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I think there is a serious problem with my charging circuit on this phone. I have no idea if its hardware or software that is controlling the charging circuit but I can tell you that it literally takes forever to charge my phone via USB and this is unacceptable from a consumer standpoint.
I wanted to see how much current the phone was asking for and I was really surprised to see 96mA!!!
No wonder its charging so slow, something is really wrong here, and It doesnt look like a faulty battery. The phone should be asking for 10x this much current.
Can some people post how much current their phones are drawing from the usb port?
If you dont know how to do this, in "device manager" double click on the appropriate "usb root hub" that your phone is connected to and click on the "power" tab. Post results.
You are trying to charge your device on a pc correct?
Sent from my HTC Vision using XDA App
500mah is the max just about any phone will charge at from a usb port, at least without any modifications like fast charge drivers.
USB current, for charging purposes, is and always will be low. Otherwise you would burn up your motherboard. Alternatively it would let the magic smoke out of your phone and it would quit working properly.
Sent from Bonsai 6
+1 to the two posts above me. I suggest getting a wall adapter for your usb and charging it there, you will get vastly superior charging times
Sent from my HTC Vision using XDA App
Top Nurse said:
USB current, for charging purposes, is and always will be low. Otherwise you would burn up your motherboard. Alternatively it would let the magic smoke out of your phone and it would quit working properly.
Sent from Bonsai 6
Click to expand...
Click to collapse
USB current, for charging purposes, should be and always be 500mA. 96mA is not enough to charge one of these phones. You cannot burn up your mother board if the device calls for more than 500mA, as that is all that is available for each usb port.
Ive connected three of my old phones and an EVO and a mytouch Slide, they all ask for the maximum allowed current as they should. I do have a wall charger and it charges fine, Im trying to see if everyone else has the same USB charging problem as me, or if I have a broken phone, or if I just have some bad software on my phone.
Please if anyone can post results it will be helpful.
Hello again,
My G2 is asking for 500ma
Sent from my overclocked G2
PaganAng3l said:
Hello again,
My G2 is asking for 500ma
Sent from my overclocked G2
Click to expand...
Click to collapse
thanks but can you please post results for the an EPIC 4G phone?
Connected to a PC USB port, the Epic 4G will only draw 380ma. Via a wall charger is will only draw 600ma. Hence why charging on a PC is slower. Simple as that.
I also show exactly 96 mA, regardless of which USB port I am plugged into. Practically new motherboard, so I know the USB current isn't an issue. New Blackberry USB cable (far superior to stock Samsung cables).
IIRC, 500ma is the max draw per hub, not USB port. This is why people get powered add on hubs so they can have components that take more draw than a computer USB port will give.
Sent from Bonsai 6
Top Nurse said:
IIRC, 500ma is the max draw per hub, not USB port. This is why people get powered add on hubs so they can have components that take more draw than a computer USB port will give.
Sent from Bonsai 6
Click to expand...
Click to collapse
500Ma is NOT the per 'hub' power supplied, 500Ma is the PER PORT current max. EACH port on the motherboard will supply up to 500Ma, trying to draw more will not work. It won't burn it out, it just won't supply any more than that. If you have 8 ports on your MOBO, you will get a total of 4A of current in total, not exceeding 500Ma per port. If you hookup an UNPOWERED hub to your mobo, the total draw still cannot exceed the 500Ma. If the hub is powered, it will provide 500Ma to each port on it, and draw virtually none from the MOBO.
This is why you see some external devices with dual USB cords, or a single with a Y. This is because it will combine the 500Ma from each port to power the device for up to 1A of current.
96Ma will not charge the phone, it's not even enough to power the phone while making a call.
How are you measuring your current draw? Try other USB devices. Wall charging takes between 2 and 3hrs to charge depending if the phone is on and its current draw for what it's doing.
Top Nurse said:
USB current, for charging purposes, is and always will be low. Otherwise you would burn up your motherboard. Alternatively it would let the magic smoke out of your phone and it would quit working properly.
Sent from Bonsai 6
Click to expand...
Click to collapse
Pretty much every USB host device I've used can easily deliver 1A. Most new machines can deliver 2A (such as ASUS boards and Macs) over USB. The Epic still charges way too slowly even off a wall charger. It'd be nice if it drew 1A instead of ~600mA. Most other devices use much higher charge currents when plugged into AC.
As for the Epic's charge current, I think the USB driver on it just reports charge current incorrectly.
Orbiting234 said:
Connected to a PC USB port, the Epic 4G will only draw 380ma. Via a wall charger is will only draw 600ma. Hence why charging on a PC is slower. Simple as that.
Click to expand...
Click to collapse
thanks to the two people, that haven't been derailing this thread into a "how usb ports work discussion".
if anyone wants to help instead of arguing over how usb ports work, it would be really helpful to know what rom and kernel you are using when you tested your epic 4g device.
Im especially interested to know this information about orbiting who is getting 380mA. Im also interested in how you measured measured the 600mA from the wall charger.
Its posted at the end of the OP how to see how much current your phone is asking for.
I think the charge controler on the Epic will alter the current draw depending on how close it is to fully charged . Once it gets above about 90% charge the current should taper off. this is to prolong the battery life.
The Normal charging times starting at about 30% is under 3 hours on a wall charger for me. I can go from about 70% to 100% om my laptop in about an hour.
poit said:
I think the charge controler on the Epic will alter the current draw depending on how close it is to fully charged . Once it gets above about 90% charge the current should taper off. this is to prolong the battery life.
The Normal charging times starting at about 30% is under 3 hours on a wall charger for me. I can go from about 70% to 100% om my laptop in about an hour.
Click to expand...
Click to collapse
I already know this, and its not what I asked for.
poit said:
I think the charge controler on the Epic will alter the current draw depending on how close it is to fully charged . Once it gets above about 90% charge the current should taper off. this is to prolong the battery life.
The Normal charging times starting at about 30% is under 3 hours on a wall charger for me. I can go from about 70% to 100% om my laptop in about an hour.
Click to expand...
Click to collapse
mrhocuspocus said:
I already know this, and its not what I asked for.
Click to expand...
Click to collapse
I appologize for wasting your time, but let me elaborate.
Right now my phone is at 89% charge, and right now the "Power Required" field in the USB root properties is showing 96 ma. I doubt that is an actual measured current, more likely it's what the port controller on the Epic reports as a minimum current required. What I can tell you is that even with that info, my phone charges fine. Seems unlikely that it's only supplying 96ma because I'd expect the phone must draw 40 ma or so just to idle.
What would be more useful would be an app on the phone that polled the charge controller to give us actual voltage and current data. I had one on my old TP2 that was great, but I don't know about one for Android.
Edit: in the time it took to type this reply the State of Charge went from 89 to 92%, yet the properties still shows 96 ma. I think the controller is getting way more than 96ma, so that number is likely bogus.
I guess that wasn't what you asked for either, but maybe it is stilll useful
poit said:
the USB root properties is showing 96 ma. I doubt that is an actual measured current, more likely it's what the port controller on the Epic reports as a minimum current required.
I guess that wasn't what you asked for either, but maybe it is stilll useful
Click to expand...
Click to collapse
no need to apologize, I could explain to you why what you think is "more likely" is actually less likely. but it would only further derail this thread. feel free to pm me if you are interested.
all im interested in is three things:
current asked for by phone from pc usb, rom version, and kernel version.
someone already reported 380mA. but i have no idea what software he is on.
I'm running completely stock EB13. On my newer laptop with Windows 7 it shows 96mA in the device manager. On my ancient Dell PC at work running XP, it shows 96mA as well. In both cases I'm plugging the phone directly into a USB port, no external hubs.
xxmastermindxx said:
I also show exactly 96 mA, regardless of which USB port I am plugged into. Practically new motherboard, so I know the USB current isn't an issue. New Blackberry USB cable (far superior to stock Samsung cables).
Click to expand...
Click to collapse
I'm running the latest Syndicate 1.0.1 with their latest 1.0.3 kernel. My quote above is when I was running Syndicate 1.0.0 and kernel 1.0.1.
If I go back to stock for some reason, I'll post those numbers up too.
Sent from my SPH-D700 using XDA Premium App
That allows the micro usb to put out more voltage to support more usb storage devices that require more than the 100v of power that it puts out by default?
Sent from my ADR6400L using Tapatalk
It's impossible, it's an electronical limit, the device can't do it physicaly, that's all, sorry ^^
So will a powered usb hub work for that type of thing?
Sent from my ADR6400L using Tapatalk
iflip said:
So will a powered usb hub work for that type of thing
Click to expand...
Click to collapse
Yes, it will.
Great. But does the powered hub have to be the type that needs an a/c adapter or can it be a self powered hub? Sorry to be a nuisance with the questions.
Sent from my ADR6400L using Tapatalk
a bus powered hub wouldn't make any sense, would it? how should it get more power than the device can deliver by it's physical limits?
so answer is clear: No, only powered (yes, the ones with own batteries or A/C adapter) hubs will do the job.
I think he was talking about battery powered hub, and i think it could work ^^
Hehe, I can't believe nobody made a joke about saying 100v instead of 100mA.
Anyways, you could also splice 5v into your usb cable, either from a wall wart or from batteries, but if using batteries, I'd use a lithium ion pack and a boost converter, something like a Texas Instruments TPS55065QPWPRQ1.
msticninja said:
Hehe, I can't believe nobody made a joke about saying 100v instead of 100mA.
Click to expand...
Click to collapse
Yeah dude, very funny joke...
chulri said:
Yeah dude, very funny joke...
Click to expand...
Click to collapse
Sorry, I thought I was in the company of nerds here.
Thread moved to proper forum as not development
100mah yea my bad.
Sent from my ADR6400L using Tapatalk
iflip said:
100mah yea my bad.
Sent from my ADR6400L using Tapatalk
Click to expand...
Click to collapse
Lol, no problem. I mix things up all the time. I was just surprised someone hadn't jumped on you for it. But for the record, mA, not mAh. mAh is milliamp-hours, which refers to a batteries capacity, not the amount of current being consumed.
Okay, gotta get the OCD in check and stop correcting people now.
Seriously though, it wouldn't be hard to splice some power into a usb cable. Just slice through the outer sheath, melt a section of the sheathing off the red and black wires, and solder on a 5v wall adapter. Maybe a diode to shunt current only to the drive and not the archos, probably not necessary though.
To use batteries, you'll probably need to regulate the voltage. Most usb MCUs only accept about 4.5v to 6v, so 4 AA batteries(1.5Ah/6v) being drawn at ~400mA would probably sag under 4.5v pretty quickly. Thus, you'd need lithium ion, but you can only get them at 3.7 or 7.2 volts, meaning it would need to be voltage (and amperage) regulated.
Maybe there's enough demand for me to build a prototype and have it produced? It would probably run $40-60 USD if mass produced, but you could build one at home for $20 if you have a spare usb cable.
Hey msticninja
msticninja said:
Seriously though, it wouldn't be hard to splice some power into a usb cable. Just slice through the outer sheath, melt a section of the sheathing off the red and black wires, and solder on a 5v wall adapter. Maybe a *diode to shunt current only to the drive and not the archos, probably not necessary though.
To use batteries, you'll probably need to regulate the voltage. Most usb MCUs only accept about 4.5v to 6v, so 4 AA batteries(1.5Ah/6v) being drawn at ~400mA would probably sag under 4.5v pretty quickly. Thus, you'd need lithium ion, but you can only get them at 3.7 or 7.2 volts, meaning it would need to be voltage (and amperage)...
..........but you could build one at home for $20 if you have a spare usb cable.
Click to expand...
Click to collapse
Are there any links to detailed online instructions on how to build that setup? I really need this. (it would help me earn extra cash)
Sent from my ADR6400L using Tapatalk
I just ordered one of these:
tinyurl.com/3mzzzz5
in hopes to deal with the above problem. It claims to have a built-in battery (in other ads for this product), but unsure of it's capacity (700 mA perhaps). Reading between the lines on other poorly translated ads it claims to be able to power a hard drive (a 2.5" laptop drive I'm assuming). It also comes with a boat-load of adapters to all kinds of small devices, so I figure it might be useful elsewhere if it doesn't work out for this.
Anyway when I get it, I'll report back on how well it works.
Thanks. It looks promising. And if our works I'm definitely gonna get one.
Sent from my ADR6400L using Tapatalk
wartstew said:
I just ordered one of these:
tinyurl.com/3mzzzz5
in hopes to deal with the above problem. It claims to have a built-in battery (in other ads for this product), but unsure of it's capacity (700 mA perhaps). Reading between the lines on other poorly translated ads it claims to be able to power a hard drive (a 2.5" laptop drive I'm assuming). It also comes with a boat-load of adapters to all kinds of small devices, so I figure it might be useful elsewhere if it doesn't work out for this.
Anyway when I get it, I'll report back on how well it works.
Click to expand...
Click to collapse
That's the general idea, but the hub may need drivers that android doesn't have, and don't expect much from the solar cell. I'm guessing less than 100mA in bright sun, but it'll be interesting to see. A 2.5 inch drive should be able to power off the host USB, but if you connect two through that hub, I doubt you'll be able to get a good spin up.
Iflip: This is basically what you want to build: http://www.ladyada.net/make/mintyboost/
You would just need to add another usb port connected directly to the pins of the port he's using to charge from. The "minty charger" would supply the extra mA, and the data pins would connect straight through the two usb ports into the Archos, so you wouldn't have to worry about drivers or anything.
Basically, if you can find any USB charger, and add another port to it, so both the archos and the hard drive can be plugged into the same charger, you'd be golden.(As long as you connect the data pins on both together) You could even add a port to an old Ipod wall charger, anything that provides power to usb devices. You just have to add another port to it, matching the 4 pins, which is easy. +5v to +5v, ground to ground, data + to data +, and data - to data -. I think you get the picture.
iflip said:
That allows the micro usb to put out more voltage to support more usb storage devices that require more than the 100v of power that it puts out by default?
Sent from my ADR6400L using Tapatalk
Click to expand...
Click to collapse
Yes there is.
A very bad a simple hack can provide more than 100mA to the USB port.
I had 1 usb key working and others not working due to this limitation. This got me really upset!
I've search the kernel sources, hacked quickly the kernel, build a new one, flashed it on my A70S running UrukDroid 1.0, and voila! My key is now working (with a 200mA limit on the port instead of 100mA)
Here is the kernel/initramfs for UrukDroid 1.0 build with $auron kernel sources (1.1b3 kernel).
It has Cgroups with cpuacct based on UID grouping (like HTC does on the Desire), but the rest is pretty much standard and is build with $auron's settings.
Flash it with SDE.
Don't blame me tho if you toast your USB port! It's working for me with a USB key, it may not with a USB hdd. I've set the limit to 200mA and not 500.
eagleofdeath13 said:
It's impossible, it's an electronical limit, the device can't do it physicaly, that's all, sorry ^^
Click to expand...
Click to collapse
Are you 100% sure? I'm getting apparently more than 100mA out of my USB to power my greedy USB flash disk
Cheap battery powered USB hub worked with my A70S
So I bought a DTech DT-4012 from tmart.com and it [mostly] worked with my A70s!
It is a cheap solar & battery powered USB hub.
It powered a USB mouse and keyboard just fine. This is real handy especially when you are trying to use the A70 with an external display through the HDMI an HDMI cable. I get a normal mouse pointer and a functional keyboard.
It even powered a 2.5" laptop hard drive, but only for about a minute or two, enough time for at least my A70S so mount the file system, but not much more.
Of course it powered less power hungry things like USB "thumb" drives and card readers fine too, this included ones that the A70 could not power by itself.
The thing contains a [small] 700mA Li-ion battery and a voltage converter that produces a steady 5V out the USB ports for as long as it can. It is possible that the short run time for the hard drive could be an overheating problem with the voltage converter that might be solvable with an addition of a small heat sink. It is also possible that I don't have a full charge on the battery yet (although it claimed it did as the "charging light" went out), but this was the units first time use so the battery might just need some cycling. I'll investigate all these ideas further.
The unit does NOT have a connector for external power but I'm thinking of adding one so I can plug in AC adatpers and/or larger battery packs. This is assuming this is what is needed to get reasonable life running a 2.5" hard drive.
Oh and on the solar cell: I don't expect much power from the approx 2" diameter cell, it would probaby charge a small mobile phone about 1/2 way if you left it out in the sun all day. It is probably more useful as a trickle-float charger for the internal battery as in average ambient light might keep the battery topped off as it is being stored.
Finally the thing comes with all kinds of USB adapter cables for mostly older mobile phones. Could be useful to some.
Is this possible? TIA
i agree. Possible? ( probably not with the propitory charging plug) thanks for asking though
As said before, no.
no
USB can't provide the power needed. This device is a cell phone size components inside.with huge batteries to power the display.yes I have had my tab apart..
Sorry
The batteries in it are too high voltage and require too much current. If you want to torture your device you could make a 5v to 12v dc->dc converter that would give around 200mA (depending on efficiency) but the charger for it gives 1.5A so even if it did work, you wouldn't be able to charge the device, just increase how long it runs on battery.
Err... but that's probably getting into WAY too much detail.
Not possible is the easy answer.
loialotter said:
The batteries in it are too high voltage and require too much current. If you want to torture your device you could make a 5v to 12v dc->dc converter that would give around 200mA (depending on efficiency) but the charger for it gives 1.5A so even if it did work, you wouldn't be able to charge the device, just increase how long it runs on battery.
Err... but that's probably getting into WAY too much detail.
Not possible is the easy answer.
Click to expand...
Click to collapse
Just a no works well most of the time giggles
I also noticed the only way to charge is the included power supply, I didn't check that at all, what's the output of that power supply? Anyone knows?
loialotter said:
The batteries in it are too high voltage and require too much current. If you want to torture your device you could make a 5v to 12v dc->dc converter that would give around 200mA (depending on efficiency) but the charger for it gives 1.5A so even if it did work, you wouldn't be able to charge the device, just increase how long it runs on battery.
Err... but that's probably getting into WAY too much detail.
Not possible is the easy answer.
Click to expand...
Click to collapse
Even if one did such as you stated and used a converter that supplied 12v @ 1.5A (which they do make) spliced to a mini usb fitting....I think the risk of destroying the device or doing nothing is more than a possibilty. I could be wrong, but the mini USB port supplies output power like the USB 2.0 port. So I can only assume that diodes or whatever precautions manufactured will prevent input power. Just as headphones out will always be output and nothing used can change it otherwise, unless internal changes are made.
At any rate, not possible is the only answer.
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?
Click to expand...
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?
Click to expand...
Click to collapse
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?
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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.
Click to expand...
Click to collapse
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
Click to expand...
Click to collapse
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.
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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.
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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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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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Just as I presumed. Thanks
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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?
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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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Can anyone let me know if this is usual behaviour. For example when I plug in my Nexus 7 (2013) into my Macbook Air it only pulls 500mA, and it will actually discharge if you use it while it's 'charging'. When I plug in my iPad 3 it draws 500mA + 2100mA. Can only Apple devices draw extra current over PC and Mac? The Nexus seems to have a problem with my Gigabyte PC too which uses on/off charge to provide extra amps. The only way I can seem to charge it is using the provided charging adapter, even then it charges SO slowly.
Is this abnormal or normal behaviour?
Thanks a lot
Chompmacaa said:
Can anyone let me know if this is usual behaviour. For example when I plug in my Nexus 7 (2013) into my Macbook Air it only pulls 500mA, and it will actually discharge if you use it while it's 'charging'. When I plug in my iPad 3 it draws 500mA + 2100mA. Can only Apple devices draw extra current over PC and Mac? The Nexus seems to have a problem with my Gigabyte PC too which uses on/off charge to provide extra amps. The only way I can seem to charge it is using the provided charging adapter, even then it charges SO slowly.
Is this abnormal or normal behaviour?
Thanks a lot
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Click to collapse
Charge it in the wall?
Sent from my Nexus 7 using Tapatalk 4
Chompmacaa said:
Can anyone let me know if this is usual behaviour. For example when I plug in my Nexus 7 (2013) into my Macbook Air it only pulls 500mA, and it will actually discharge if you use it while it's 'charging'. When I plug in my iPad 3 it draws 500mA + 2100mA. Can only Apple devices draw extra current over PC and Mac? The Nexus seems to have a problem with my Gigabyte PC too which uses on/off charge to provide extra amps. The only way I can seem to charge it is using the provided charging adapter, even then it charges SO slowly.
Is this abnormal or normal behaviour?
Thanks a lot
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Click to collapse
As far as I know, per USB specification, each USB can only provide 500mA on each USB root hub (usually, one hub has two ports). So the maximum amperage you can drain from each pair of ports is 500mA
I don't know how your iPad can take 2100mA + 500mA from a single port. Otherwise, 2100mA is a huge amperage for such a tiny conector.
berserker_b2k said:
As far as I know, per USB specification, each USB can only provide 500mA on each USB root hub (usually, one hub has two ports). So the maximum amperage you can drain from each pair of ports is 500mA
I don't know how your iPad can take 2100mA + 500mA from a single port. Otherwise, 2100mA is a huge amperage for such a tiny conector.
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Have to agree. Max charge via USB 2.0 port will be 1A. Max charge from a USB 3.0 port will be 2.0A with the special USB3.0 cable. Since android devices only use standard wiring for a USB 2.0 port max charge from a PC will be 1A minus what ever the device is using.
Now separate power supplies will go up to 2.0A, or in the tablets case 5.2V @ 1.35A. Even the iPad max charge rate is 2A if not mistaken.
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Chompmacaa said:
Can anyone let me know if this is usual behaviour. For example when I plug in my Nexus 7 (2013) into my Macbook Air it only pulls 500mA, and it will actually discharge if you use it while it's 'charging'. When I plug in my iPad 3 it draws 500mA + 2100mA. Can only Apple devices draw extra current over PC and Mac? The Nexus seems to have a problem with my Gigabyte PC too which uses on/off charge to provide extra amps. The only way I can seem to charge it is using the provided charging adapter, even then it charges SO slowly.
Is this abnormal or normal behaviour?
Thanks a lot
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Click to collapse
I don't believe the Nexus 7 supports CDP detection - so it assumes all USB hosts are SDPs (only capable of 500 mA)
In addition, I believe the method Apple uses to signal CDPs is not compliant with the USB battery charging standard - so devices that follow the standard for CDP detection might not detect Apple's mangled crap as a CDP. I know with certainty that Apple does not follow the standard for signaling dedicated chargers.
Chompmacaa said:
Can anyone let me know if this is usual behaviour. For example when I plug in my Nexus 7 (2013) into my Macbook Air it only pulls 500mA, and it will actually discharge if you use it while it's 'charging'. When I plug in my iPad 3 it draws 500mA + 2100mA. Can only Apple devices draw extra current over PC and Mac? The Nexus seems to have a problem with my Gigabyte PC too which uses on/off charge to provide extra amps. The only way I can seem to charge it is using the provided charging adapter, even then it charges SO slowly.
Is this abnormal or normal behaviour?
Thanks a lot
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Click to collapse
Officially, USB 2 provides 500mA per port minimum. That is to say - it must not provide less than that.
USB 3's minimum is 900mA.
Technically, USB 2 and later ports can choose to either provide more current (typically, they provide a pool maximum - say 4000mA and it gets divided by the ports in use rather than ports available) or they clamp at the official limit and trip an overcurrent signal to the OS when a device is attached that draws too much current.
In the case of the iPad 3, it - like most larger tablets - needs 2.1A to charge (ie: 2100mA). But if you plugged it into a current limited USB port, it would trip the computer. Worse, if you plugged it into a computer that *doesn't* overcurrent limit your computer - and it exceeded the total power limit for the USB Hub, you can actually cause the computer to shut down. So nice devices negotiate for the current they need - or they stay at 500 or 900mA unless they know they're connected to a 'safe' source.
Samsung tablets, for example, have a circuit in their special cables that tells the tablet when it's connected to a charger versus a computer. In Apple's case, I suspect they've added something to their USB and MacOS that detects that you've plugged an iPad into it and switches on 2.1A power.
However, there's a similar thing called BC 1.1 which is an enhancement to USB 3 that allows a device that supports the standard to actually ask for more current specially for battery charging, and the Nexus 7 2013 does indeed support that standard. If you have the right motherboard (the one in my ASUS M11B for example), it will provide more power when you plug your Nexus 7 2013 into it.
Hope that helps.