Develop Bugs

USB Charging ridiculously slow

Can someone tell me why when I charge it from my high power USB port on my new macbook pro this thing charges interminably slow? I've had blackberrys, ipods, iphones, and a g1, and NONE of them charged this slow.... thanks!

I am pretty sure the phone has a built in charge regulator so that when it detects a usb it caps the voltage (regardless of if you have a high powered usb or not) Have read a few posts on this but caant remember off the top of my head. But i do know on any usb i have tried high powered or not it takes about 2x as long to charge.

usb charging always takes more time.

It's to prevent the cable and the usb port from frying from a higher voltage. Thus they capped the charging rate via usb.

The charging controller in the phone limits charge current draw to 500mah maximum when plugged into USB. This is to protect the USB ports in the computer since they're not designed for more than that. When on AC power, it will allow up to 1000mah.

charges at the same rate for me from my PC.
Jobs probably put in some code of
If phone!=iPhone then
usb=1mah

Yeah I've noticed that with my iPhone my USB charging took 2-3 times longer than on AC power.
Noticed the same for my Evo, so it's nothing new to me.

So nobody has made a software update that disables the current regulator like they did back on the old WinMo handsets?

Also, USB ports on PC's aren't the most consistent about output. Good buddy of mine works in high end retail electronic displays, and always tests all voltages. It's actually not uncommon for a USB port on any PC to be ~300mAh. When you're in that situation, doesn't matter what the device caps. Oh yeah, and it also applies to Macs as well. Don't think you were getting off scott-free fanboys!

njs05 said:
Can someone tell me why when I charge it from my high power USB port on my new macbook pro this thing charges interminably slow? I've had blackberrys, ipods, iphones, and a g1, and NONE of them charged this slow.... thanks!
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No offense dude but this post reeks of fanboy "high power USB port?" lol

Anyone else have issues charging via computer USB?

I seem to have an issue that my phone never charges whilst connected via USB to my Macbook Pro. I have also tested on a Windows machine and have the same issue.
I was able to charge my Sensation over USB and I know that one of the ports on the Macbook has a higher output for charging but it makes no difference.
The phone states that it is charging but the percentage charge continues to drop. If I switch the power off it will charge. There doesn't appear to be any big battery drains though. I ran for a day and twelve hours over the weekend and charged at 40 percent.
Has anyone else the same issue?
Btw, I am on stock 4.0.2, rooted but not running anything else that should have any affect
Sent from my Galaxy Nexus using Tapatalk

How old is your macbook pro? Or more to the point, do you know if it has USB 3.0 ports? If your higher output ports are just 2.0 (and your computer is describing them as such compared to the older 1.0 spec) then you are stuck at 0.5A (half of wall charger output). USB 3.0 goes up to 0.9A, but I don't know if there are any catches in terms of devices needing to request the bump.
When you say that it charges if you switch the power off, do you mean it only works if you actually power down the phone? As in, leaving it sleeping plugged in, it still won't charge? Keep in mind that actively using the phone with the brightness turned up high could result in overpowering the .5A current in.
Unless you know someone else with a GN you can test you might just want to take it into the store and have them try it there/consider a replacement if it's defective. Also worth exploring if it's just the battery is defunct, if you have access to another one.

aidanbree said:
I know that one of the ports on the Macbook has a higher output for charging but it makes no difference.
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Really? Source?
Doing a tad of research it seems some models front (closer to the front) USB port has slightly higher output than the back (closer to the screen) USB port because the back one shares a USB controller with internal components.
It couldn't be noticeable though, they're both simply rated at .5A .
Has anyone else the same issue?
Btw, I am on stock 4.0.2, rooted but not running anything else that should have any affect
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I charge my 4.0.2 stock GSM Nexus off of my MacBookPro almost every night without issues. Using both an HTC cable and the Samsung cable.
JoeSyr said:
How old is your macbook pro? Or more to the point, do you know if it has USB 3.0 ports?
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MacBooks don't have USB 3.0. Its always been standard USB 2.0 afaik.
I'd also recommend that OP check different cables and computers, or different batteries if possible.

I have the exact issue. If I charge via USB on ANY laptop/computer it takes forever and if I'm using the phone as it's charging it uses more power than being supplied so it loses battery life even though it's plugged in.
I had this problem on my iPad too. It seems they need more power to charge but can still "trickle" charge off of a standard USB port.
My batter was at 10% last night, plugged it in to my laptop and sent some texts and left the display on (dev settings), about 10 min. latter it was at 4%.

I mean to post this last week!
See the screenshot....Status 'Charging' however as you see from the lower part of the screen, it has clearly stopped charging some time ago (about 3 hours earlier!)
It turns out that the CABLE was the issue....I thought all Micro USB cables were created equal, evidently not
Any ideas what the differences are in micro USB cables and how to identify which ones 'work' and which don't? I bought 10 from ebay which all seem not to charge from USB

I've had no problems charging via my pc using Samsung or Motorola cables. It charges slower but it still works.

[Q] Standalone USB Hubs that provide full 500 mA

I have a quest of sorts that I have been undertaking for a few months now. I want to find a USB hub that will charge many (i.e. 4 to 7) devices at once.
Originally, I though I had solved my quest with the acquisition of a simple powered USB hub. I could charge my many devices at one time, or so I thought. The devices charged somewhat slowly, but I didn't really mind, since I mostly used the hub for overnight charging.
But recently, I obtained an original Motorola Droid device, and found that it refused to charge if I simply connected it to my hub. Strangely, on another hub (which I had connected to a host computer), it would charge, but on the standalone hub (i.e. no host computer), it would not. So, I began to research (and found two helpful discussions on why and if such a thing exists).
After some research, I realized that my hub was probably not providing 500mA of 5V charge to any of my devices. It took the Droid refusing the paltry 100mA current for me to understand this. The devices that had accepted charge could just charge on 100mA of current, and now it makes sense why they seemed to charge more slowly.
It seems that all of the USB hubs I have or had tried don't have the proper controlling logic to "authorize" a device to draw more than 100mA. So, my quest has taken a new wrinkle to become: find a USB hub that will charge many devices at 500mA without having to connect to a host device.
Has anyone found any of these?

not sure if this would be what you would want but I found a 4 port charger a month ago and love it!
Its a scosche Model # QUSBH
Supplies 2a over 4 ports so 500mah to each one

blober54 said:
Supplies 2a over 4 ports so 500mah to each one
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All of my USB four-port hubs rate their power supplies as 5V @ 2A, but then only supply the 500mA when a host device (computer) authorizes the connection (so they never give more than the 100mA base current without a host).
Thanks for the suggestion, though!

I'm not recommended scosche product doue to I had scosche USB charger and it exploded when I charger my Iaudio I7.

palswim said:
I have a quest of sorts that I have been undertaking for a few months now. I want to find a USB hub that will charge many (i.e. 4 to 7) devices at once.
Originally, I though I had solved my quest with the acquisition of a simple powered USB hub. I could charge my many devices at one time, or so I thought. The devices charged somewhat slowly, but I didn't really mind, since I mostly used the hub for overnight charging.
But recently, I obtained an original Motorola Droid device, and found that it refused to charge if I simply connected it to my hub. Strangely, on another hub (which I had connected to a host computer), it would charge, but on the standalone hub (i.e. no host computer), it would not. So, I began to research.
(I can't post links without ten posts. I will post some of my research after I reach the threshold.)
After some research, I realized that my hub was probably not providing 500mA of 5V charge to any of my devices. It took the Droid refusing the paltry 100mA current for me to understand this. The devices that had accepted charge could just charge on 100mA of current, and now it makes sense why they seemed to charge more slowly.
It seems that all of the USB hubs I have or had tried don't have the proper controlling logic to "authorize" a device to draw more than 100mA. So, my quest has taken a new wrinkle to become: find a USB hub that will charge many devices at 500mA without having to connect to a host device.
Has anyone found any of these?
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Click to collapse
I'm wondering if you ever found a solution to your problem? I'm looking for a standalone charging station and it's quite a bit harder than I thought. Feel free to PM me if you found something or post here.

willowave said:
I'm wondering if you ever found a solution to your problem? I'm looking for a standalone charging station and it's quite a bit harder than I thought.
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I still haven't found this. I've been running a computer which connects to the USB hub more often as of late, but I am still searching for a solution.

Fast Charging USB Cable for Cars / laptop

Hey all,
The ONE gets too hot... Solved :good:
The ONE charges slowly... Solved :good:
My HTC ONE was charging very VERY slowly since I got it... And it was actually discharging slowly if plugged in and using navigation in the car..
Now, I don't have the original HTC car charger and its a stupid amount to pay for that...
I've used over a dozen of cables and chargers but none of them would charge properly...
Ordered this earlier this week and it got delivered today
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=321159008835&ssPageName=ADME:L:eek:C:GB:3160
Looks decent, and I would highly recommend it for anyone having charging problems with universal USB chargers.
Just tested it, I fired up Waze (which I usually use), Mobile Data, GPS, Skype in background and anything that would run in the background using as much power as it can .... Streaming Music over Bluetooth.. Screen was ON all the time with MAX brightness
My ONE slowly (really slowly) went from 53% to 54% ..:laugh::laugh:
Regarding ROM etc (if it makes any difference) , I'm running Viper One with ElementalX Kernel. 384Mhz Min and 1674 Max. Undervolted to -50mV & Fastcharge ... plus an Air Vent mounted phone holder for cooling features .. The ONE gets too hot
I can finally use the ONE as a proper nav, without having to worry about switching the screen off every now and then...

Sounds good, and in what charger you use?

Yet again, I must explain that cables do not differ if they are similar quality wise. All certified cables should be 24+ AWG btw. Don't be fooled by things like "fast charging." It mostly depends on the charger you're using. (Unless of course, you bought a crappy cable). Also should add that a 4 pin vs a 5 pin cable also creates a difference in charging time.

Kraize said:
Yet again, I must explain that cables do not differ if they are similar quality wise. All certified cables should be 24+ AWG btw. Don't be fooled by things like "fast charging." It mostly depends on the charger you're using. (Unless of course, you bought a crappy cable). Also should add that a 4 pin vs a 5 pin cable also creates a difference in charging time.
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That cable shorts the data lines to trick the phone into thinking it is connecting to a compatible charger. Any charger that supply 5V and >=1A should be fine with that cable. I would NEVER use the cable on a computer as the phone will try to pull as much as if it was on a wall charger some where around 750mA - 1A.

rancor22 said:
That cable shorts the data lines to trick the phone into thinking it is connecting to a compatible charger. Any charger that supply 5V and >=1A should be fine with that cable. I would NEVER use the cable on a computer as the phone will try to pull as much as if it was on a wall charger some where around 750mA - 1A.
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Which in turn would probably fry all your usb ports.

Kraize said:
Which in turn would probably fry all your usb ports.
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Yep, might not fry a powered USB 3.0 port but don't try this.

Many people (inc me) do not know that there are 24 AWG cable, and would use a stupid standard micro usb cable in to charge the phone in vain ...
Mpro747 said:
Sounds good, and in what charger you use?
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A standard USB port mounted on Cig lighter socket. It does the job right now
Kraize said:
Which in turn would probably fry all your usb ports.
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Click to collapse

Neelesh35 said:
Many people (inc me) do not know that there are 24 AWG cable, and would use a stupid standard micro usb cable in to charge the phone in vain ...
A standard USB port mounted on Cig lighter socket. It does the job right now
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you guys might wanna look at this sweet babe, you will know exactly how many hours to fully charge ur HTC One :silly:
http://www.thepowerpot.com/solar-power-optimized-practical-meter

hmm interesting, but if the 24awg cable has a potential of frying your usb port, guess what this one will do
Sent from my HTC One using Tapatalk 4

Neelesh35 said:
Many people (inc me) do not know that there are 24 AWG cable, and would use a stupid standard micro usb cable in to charge the phone in vain ...
A standard USB port mounted on Cig lighter socket. It does the job right now
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Click to collapse
The 24AWG wire used in the cable does nothing for helping your phone charge faster, its the fact that the two data lines are shorted in the cable. This tells the device that it is connected to a dedicated charger, even if it is not, and that it can pull however much current it needs.

Why would you buy a cable for this? Get the right charger in the first place and you wouldn't have this issue. Actual proper phone chargers already short the data pins (in fact, I'm surprised you found one that doesn't). Now you have a cable that cannot be used for anything other than charging.
Also, to whoever said this would fry USB ports: no, it wouldn't. Even with shorted data pins, the host machine still won't put any more power out than it is specified to. In fact, this means that using this cable, connected to a computer, would result in it charging SLOWER than if you allowed the phone to negotiate with the computer for faster charging.

Vincent Law said:
Why would you buy a cable for this? Get the right charger in the first place and you wouldn't have this issue. Actual proper phone chargers already short the data pins (in fact, I'm surprised you found one that doesn't). Now you have a cable that cannot be used for anything other than charging.
Also, to whoever said this would fry USB ports: no, it wouldn't. Even with shorted data pins, the host machine still won't put any more power out than it is specified to. In fact, this means that using this cable, connected to a computer, would result in it charging SLOWER than if you allowed the phone to negotiate with the computer for faster charging.
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Actual computers don't do a good job of limiting current they assume the device will satay within USB spec.

rancor22 said:
Actual computers don't do a good job of limiting current they assume the device will satay within USB spec.
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That couldn't be further from the truth. Windows even keeps track of the actual loads (it'll tell you when your USB host reports it cannot provide more power). The host decides how much power to provide the device anyway, it's not up to the device. If the device asks for 50 amps, the PC isn't going to try and serve that up. That would be insane and dangerous.
What it WILL do is start with an initial very low current (like 20mA IIRC). The device has its USB client chip powered by this, and uses it to negotiate. The device will then request however much current it needs. However, USB 2.0 spec states that the maximum is 500mA. The device can request more, but it by no means may expect to receive it. The PC may respond and say that it will only serve the maximum. Often it will respond by saying it will provide as much as it is capable (for some laptops and such, this could be as low as 500-600mA). The device must then deal with what it is given (it can use less, but it CANNOT draw more). Note that host devices can actually provide as little as 100mA if available power is limited.
However, many PCs nowadays are designed for charging, and provide over a full amp. They will do so during negotiation. If you use a charge only cable, you're gambling that the PC will go into a high current (AKA "take as much as we can offer") mode. Not all will do so. Some will follow the actual spec, and force the device into a lower power (100mA max, IIRC) current state, leaving you with basically no charging capability.

Vincent Law said:
That couldn't be further from the truth. Windows even keeps track of the actual loads (it'll tell you when your USB host reports it cannot provide more power). The host decides how much power to provide the device anyway, it's not up to the device. If the device asks for 50 amps, the PC isn't going to try and serve that up. That would be insane and dangerous.
What it WILL do is start with an initial very low current (like 20mA IIRC). The device has its USB client chip powered by this, and uses it to negotiate. The device will then request however much current it needs. However, USB 2.0 spec states that the maximum is 500mA. The device can request more, but it by no means may expect to receive it. The PC may respond and say that it will only serve the maximum. Often it will respond by saying it will provide as much as it is capable (for some laptops and such, this could be as low as 500-600mA). The device must then deal with what it is given (it can use less, but it CANNOT draw more). Note that host devices can actually provide as little as 100mA if available power is limited.
However, many PCs nowadays are designed for charging, and provide over a full amp. They will do so during negotiation. If you use a charge only cable, you're gambling that the PC will go into a high current (AKA "take as much as we can offer") mode. Not all will do so. Some will follow the actual spec, and force the device into a lower power (100mA max, IIRC) current state, leaving you with basically no charging capability.
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Windows keeps a record of what devices have requested, not what they are currently drawing. When you use the cable you are bypassing all if this( the software/embedded enumeration and negotiation for power) and then you are just relying on the hardware current limits. In an inexpensive system and possible even expensive ones the hardware probably only as one current limit if it has one at all. Lets say the USB protection IC as a current limit of 1A. A device that is connected with the charging cable is just going to pull current as if its hooked up to a wall adapter for this example let just say the phone draws 900mA. The dangerous part about this is that the computer has no idea this is going on, if the device doesn't enumerate the computer will never know its drawing current unless it trips an overcurrent limit.

rancor22 said:
Windows keeps a record of what devices have requested, not what they are currently drawing. When you use the cable you are bypassing all if this( the software/embedded enumeration and negotiation for power) and then you are just relying on the hardware current limits. In an inexpensive system and possible even expensive ones the hardware probably only as one current limit if it has one at all. Lets say the USB protection IC as a current limit of 1A. A device that is connected with the charging cable is just going to pull current as if its hooked up to a wall adapter for this example let just say the phone draws 900mA. The dangerous part about this is that the computer has no idea this is going on, if the device doesn't enumerate the computer will never know its drawing current unless it trips an overcurrent limit.
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Your entire post runs on the assumption that the USB host, for some reason, would have no way of controlling its power output other than an overcurrent limiter. Not only is this NOT what the USB spec states, but it's also so hilariously dangerous that if it were true, you'd be hearing about it all the time. It'd mean you could create a device that instantly pulls maximum current from the system, frying any system without an adequate overcurrent limiter.

Vincent Law said:
Your entire post runs on the assumption that the USB host, for some reason, would have no way of controlling its power output other than an overcurrent limiter. Not only is this NOT what the USB spec states, but it's also so hilariously dangerous that if it were true, you'd be hearing about it all the time. It'd mean you could create a device that instantly pulls maximum current from the system, frying any system without an adequate overcurrent limiter.
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I am not disagreeing with you that hosts can control and meter power but it does that by assuming the end device will also follow usb spec and is listening to what it is saying. So yes what I am saying is that for a device that does not follow USB spec and does not enumerate the only current control it receives is a hardware current limit. I don't know the whole usb spec well I know battery charging specifications so if this is completely wrong can you point me to the part of the USB specifications where it says the host must limit current draw. In a perfect system the hardware current limit will change as the host specifies how much power the device is allowed to draw, but more likely the protection IC(s) are just there in the case of a short, esd, or a device that is supplying power to the host (reverse current).

Bought a HTC CC-C200 some time ago for my HTC Desire where it did a nice job. Now with the One I encounter the problem that it discharges when being used (navi, scanning, ...).
Is there any newer original car charging cable that I can use? I do not want any 3rd party china cables

bliblablub said:
Bought a HTC CC-C200 some time ago for my HTC Desire where it did a nice job. Now with the One I encounter the problem that it discharges when being used (navi, scanning, ...).
Is there any newer original car charging cable that I can use? I do not want any 3rd party china cables
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Click to collapse
I just bought a RocketFish USB car charger and cable From BestBuy. It charges wicked fast, even when using navi and or streaming. I believe is is 10 watts and 2.1 amp output. That adapter will probably fix ya up, I used to have the same problem but not any more
Sent from my gimped not yet unlocked Verizon One

Slow charging on PC

Not sure if this has happen after the 8.1 update, but on my pixel XL I'm not longer able to get fast charging via usb type c to type c cable. I tried another cable that is known good and still doesn't work.
Factory usb type c cable works from wall outlet to phone. The phone will fast charge. Phone will not fast charge when connecting to pc (usb type c to type c. no adapters)
I tried to factory reset just now. Never unlocked the bootloader on this phone never installed any custom rom.
Safemode still does slow charging
Factory reset still does slow charging
Used SkipSoft Unified Android Toolkit to install drivers - still slow charging
Tried to change device from "charge only" to "transfer files" - slow charging
Any ideas?
Thanks.

that's normal. fast charging doesn't work with a PC, their USB ports charge at a lower rate...

nine7nine said:
that's normal. fast charging doesn't work with a PC, their USB ports charge at a lower rate...
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It did however did work at some given point. I was able to do fast charging on my pc. motherboard is a x370 SLI Plus from msi.
Edit : never mind you are correct. I was wrong. Thanks for the heads up.

ytv said:
It did however did work at some given point. I was able to do fast charging on my pc. motherboard is a x370 SLI Plus from msi.
Edit : never mind you are correct. I was wrong. Thanks for the heads up.
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all good. glad u sorted it out...
if you've ever noticed custom kernels that advertise 'USB fast charge' as a feature; those kernels can charge via your PC's USB ports faster.... it still doesn't give you actual fast charging, but it gives it a boost.

Hi guys,
I too experienced this change. My PCs used to charge my Pixel XL quite well, even faster than a wall charger. The phone would say "Charging Rapidly."
Looks like ever since the newest release, my PCs only provide "Charging Slowly."
What's the deal?

gooberphx420 said:
Hi guys,
I too experienced this change. My PCs used to charge my Pixel XL quite well, even faster than a wall charger. The phone would say "Charging Rapidly."
Looks like ever since the newest release, my PCs only provide "Charging Slowly."
What's the deal?
Click to expand...
Click to collapse
I think you are mistaken.... read my posts on the subject. USB ports don't support rapid charging and never have... there is a kernel patch that allows faster charging, but even then, it's still not as fast as a charger.

nine7nine said:
I think you are mistaken.... read my posts on the subject. USB ports don't support rapid charging and never have... there is a kernel patch that allows faster charging, but even then, it's still not as fast as a charger.
Click to expand...
Click to collapse
I am clearly not well-versed in the technological aspects of charging, I'm just telling you what I have seen and experienced with this phone.
- When I plug it into the wall - phone shows "Charging Rapidly....... XX%"
- If I use a crappy charger or regular USB cable - phone shows "Charging slowly....... XX%"
Up until a few weeks ago, my PCs (work and home, same motherboard, same USB-C outlets) would charge it blazingly fast - the same, if not faster than the wall charger.
I even used Ampere app on my phone which showed 1200-1500 mA charing.
Now Ampere shows 310 mA max wtf

gooberphx420 said:
I am clearly not well-versed in the technological aspects of charging, I'm just telling you what I have seen and experienced with this phone.
- When I plug it into the wall - phone shows "Charging Rapidly....... XX%"
- If I use a crappy charger or regular USB cable - phone shows "Charging slowly....... XX%"
Up until a few weeks ago, my PCs (work and home, same motherboard, same USB-C outlets) would charge it blazingly fast - the same, if not faster than the wall charger.
I even used Ampere app on my phone which showed 1200-1500 mA charing.
Now Ampere shows 310 mA max wtf
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Click to collapse
USB 3.x has a Max current of 900mA. that's in the specification... by default, your pixel would still only be using 500mA, but with the kernel patch that I spoke of; it bumps it to 900mA ...
I forget at what capacity, but basically it ramps down charging, after it hits a certain capacity, which might explain the 310mA in Ampere...
i don't know how you possibly could've been getting 1500mA out of a USB 3.x port from your PC, that exceeds the spec by a very large margin... not saying it didn't happen, but AFAIK that shouldn't even be possible.