current configurable in my kernel, don't you think I would have already? Not everything is "cut and paste" and I expended allot of time in trying to port the mod for our current hardware.
Yeah, I've used just about all the kernels (at time of owing device) including perseus, siyah etc, do have good experienceI with configurable kernel charge. After using/having SGS2 x2, SGS3 x1, SGS4 x1 and SGT P6810 x1, it's not the first time I've heard of it.....
I won't be increasing max charge rate on the SkyHigh kernel above 1500mA. This generally increases battery heat and shortens lifespan.
On stock kernel + unmodified systemUI.apk for battery charge icons, if the kernel detects ANY charge source as USB, the max rate will be 450 mA. You will not see any battery charging animation (just the red x), which is a "sure fire way" to check.
In short, on our SGT-7.7, under stock conditions, if you connect ANY charging source and you DON'T have the battery charge animation, it will be USB charge at 450mA max.
Sent from my GT-I9500 using XDA Premium 4 mobile app
UpInTheAir said:
Comparing kernels from different boards and CPU etc is like comparing apples and oranges.
If I could make the charge current configurable in my kernel, don't you think I would have already? Not everything is "cut and paste" and I expended allot of time in trying to port the mod for our current hardware.
Yeah, I've used just about all the kernels (at time of owing device) including perseus, siyah etc, do have good experienceI with configurable kernel charge. After using/having SGS2 x2, SGS3 x1, SGS4 x1 and SGT P6810 x1, it's not the first time I've heard of it.....
I won't be increasing max charge rate on the SkyHigh kernel above 1500mA. This generally increases battery heat and shortens lifespan.
On stock kernel + unmodified systemUI.apk for battery charge icons, if the kernel detects ANY charge source as USB, the max rate will be 450 mA. You will not see any battery charging animation (just the red x), which is a "sure fire way" to check.
In short, on our SGT-7.7, under stock conditions, if you connect ANY charging source and you DON'T have the battery charge animation, it will be USB charge at 450mA max.
Sent from my GT-I9500 using XDA Premium 4 mobile app
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I didn't say it would be an easy/simple port, I just asked if it was possible. I didn't look at your github (and I have almost no experience with the P6800 kernel)... You know your sources better than anyone else, so I assumed you would understand better than I do what (and where) would need to be changed. I'm not diminishing your work or your effort in any way, shape or form; I respect the developers who stuck with this amazing device for so long, and who continue to make it usable way past what Samsung intended.
Our battery has a total capacity of 5100 mAh. From http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries:
The charge rate of a typical consumer Li-ion battery is between 0.5 and 1C
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That gives us a "safe" maximum charging rate of between 2550 mA and 5100 mA. 0.7C is generally agreed as a good rate for this first stage charge for Li-Po batteries, which means 3570 mA; the regulators on the tablet will reduce the rate when needed. Generally, charging Li-ion/Li-po batteries at such a low rate (~0.3C) is detrimental to the battery max charge, and a major screwup by Samsung (and explains why my P6800's battery doesn't last as long now as it did on its first month); that is why I asked. But that was just a question. If you won't do it, I respect your position.
About charging from the power bank, I don't get your point. As I said, when I plug my P6800 on my power bank, I don't get the red X; I see the regular charging animation, and the device charges as fast as it does on the stock wall charger (which is just an adapter that presents an USB connection where you plug the tablet's cable). I understand that when the tablet recognizes it's on a standard USB port, it will use the lower charge rate. But "power-only" USB ports, such as the one on the Samsung wall charger and the one on some power banks, will be recognized as power-only connections (or as the same as the Samsung wall charger), and will charge the device as fast as the kernel allows.
My power bank (this model to be precise) is detected as an AC charger on both my I9300 and my P6800, and would be a good option for the OP.
Don't get my point? Please 're-read the last paragraph in my previous post carefully.... I wasn't disputing your claim, but explaining about the battery charge icon.
Obviously your power bank has some "trickery" to fool the device as AC charge. Probably a resistor combo across the lines inside the source. This being the case, makes a good option for OP (or anyone else) on stock.
UpInTheAir said:
Don't get my point? Please 're-read the last paragraph in my previous post carefully.... I wasn't disputing your claim, but explaining about the battery charge icon.
Obviously your power bank has some "trickery" to fool the device as AC charge. Probably a resistor combo across the lines inside the source. This being the case, makes a good option for OP (or anyone else) on stock.
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Click to collapse
yeah, one of my power banks would trick my tab on one of its ports. some resistor thing.
Its due to having resistors put across the data lines.
This is done to trigger the tablet into AC charging mode.
the wall charger has this done to it.
some batterys have a samsung charger cable or a micro usb adapter.
This adapter has resisters inside it.
i have one of these and charges on ac charging.
if i get another cable such as data or car charger etc..
it wont trigger charge even on 2 amps.
good news is a adapter can be made to go from usb to usb...look it up it has 2 resisters in it and also shorts the data lines to each other.
MRBR7 said:
Its due to having resistors put across the data lines.
This is done to trigger the tablet into AC charging mode.
the wall charger has this done to it.
some batterys have a samsung charger cable or a micro usb adapter.
This adapter has resisters inside it.
i have one of these and charges on ac charging.
if i get another cable such as data or car charger etc..
it wont trigger charge even on 2 amps.
good news is a adapter can be made to go from usb to usb...look it up it has 2 resisters in it and also shorts the data lines to each other.
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Click to collapse
Just as I presumed. Thanks
Sent from my GT-I9500 using XDA Premium 4 mobile app
I have a charger that has two usb ports in it. One says ipad and the other galaxy tab.
If I use the ipad one and use it on the 7.7 it thinks an usb device is connected, shows the charging icon and also the red x, but doesn't charge. I think it just has to do with the voltage it receives on certain pins, but what is the meaning of the cross?
Menster said:
I have a charger that has two usb ports in it. One says ipad and the other galaxy tab.
If I use the ipad one and use it on the 7.7 it thinks an usb device is connected, shows the charging icon and also the red x, but doesn't charge. I think it just has to do with the voltage it receives on certain pins, but what is the meaning of the cross?
Click to expand...
Click to collapse
As it will accept a max of 450mA on detected "USB charge", it still should charge, but very slowly.
If you leave the screen off for a while, you should see the battery % indicator increase. If you use the tab while on detected USB charge, the device may consume more current than 450mA, hence the battery % indicator may not increase but instead decrease.
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