Develop Bugs

USB charging and amperage??

What is the voltage and amps on the charger that came with Epic? I've got a bunch of charges around that are usually around 5V and .5A.
Just trying to lighten the load when I travel. Noticed the nook color charger: 5V, 1.9 A, and Kindle Charger 4.9V, .85 Amps. The one I'm on now is a Samsung 5V, .7 Amps.
What is the effect of using different rated charging on the Epic. Would the .85 Amp charger charge faster? Or too fast and cause damage?
Just wondering....

akenis said:
What is the voltage and amps on the charger that came with Epic? I've got a bunch of charges around that are usually around 5V and .5A.
Just trying to lighten the load when I travel. Noticed the nook color charger: 5V, 1.9 A, and Kindle Charger 4.9V, .85 Amps. The one I'm on now is a Samsung 5V, .7 Amps.
What is the effect of using different rated charging on the Epic. Would the .85 Amp charger charge faster? Or too fast and cause damage?
Just wondering....
Click to expand...
Click to collapse
could cause a potential over heat of battery

akenis said:
What is the effect of using different rated charging on the Epic.
Click to expand...
Click to collapse
USB operates at 5V, and any charger with a USB "type A" receptacle will output at 5V. Furthermore, it's safe to use the Epic with any USB-based charger.
Now, the problem is that the Epic will not draw more than 0.5 A from a USB port that isn't wired to the USB Battery Charging specification, so using a charger with a higher current rating will not charge faster if it doesn't meet that specification. Many chargers do, however, Apple uses an incompatible specification, so any iPhone/iPod-compatible, high current charger is of limited use on the Epic.
I've found that when you plug the Epic in, if the LED turns red and there's no "Select USB mode" menu, then the charger is properly compatible. If you do get a "Select USB mode" menu, then current draw is limited to 0.5 A and it will charge more slowly.
akenis said:
Would the .85 Amp charger charge faster?
Click to expand...
Click to collapse
The Epic itself appears to max out around 0.7 A, so the 0.85 A charger is unlikely to charge appreciably faster than the Samsung OEM charger. Assuming it follows the USB Battery Charging spec, it shouldn't be any slower either.
akenis said:
Or too fast and cause damage?
Click to expand...
Click to collapse
The charge current is actually phone dependent--the phone itself will never draw too much current and cause damage to the phone. Furthermore, the USB Battery Charging spec requires that phones (and other USB devices) implement sensing circuity to avoid overloading a charger.
In short, one of the design goals of USB is that, if you can physically plug a device into a receptacle, then it should do something reasonble, if not optimal, and never cause damage.

Yeah I've used my 1A chargers from my old Hero and they don't seem to charge any faster, nor overheat the battery than any extra than the standard charger.
Charging off USB sucks though (from a computer) 500mA is noticably slower than 700mA. I wish there was an app or mod to allow it to draw 700mA from a computer's USB port. I know USB 3.0 is safely able to supply 900mA so I'm curious if the device is configured to allow this. (unfortunately I do not currently have any computer with USB 3.0 but it's still something I'm interested in)
My old HTC TouchPro had a mod to allow full speed (I guess 1A charging) from the 5V port on my laptop and desktop. It never hurt my usb controller on either of them and they still work fine to this day. I swear I heard that USB 2.0 can unofficially support 900mA as well, which explains why my ports never burnt out from my TouchPro's added load

tazfanatic said:
could cause a potential over heat of battery
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And then this would happen:
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Totally kidding

No problems here using the 2A nook charger, 1A iphone charger or 700mA blackberry charger. As long as the charger is 700mA or better it'll fast charge. No such thing as too much amperage, the device will only draw what it needs. In the case of 500 mA, it'll slow charge. Any less than that and it's hit and miss, but probably won't charge at all.

insanity213 said:
No problems here using the 2A nook charger, 1A iphone charger or 700mA blackberry charger. As long as the charger is 700mA or better it'll fast charge. No such thing as too much amperage, the device will only draw what it needs. In the case of 500 mA, it'll slow charge. Any less than that and it's hit and miss, but probably won't charge at all.
Click to expand...
Click to collapse
Interesting.... tried the nook color charger and it doesn't fit. Looks kinda the same, but it's not. NC people said that device would not charge from computer USB.
Sent from my SPH-D700 using XDA Premium App

If you have a device that only pulls .8 amps and you hook it up to a 2 amp charger....guess how many amps it is going to pull? You guessed .8 amps. Woohoo!
Kinda like how your circuit for your bedroom is a 20 amp circuit. Does you alarm clock pull 20 amps now?

akenis said:
Interesting.... tried the nook color charger and it doesn't fit. Looks kinda the same, but it's not. NC people said that device would not charge from computer USB.
Sent from my SPH-D700 using XDA Premium App
Click to expand...
Click to collapse
I use the nook power brick with a standard microusb cable - like the stock epic one or a crackberry cable. The nook cable is different, but the USB port on the charger itself is standard.
And yes, the nook won't charge off of a PC. PC USB ports only deliver 500mA and the nook wants more.

+1.5A Dual Android wall charger?

I recently picked up an Anker dual car charger (link). It has two ports labeled Apple, the other Android. Both ports can supply 2.4A, for a total of 4.8A.
When I charge my phone from the Android side I get very close to 1A, but when I use the Apple side that goes down to around 500mA. To note, I used the same cable and only one port was used while testing. I used Battery Monitor Widget to track the charge rates.
Either side is strong enough to charge our phones, but it would be great if they both charges at full charge rates. So now I am looking for a wall charger and ideally I would like a dual port charger that can charge two Android devices at over 1.5A. I know we can't use 1.5A but it will future proof the chargers for a while, or will work with tablets.

SykesAT said:
I recently picked up an Anker dual car charger (link). It has two ports labeled Apple, the other Android. Both ports can supply 2.4A, for a total of 4.8A.
When I charge my phone from the Android side I get very close to 1A, but when I use the Apple side that goes down to around 500mA. To note, I used the same cable and only one port was used while testing. I used Battery Monitor Widget to track the charge rates.
Either side is strong enough to charge our phones, but it would be great if they both charges at full charge rates. So now I am looking for a wall charger and ideally I would like a dual port charger that can charge two Android devices at over 1.5A. I know we can't use 1.5A but it will future proof the chargers for a while, or will work with tablets.
Click to expand...
Click to collapse
Maybe look at getting a powered USB hub? I know the 2 I have at home can supply more than the 500mA USB2 spec as they've back powered my raspberry pi with a hdd attached before.

from my limited research, apple and android phones use different methods for signaling AC charging.
Android phones like to have the data pins in the USB cable shorted to each other to signal the phone for AC fast charging.
Not sure what Apple does, but it's not the same. That's why there are two different ports on the charger. Android ports have the data pins shorted together.
On a side note, you can also buy "charging only" cables on amazon that do the data pin shorting inside the cable. this may let you use your android phone with the apple labeled USB ports.

ez12a said:
from my limited research, apple and android phones use different methods for signaling AC charging.
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Click to collapse
This is correct. Apple devices want to see some combination of 2V and 2.8V on the data +/- lines to signal wall adapter charging. They do it this way because it allows the charger to tell the device what amperage it's capable of delivering (500mA, 1A or 2A) which is pretty cool.

It's been my impression that even using an charging only cable/adapter an Apple charging port will only give you 500 mA.
For what it's worth I recently emailed Anker about this and they said as much. I don't have an appropriate cable or charger to test it on. But Anker also told me they will be releasing new chargers in December that feature their smart charging port which detects what type of device you've attached (Apple, Samsung or generic Android) and then behaves accordingly. I just ordered one of their external battery packs (Astro3) which has one of these ports for 2.1A plus 2 x 1.5A Android ports. A similar AC charger would be nice if you can wait.

tmagritte said:
It's been my impression that even using an charging only cable/adapter an Apple charging port will only give you 500 mA.
For what it's worth I recently emailed Anker about this and they said as much. I don't have an appropriate cable or charger to test it on. But Anker also told me they will be releasing new chargers in December that feature their smart charging port which detects what type of device you've attached (Apple, Samsung or generic Android) and then behaves accordingly. I just ordered one of their external battery packs (Astro3) which has one of these ports for 2.1A plus 2 x 1.5A Android ports. A similar AC charger would be nice if you can wait.
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That is great to know. I can live with what I have until they release that charger. thanks.

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http://pages.ebay.com/link/?nav=item.view&id=111292550874
Pretty good deal, imo. Just arriwed, will share my experiences.
Nexus5 X Tapatalk Pro

Charging current

I just tested, and discovered something weird.
When using original HTC charger, and original HTC microUSB cable, the charging current is 1A, but when I use USB extension cable or spare microUSB cable charging current is 0.5A (490mA) using same original HTC charger.
What's wrong with the USB extension cable or spare microUSB cable?
Original charger and original cable
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Original charger, original cable through USB extension cable
Original charger spare microUSB cable
(spare microUSB cable is 1.6m long)
HTC ONE M8

I've moved this to Q and A - more suitable.
To answer your question - and I don't think your ammeter is particularly accurate - a USB port provides up to 0.5A. The Phone should only draw about 450mA (controlled by the phone) to leave a margin.
The mains adaptor will charge at a higher rate (again controlled by the phone) and in your case appears to be about 1A.
Note that the rate of charge from the mains depends on a number of factors - the temperature of the battery, the actual charge of the battery (the rate slows progessively from about 90% upwards and so on.

LenAsh said:
I've moved this to Q and A - more suitable.
To answer your question - and I don't think your ammeter is particularly accurate - a USB port provides up to 0.5A. The Phone should only draw about 450mA (controlled by the phone) to leave a margin.
The mains adaptor will charge at a higher rate (again controlled by the phone) and in your case appears to be about 1A.
Note that the rate of charge from the mains depends on a number of factors - the temperature of the battery, the actual charge of the battery (the rate slows progessively from about 90% upwards and so on.
Click to expand...
Click to collapse
Thanks for the answer, but I'm always using original HTC charger witch is 1.5A on the output side, only difference is extension USB cable.
When I connect to USB port on the PC always is 0.5A no matter what cable or extension cable I'm use.
Using extension cable has big difference, i don't know what the clue?
HTC ONE M8

The USB port will ONLY supply 450mA - 500mA (0.5A) - no more. It's limited by the USB 2 spec...
The HTC charger can supply UP TO 1.5A. However, the phone will only draw what it needs - in your case about 1A.
You can put a 5A charger on and it will only draw 1A...
EDIT: Just re-read your OP - the issue you have is likely to be related to the way the HTC USB charging cable is wired.
On some phones, when you connect to a USB port, the phone KNOWS it's a USB port due to the wiring. When you connect to a charger, the charger shorts a couple of pins together (or in Apple's case, a resistor) and the phone then KNOWS it's connected to a wall charger. That's how the phone tells you on screen what kind of charging you're doing...
Sounds like HTC use a proprietary cable...

Probably the phone is detecting voltage.
When I use short cable 25 cm or original microUSB cable voltage is 5.05V, with extended cable is little below 5V (4.95V) and then phone is changing with only 0.5A (490mA).
HTC ONE M8

Or proprietary cable.
HTC ONE M8

decmk said:
Or proprietary cable.
HTC ONE M8
Click to expand...
Click to collapse
That's the most likely. Bad HTC....!
The voltage is not the issue - it can be anything from 4.75V to 5.25V without problem.

S8/S8+ Power Delivery compatible chargers

When I plugged the S8+ into the MacBook 12's PD brick, it shows "cable charging". I thought the S8+ doesn't support PD. Today when I tried to use it with the rMBP USB-C PD brick, it activated Fast Charge. So the S8+ supports PD after all.
My USB-C 5V/3A portable battery and the Pixel XL / 6P bricks can't activate fast charge either.
If you know any other PD chargers that works with the S8/S8+, please share.
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I can confirm that this Aukey USB C Car Charger with Power Delivery works. I got this for the wife's car for her Pixel, but my S8+ also comes up as fast charging when I connect it.
This reddit post implies that in addition to the QC 2.0 fast charging (and since QC3 and 4 are backwards compatible any QC charger will work) it can also negotiate 5V at 3A over USB-PD, however (non-PD) Type-C USB charging can provide 5V @ 3A so it's more likely it's using that rather than USB-PD per se (though for all intents and purposes the end result is the same with regards S8+ fast charging) as long as the charger provides it.

Ive read that qualcomm 2.0 os basically 3 amps. So in theory any charger that provides 3amp output should work as fast charge

Nice find, thanks for the heads up (and a shame I don't seem to be able to find this one in the UK).
Do bear in mind the phone will draw a maximum 15W (either 9V @ 1.67A over QC2 or 5V @ 3A over USB Type C) even if the charger can provide more.

I assure you that the Flux Charger would be the best portable charger for your S8/S8+. One of my friends uses it for charging on the go. Also it provides fast charging.

How does this differ than Anker QC3 , other than type C;
https://www.amazon.com/dp/B01K9MQ8WW?psc=1

picrthis said:
Thanks for the info, I must admit I don't know much about PD
Click to expand...
Click to collapse
The Wikipedia article on USB, particularly the power section, is worth reading.

Incarniac said:
The Wikipedia article on USB, particularly the power section, is worth reading.
Click to expand...
Click to collapse
So it would seem with my S8+ and the Anker charger I gave the link to, there would be no real advantage switching to this one.........Anker chargers have been my go-to chargers for years, but I always keep an open eye to others

picrthis said:
So it would seem with my S8+ and the Anker charger I gave the link to, there would be no real advantage switching to this one.........Anker chargers have been my go-to chargers for years, but I always keep an open eye to others
Click to expand...
Click to collapse
Yeah, for the S8/S8+ it make no difference in terms of charging:
Incarniac said:
Do bear in mind the phone will draw a maximum 15W (either 9V @ 1.67A over QC2 or 5V @ 3A over USB Type C) even if the charger can provide more.
Click to expand...
Click to collapse
The phone doesn't actually use USB-PD either, but can fast charge using USB Type C, but it's often USB-PD chargers that gives that. USB-PD is more future proof for other devices, but right now there's no need to change your existing QuickCharge chargers or powerbricks.

djhulk2 said:
Ive read that qualcomm 2.0 os basically 3 amps. So in theory any charger that provides 3amp output should work as fast charge
Click to expand...
Click to collapse
Not exactly. With QC 2.0 the power supply can output 5, 9 or 12 volts, the phone will tell it what to output based on the battery level.. so if it's about completely dead it'll ask for 12 volts and as it gets closer to full back off to 5 volts. You need a power adapter that's compliant for that to work.

I received the Trianium charger over the weekend, it does fast charge off the USB-C port. One odd thing I've notice though is if I put my phone in my car mount while the charger has power, it goes into cable charge mode. Unplug and plug the other end back into the charger and it's in quick charge mode. Now if I put the phone in the mount before the charger gets power it works fine.

I recently got myself the AUKEY 27W Dual USB-C Port Car Charger. This is a USB Type C charger (and does not support USB Power Delivery) and with the built-in/attached USB-C cable it fast-charges my S8+ with the 5V at 3A that USB Type C allows for. The other port is a (non-USB-C and non-QuickCharge) USB charging port that can provide up to 2.4A.

Charging too slow from computer usb type c-c port not like other phone.

Hello, Everyone, I am new here, I got one question about charging the phone through a laptop. my laptop is ROG GL502VS, it has a usb-c port. When I used Razer phone, I always charge my phone through the laptop (USB-C to USB-C) the charging speed is so fast, i could say the speed equal to use adapter. but, when i change to Google Pixel 3 XL, i use usb type c port to charge my phone. it is really really freaking slow. I am really surprised. i don't know what happens, do you guy have the same problem as me? how to solve this problem?
FYI, Razer Phone have 4000 mAh battery bigger than Pixel 3 XL

Not all USB C is equal.
Pixels use Power Delivery or PD if memory serves.
So if your USB-C is not configured to make use of that bullsh*t proprietary power method then you will not achieve fast charge.

@parakleet, is there any way to configure PD? FYI, I do try maybe type c-c cable such as original pixel XL charger, MacBook type c charger and also razer type c charger.. none of them work

Megazia said:
@parakleet, is there any way to configure PD? FYI, I do try maybe type c-c cable such as original pixel XL charger, MacBook type c charger and also razer type c charger.. none of them work
Click to expand...
Click to collapse
No modifcations can be mde to PD that I am aware of.
It should work with all the OEM gear.
When you plug in the OEM charger and cable what does the standby screen say the state of charging is?
Have you made any modifications to the phone?

On my screen said charging rapidly, I put timer for 4 min to test the charging, while my phone at 17%. From my laptop it is 0% gain (still 17%) but f I plugin to my adapter charger it gains 6% (reach 23%). The thing different on screen between in charge from laptop and adapter are:
- from laptop said "charge rapidly"
-from adapter said "charge rapidly+ time reminding till fully charge".
I know USB c-c without PD is charging slow of compare to PD. But this is too slow!!

Megazia said:
On my screen said charging rapidly, I put timer for 4 min to test the charging, while my phone at 17%. From my laptop it is 0% gain (still 17%) but f I plugin to my adapter charger it gains 6% (reach 23%). The thing different on screen between in charge from laptop and adapter are:
- from laptop said "charge rapidly"
-from adapter said "charge rapidly+ time reminding till fully charge".
I know USB c-c without PD is charging slow of compare to PD. But this is too slow!!
Click to expand...
Click to collapse
i always thought that "charging rapidly" is shown if the gear used (cable, adapter, etc etc) supports the rapid charge (but may NOT deliver it)
kinda like the wireless charger, you can mod it to say "charging rapidly" on non google wireless stand but it still charges slowly.

Yes you are correct, I don't know if because of source or cable problem. Just like I mention above on the thread, my razer phone also come with PD and I use it with my laptop with no problem. But for Google pixel. It charged too slow even it shown as charging rapidly. Really hate to bring adapter around, coz I always working with my laptop, and I always charge my phone through it.

Megazia said:
Yes you are correct, I don't know if because of source or cable problem. Just like I mention above on the thread, my razer phone also come with PD and I use it with my laptop with no problem. But for Google pixel. It charged too slow even it shown as charging rapidly. Really hate to bring adapter around, coz I always working with my laptop, and I always charge my phone through it.
Click to expand...
Click to collapse
Virtyx makes a good point.
Looks more and more like the laptop is not providing the juice.

I do some varies test.. I am sure it is more firmware or software problem than hardware.. I don't know if it is bug or not.. here is the screenshot of my current rate flow between my razer phone and pixel XL 3 from laptop same source and same USB type C-C. I think it is similar problem with wireless charger which pixel only support quick charging from Google dock. Other dock it won't charge fast.
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Charging issue https://imgur.com/gallery/f7uYdO0