Database Users

USB Fast Charging?

Came from a TP2 and I could charge via USB at around 900 mA using fast charge driver.
Since I am a complete Android n00b, and an EVO n00b I have two questions.
1. Are there any apps out there that can show you how fast the battery is charging and discharging? I had one called Battery Monitor in WM, and I want an Android version of that.
2. It appears that USB charging is quite slow. Can anyone confirm the speed at which this phone charges via a USB port?
3. Is there a way to make this faster?
TIA!!

1. Are there any apps out there that can show you how fast the battery is charging and discharging? I had one called Battery Monitor in WM, and I want an Android version of that.
2. It appears that USB charging is quite slow. Can anyone confirm the speed at which this phone charges via a USB port?
3. Is there a way to make this faster?
A 1. I don't believe there is one (someone correct me if wrong), but there are apps to monitor your battery percentage.
A 2. Not sure, shouldn't be too long, how long is it taking yours?
A 3. I don't believe so.

Hero's Hero said:
1. Are there any apps out there that can show you how fast the battery is charging and discharging? I had one called Battery Monitor in WM, and I want an Android version of that.
2. It appears that USB charging is quite slow. Can anyone confirm the speed at which this phone charges via a USB port?
3. Is there a way to make this faster?
A 1. I don't believe there is one (someone correct me if wrong), but there are apps to monitor your battery percentage.
A 2. Not sure, shouldn't be too long, how long is it taking yours?
A 3. I don't believe so.
Click to expand...
Click to collapse
Thanks...Not sure how long it takes as I havent had the phone too long. I know while plugged into my computer last night it wouldn't charge very well.

Computers have much lower power than a wall socket. If you want to charge the EVO fast use the wall plug. Anyone who uses a Mac and the wired keyboard should know what I am talking about.

Please search before posting...
http://forum.xda-developers.com/showthread.php?t=591041

A USB port provides 500ma of power, you can get micro USB cable that will Y off and plug into two USB ports, providing 1000ma of power.

Grims said:
A USB port provides 500ma of power, you can get micro USB cable that will Y off and plug into two USB ports, providing 1000ma of power.
Click to expand...
Click to collapse
Every computer I owned charged my TP2 at around 800-900 mA as long as the fast charge driver was on the phone.
So I know for a fact that it's possible. It's limited by the phone, not the USB port. Appreciate the reply, but did you read Negrito's link?
And Negrito, I did search... This forum.... No hits. I see the link you provided was in the Hero forum. I didn't realize that the fast charge USB issue was affecting other Android phones as this is my first.

supdawg said:
And Negrito, I did search... This forum.... No hits. I see the link you provided was in the Hero forum. I didn't realize that the fast charge USB issue was affecting other Android phones as this is my first.
Click to expand...
Click to collapse
My bad broseph, totally forgot im still subscribed to Hero threads. I just switched to the Evo Launch day.
Its not really an issue per se as that's how all phones normally operate. On WinMo we just got spoiled my No2Chems hack. Anyone know if No2Chem made the jump to Android?
I have seen a lot of familiar names on the Evo forum, like OMJ, and Caulkin!!! I cant wait until someone comes up with an untethered root option and how to bypass the NAND cause I know the ROMs are just going to be simply amazing.

Was digging around in the custom menus, can't remember which one, but one of the ones that you type ##numbers# and enter your MSL and there was a check box for USB charging. Mine was unchecked for some reason. I left it alone but wonder if that makes a difference?

I've tested a few charging scenarios and can tell you that using a wall charger that outputs 1000 ma will help speed up the charge.
These from Monoprice work very well:
http://www.monoprice.com/products/product.asp?c_id=103&cp_id=10311&cs_id=1031106&p_id=6767&seq=1&format=2
want the same thing for the car?
try this one.
Here's the link to a micro usb cable at monoprice for $1.20.
There's a nice Rosewill 4 port charger, that will output 2000 ma IF you have only one device plugged in. With two devices plugged in, it falls back to 1000 ma (still really good). I have this in the kitchen for the kids to jack their various usb things in for charging.
The thing to remember is that the phone will pull as much as it can (most recent phones can pull between 750 and 1000 ma.) What will cause it to charge slower is not usually a software setting, it's having a port that will only put out 500 ma or less...which is what many computers output.
Sean

there is an option in settings /devolopment for usb charging doesnt ssy what it does though

I don't think mine has taken more than 4-5 hours to fully charge and signal strength isn't the greatest at my house so that probably has an impact on it as well... I've no idea if that's normal for a smartphone or if it's considered slow, I don't think my Sony Ericsson feature phone was any faster but the battery indicator on that thing was wildly inaccurate anyway.
My EVO seems to charge just as fast w/the included HTC adapter as with a generic Philips one I had, as well as one of those retractable cables. I was afraid that cable wouldn't be very well shielded and it wouldn't charge right but it seems fine, I'll only be using it when I travel anyway.

Negrito said:
My bad broseph, totally forgot im still subscribed to Hero threads. I just switched to the Evo Launch day.
Its not really an issue per se as that's how all phones normally operate. On WinMo we just got spoiled my No2Chems hack. Anyone know if No2Chem made the jump to Android?
Click to expand...
Click to collapse
No one has seen nor heard from No2Chem in months... Some people think he may have died

I could charge my Touch Pro 2 in about an hour or two using a standard usb plug on any computer I owned.
Might I add the Touch Pro 2 and the EVO share the same identical battery. The EVO obviously draws more current..... I found while using my EVO while plugged into a computer, it barely charges at all. My guess is its discharging while charging at a very similar rate.

Contrary to what most of you are saying, the ma rating of the charger really makes no difference as the phone (and prior htc phones) will pull <500ma if they detect they are plugged into a computer or non-official charger and 1a if they detect an htc charger (which can even damage 500ma chargers). The way this is detected is through grounding of one of the microusb pins in the official charger (and indeed many generic chargers but not all will be detected this way). Absent this grounding (I forget which pin), it will charge at a slower speed. I know of cheap 500ma chargers which have been caused to smoke by attaching a cable with that grounding fooling the phone into thinking it is an oem charger. Many chargers labeled 1a will charge at the 500ma rate as well.
Also, modern computers are fully capable of outputting 1a of power through the usb port. While the spec indeed is 500ma, with a proper cable (or the fastcharge driver for windows mobile), you can force a 1a power draw without any issues. Cheap usb hubs or cheap usb power ports may run into issues.
I'd love to see a solution for android but I don't think one exists.

Actually the HTC battery Widget will show you if you are on AC (1A) or USB (500ma) charge. You can get this widget from the market (not sure why it is not included in the phone in the first place).
I think that the grounding pin is likely the trick and I will be searching the web to see if I can locate it. I have an older battery pack from APC that can output 1.6A but the only way to get the EVO to charge as if it was on "AC" is to use the HTC plug, and then quickly, before the charge light goes out switch to my alternate source. This seems to trick the EVO into thinking that it is still plugged in to the official charger.
This is of course trickier with my car charger, which has been very frustrating - using the phone for navigation and plugged in via usb usually has the battery draining rather than charging!
I wish there was an easy way to fix this, my old phones always attempted to pull as much current as they needed.

My friend uses a 2A charger for his HTC touch pro 2, and it uses the same battery as the EVO if u guys didnt know.
i havent tried it on my evo, but being its from htc too (and uses the same battery)... id expect it to work with that much current.
I currently use a 900mA one in my car, and i do notice that if i use something less than that i tend to get feedback from the audio jack that connects to my cassette player

Found a discussion on this on the android forums relating to the HTC Desire:
<Too new of a user, system won't let me post the link>
I opened a car charger and shorted pins 2 and 3, and the phone did show charging over AC (2 and 3 are the data pins, 1 & 2 are power). My multimeter was acting up, so I am not sure whether the EVO is actually pulling more current - it does appear to be charging faster.
If you try this make sure of 2 things:
1. You charger is capable of 1A.
2. If you choose to short the pins on a USB cable make sure this cable never gets plugged in to your PC.

Rennat said:
Computers have much lower power than a wall socket. If you want to charge the EVO fast use the wall plug. Anyone who uses a Mac and the wired keyboard should know what I am talking about.
Click to expand...
Click to collapse
I know what you mean! Haha

supdawg said:
Came from a TP2 and I could charge via USB at around 900 mA using fast charge driver.
Since I am a complete Android n00b, and an EVO n00b I have two questions.
1. Are there any apps out there that can show you how fast the battery is charging and discharging? I had one called Battery Monitor in WM, and I want an Android version of that.
2. It appears that USB charging is quite slow. Can anyone confirm the speed at which this phone charges via a USB port?
3. Is there a way to make this faster?
TIA!!
Click to expand...
Click to collapse
For your Q #1 search the market for Battery Indicator, great simple app that gives you a battery percentage and how long you have been plugged in or unplugged.

Galaxy Tab charging issue + solution

Hey guys - I've been dealing with a Tab charging issue for a few days, and finally solved it... but I thought I'd post the problem and solution here in case it can save someone else a load of frustration if they run into the same problem.
From what I've read, we know that the Tab only draws .5A power from a USB socket, but that it draws ~2A from the wall, and that it knows the difference by testing for a short on the TX/RX USB data wires. (Correct me if I'm wrong on the details, but that's the general impression I've gotten.) We also know that the iPhone/iPad/iPod uses a pair of resistors instead (per the USB spec) to determine the current-delivery capability of the source. (I'm no EE, so I'm a little fuzzy on how that works from a technical perspective.)
So to set the stage: I had brought the USB cable for my Tab with me, but had neglected to grab the USB->outlet adapter for the mains. Similarly, a friend who was on vacation with us had forgotten the charging cable for his iPhone. Thinking I was killing two birds with one stone, I bought an aftermarket USB charging cable for the iPhone which had a separate USB->outlet adapter. His iPhone charged swimmingly, and when I charged my Tab overnight (screen off, starting at ~89% charge) using my cable and the aftermarket adapter, it worked flawlessly. No problem, great solution, or so it seemed...
...until I got home. Suddenly, my Tab wouldn't do more than a trickle charge - the same charge it gets when connected to the USB port on my laptop. (I could tell this was the case because of the small red 'x' next to the charging symbol in the battery icon - which I hadn't noticed while on vacation.) A 2.5-hour car trip using Navigator (screen on the whole time), even with the car charger connected, killed the battery completely. No matter what I did - shutting down apps, rebooting the device, resetting every option I could find - I could not get a fast charge to happen. Even leaving the device plugged in overnight resulted in *less* charge than what I started with if I didn't turn the screen off. I called T-mobile, talked to Samsung tech support twice... and all they could offer was to have me send the Tab back for replacement.
I was at a loss. I nearly did a hard reset in frustration, thinking I had screwed something up royally.
Then I saw the resistors in the pictures in this post:
http://forum.xda-developers.com/showthread.php?t=845844&page=3
and something clicked. I had been assuming that the *cables* were the difference between the iPhone and Tab chargers... but there isn't enough room for resistors in the cables! (Well technically, there is, but regardless...) The resistors must live somewhere else... and, I reasoned, that somewhere must be inside the USB->outlet adapter. So I pulled out the 'proper' Samsung adapter, plugged in the Tab, and voilà... a perfect fast charge.
So this is why the Tab won't charge with an iPod (or Sony-Ericsson, as it turns out) mains USB adapter OR USB-port car charger: the circuitry to let the device know it's capable of a full 2A delivery doesn't live in the Samsung cables; it's only present in the adapter. If that's not there, the device thinks it's connected via USB (and will, in fact, say "USB Connected" every time the charger is plugged in) and won't charge more than a trickle.
So that's my story, and hopefully it can save someone else some pain and frustration. Thanks for giving me the floor.

mattcelt said:
Hey guys - I've been dealing with a Tab charging issue for a few days, and finally solved it... but I thought I'd post the problem and solution here in case it can save someone else a load of frustration if they run into the same problem.
From what I've read, we know that the Tab only draws .5A power from a USB socket, but that it draws ~2A from the wall, and that it knows the difference by testing for a short on the TX/RX USB data wires. (Correct me if I'm wrong on the details, but that's the general impression I've gotten.) We also know that the iPhone/iPad/iPod uses a pair of resistors instead (per the USB spec) to determine the current-delivery capability of the source. (I'm no EE, so I'm a little fuzzy on how that works from a technical perspective.)
So to set the stage: I had brought the USB cable for my Tab with me, but had neglected to grab the USB->outlet adapter for the mains. Similarly, a friend who was on vacation with us had forgotten the charging cable for his iPhone. Thinking I was killing two birds with one stone, I bought an aftermarket USB charging cable for the iPhone which had a separate USB->outlet adapter. His iPhone charged swimmingly, and when I charged my Tab overnight (screen off, starting at ~89% charge) using my cable and the aftermarket adapter, it worked flawlessly. No problem, great solution, or so it seemed...
...until I got home. Suddenly, my Tab wouldn't do more than a trickle charge - the same charge it gets when connected to the USB port on my laptop. (I could tell this was the case because of the small red 'x' next to the charging symbol in the battery icon - which I hadn't noticed while on vacation.) A 2.5-hour car trip using Navigator (screen on the whole time), even with the car charger connected, killed the battery completely. No matter what I did - shutting down apps, rebooting the device, resetting every option I could find - I could not get a fast charge to happen. Even leaving the device plugged in overnight resulted in *less* charge than what I started with if I didn't turn the screen off. I called T-mobile, talked to Samsung tech support twice... and all they could offer was to have me send the Tab back for replacement.
I was at a loss. I nearly did a hard reset in frustration, thinking I had screwed something up royally.
Then I saw the resistors in the pictures in this post:
http://forum.xda-developers.com/showthread.php?t=845844&page=3
and something clicked. I had been assuming that the *cables* were the difference between the iPhone and Tab chargers... but there isn't enough room for resistors in the cables! (Well technically, there is, but regardless...) The resistors must live somewhere else... and, I reasoned, that somewhere must be inside the USB->outlet adapter. So I pulled out the 'proper' Samsung adapter, plugged in the Tab, and voilà... a perfect fast charge.
So this is why the Tab won't charge with an iPod (or Sony-Ericsson, as it turns out) mains USB adapter OR USB-port car charger: the circuitry to let the device know it's capable of a full 2A delivery doesn't live in the Samsung cables; it's only present in the adapter. If that's not there, the device thinks it's connected via USB (and will, in fact, say "USB Connected" every time the charger is plugged in) and won't charge more than a trickle.
So that's my story, and hopefully it can save someone else some pain and frustration. Thanks for giving me the floor.
Click to expand...
Click to collapse
I've recently seen (somewhere) a usb pigtail cable that shorts the pins to make the tab (or any other usb chargable phone) think it's hooked up to a wall charger, rather than a trickle charging usb port.... I need to find that again and just order a few to have in my various cable bags.

If you do find it again, please post it here. Definitely something I'd like in my bag of tricks as well.

Just as an FYI, the 2A charger that came with my Nook Color charges the Tab just fine from mains, even indicates charging. Makes sense, since both devices have a 4000mAH battery.
It's also a nicer unit for travel, it's nicely rounded, the prongs fold into the body of the charger, and you can pick it up from Barnes and Nobles stores just about anywhere in the US. Still doesn't solve the Tab cable issue though.

Croak said:
Still doesn't solve the Tab cable issue though.
Click to expand...
Click to collapse
I'm planning on hacking apart a spare Tab cable so that it goes to a female microUSB; no more multiple cable types then. The stock Tab cable doesn't appear to have more than 6 pins, of which I'm sure a few are grounds.

Someone recently posted a link to the first cheap 3rd-party cables:
http://www.dealextreme.com/details.dx/sku.51931
Get those with a 6' USB extension cable and the Nook charger, and that may be a winning combination. I ordered four the the charging cables yesterday, and I'll try to remember to post whether or not they work out well.

Resonance, what are you planning on using for a car charger, if any? I really like the Navigator app, but it's just not practical if I can't keep the Tab charged while using it.
Does anyone know if there are any USB->12v adapters that have the right circuitry for the Samsung? For that matter, do any other devices use the same amperage detection setup the Tab does? It would be good to know what components are cross-compatible.

Thanks for the info.
How about a list of chargers that work fine on the GTab.
1. Garminfone charger (1amp - works great and I use it as my primary charger)

mattcelt said:
Resonance, what are you planning on using for a car charger, if any? I really like the Navigator app, but it's just not practical if I can't keep the Tab charged while using it.
Click to expand...
Click to collapse
A 12V inverter, attached to the standard wall charger. :/
I bought the Duragadget 12V->USB charger, since it was advertised specifically as a 2A charger for the Galaxy Tab, but it DOES NOT work as advertised (the Tab treats it like a any other low-current USB port, and even offers to mount mass storage, heh).
Using the inverter and the wall charger worked just fine, though it was a bit clunky and unstable (on mine, the prongs aren't tightly gripped, so it bends out of place easily).
Does anyone know if there are any USB->12v adapters that have the right circuitry for the Samsung? For that matter, do any other devices use the same amperage detection setup the Tab does? It would be good to know what components are cross-compatible.
Click to expand...
Click to collapse
I'd been contemplating giving the Duragadget charger with integrated cable a try, but having been burned once by Duragadget, I'm a bit hesitant to do so.

ResonanceZero said:
Someone recently posted a link to the first cheap 3rd-party cables:
http://www.dealextreme.com/details.dx/sku.51931
Get those with a 6' USB extension cable and the Nook charger, and that may be a winning combination. I ordered four the the charging cables yesterday, and I'll try to remember to post whether or not they work out well.
Click to expand...
Click to collapse
OMG...I bought a charger cable from amazon SOLD BY AMAZON marketed as OEM samsung charger and I got the same one in the deal extreme page. WTF...paid $12 for it too.

ResonanceZero said:
A 12V inverter, attached to the standard wall charger. :/
I bought the Duragadget 12V->USB charger, since it was advertised specifically as a 2A charger for the Galaxy Tab, but it DOES NOT work as advertised (the Tab treats it like a any other low-current USB port, and even offers to mount mass storage, heh).
Using the inverter and the wall charger worked just fine, though it was a bit clunky and unstable (on mine, the prongs aren't tightly gripped, so it bends out of place easily).
I'd been contemplating giving the Duragadget charger with integrated cable a try, but having been burned once by Duragadget, I'm a bit hesitant to do so.
Click to expand...
Click to collapse
looks like that car charger is the same as the one you bought with a USB cable included.

nacron said:
looks like that car charger is the same as the one you bought with a USB cable included.
Click to expand...
Click to collapse
Good eyes. I thought it was a different unit with an integrated cable.
Has anyone found a functioning 12v charger?

yes, the verizon store has a 12v charger for the galaxy tab, but that was the only place I was able to find one... other than online.

Hi,
Can anyone else confirm that the Nook charger works for the Tab?
I've tried other high current (2.0+ amp) chargers. Some designed for the ipad and some not, and I always get the trickle charge icon and it's treated as a computer USB connection (Mass storage device options, etc).
How much was the Verizon charger?
Thanks!

stock wall charger works for me.

knowthenazz said:
Hi,
Can anyone else confirm that the Nook charger works for the Tab?
I've tried other high current (2.0+ amp) chargers. Some designed for the ipad and some not, and I always get the trickle charge icon and it's treated as a computer USB connection (Mass storage device options, etc).
How much was the Verizon charger?
Thanks!
Click to expand...
Click to collapse
Google the gobatt 2 charger. It comes with a usb adapter that charges the tab on any charger.

texasreb said:
Google the gobatt 2 charger. It comes with a usb adapter that charges the tab on any charger.
Click to expand...
Click to collapse
Hi,
Thanks for the tip. I can't find much information about the Scosche GoBatt 2 charger, or the adapter that comes with it. Today I tried other Scosche chargers, including their iPad charger, and it didn't seem to work.
Can you give some more details on the adapter that comes with the GoBatt 2?
Thanks!

Got this travel adapter by ZipKord with 2 - 1 amp outlets. Works with the OEM cord and also the Gomadic tip made for the Galaxy Tab. Just need to be careful it's not the older version that only has the lower power outlets. Cheapest I could find was $13+, so if it's less, it's the lower power. With the Gomadic tip and reractable cord, it says it's charging.
EVO 4G 9292 - Travel Adapter By ZipKord
Also this Scosche battery pack seems like it would work. Has 2 - 1 amp USB ports. I ordered one and should get it tomorrow.
Scosche IPDBAT2 Portable Back Up Battery for iPad and iPod
Oops - can't do links. Just search in Amazon. It's where I got both.
Gomadic cord and tips from Gomadic. Love losing the excess clutter (cords).

galaxy tab 7 charging while turned on
can someone explain well how to build the adaptor for charge galaxy tab 7 while it turned on?
is it possible to have a scheme with picture and some photos which describe the work to do?
thanks. and excuse me for bad english.
mattcelt said:
Hey guys - I've been dealing with a Tab charging issue for a few days, and finally solved it... but I thought I'd post the problem and solution here in case it can save someone else a load of frustration if they run into the same problem.
From what I've read, we know that the Tab only draws .5A power from a USB socket, but that it draws ~2A from the wall, and that it knows the difference by testing for a short on the TX/RX USB data wires. (Correct me if I'm wrong on the details, but that's the general impression I've gotten.) We also know that the iPhone/iPad/iPod uses a pair of resistors instead (per the USB spec) to determine the current-delivery capability of the source. (I'm no EE, so I'm a little fuzzy on how that works from a technical perspective.)
So to set the stage: I had brought the USB cable for my Tab with me, but had neglected to grab the USB->outlet adapter for the mains. Similarly, a friend who was on vacation with us had forgotten the charging cable for his iPhone. Thinking I was killing two birds with one stone, I bought an aftermarket USB charging cable for the iPhone which had a separate USB->outlet adapter. His iPhone charged swimmingly, and when I charged my Tab overnight (screen off, starting at ~89% charge) using my cable and the aftermarket adapter, it worked flawlessly. No problem, great solution, or so it seemed...
...until I got home. Suddenly, my Tab wouldn't do more than a trickle charge - the same charge it gets when connected to the USB port on my laptop. (I could tell this was the case because of the small red 'x' next to the charging symbol in the battery icon - which I hadn't noticed while on vacation.) A 2.5-hour car trip using Navigator (screen on the whole time), even with the car charger connected, killed the battery completely. No matter what I did - shutting down apps, rebooting the device, resetting every option I could find - I could not get a fast charge to happen. Even leaving the device plugged in overnight resulted in *less* charge than what I started with if I didn't turn the screen off. I called T-mobile, talked to Samsung tech support twice... and all they could offer was to have me send the Tab back for replacement.
I was at a loss. I nearly did a hard reset in frustration, thinking I had screwed something up royally.
Then I saw the resistors in the pictures in this post:
http://forum.xda-developers.com/showthread.php?t=845844&page=3
and something clicked. I had been assuming that the *cables* were the difference between the iPhone and Tab chargers... but there isn't enough room for resistors in the cables! (Well technically, there is, but regardless...) The resistors must live somewhere else... and, I reasoned, that somewhere must be inside the USB->outlet adapter. So I pulled out the 'proper' Samsung adapter, plugged in the Tab, and voilà... a perfect fast charge.
So this is why the Tab won't charge with an iPod (or Sony-Ericsson, as it turns out) mains USB adapter OR USB-port car charger: the circuitry to let the device know it's capable of a full 2A delivery doesn't live in the Samsung cables; it's only present in the adapter. If that's not there, the device thinks it's connected via USB (and will, in fact, say "USB Connected" every time the charger is plugged in) and won't charge more than a trickle.
So that's my story, and hopefully it can save someone else some pain and frustration. Thanks for giving me the floor.
Click to expand...
Click to collapse

potential solution
found this on youtube, looks like it has great potential:
forum won't let me post url links, but this is the video code in you tube. We're all geeks here (I think) so you know where this goes :
=uPc-ZA3t5aY
hope it helps!

slow / laggy when charging S2

have anyone got issues with S2 when plugged into power?
ie when I start recharging direct from 240V adapter, my S2 started getting VERY laggy and slow.
It immediately goes back to normal response when I unplug power.

I have never problem like you

mtrax said:
have anyone got issues with S2 when plugged into power?
ie when I start recharging direct from 240V adapter, my S2 started getting VERY laggy and slow.
It immediately goes back to normal response when I unplug power.
Click to expand...
Click to collapse
Try using an alternative charger...probably your mains charger or the usb connector on the charger is damaged.

I'm pretty sure its a issue with the s/w as I have used the charger on another phone without any issue.
unless its one of the apps I'm using, not sure how to narrow it down.

mtrax...
I have the same issue.
You´re not alone...LOL

FYI the common issue I have when plugged in is that its not easy to unlock screen, takes me a 2-3 swipes to unlock screen and after that it seems that it ignores every other key press..
Any one reported this to Samsung? I will try to log a ticket to see what happens.

Try do a multi touch test while its plugged in see if the screens acting funny.

how do I do a multi-touch test?
what will that prove? as the screen works fine when unplugged.

I have the same issue but only when charging with the usb lead (with usb power adapter) instead of the standard mains charger. Think it might have stopped now that debugging is enabled and the Samsung kies screen doesn't come up when i connect the usb.
Sent from my GT-I9100 using XDA App

Took my phone 2 hours to charge from 36 % to 100 %

note this issue doesn't occur when charging via PC ONLY via 240V mains, but let me try with USB debugging on.
edit tried USB debbuging still has issue.
Note is the 240V USB cable different from a normal USB cable? ie perhaps the device thinks its a PC connection

the phone is laggy because of the electrical interference from a faulty charger or some other electrical equipment in the near vicinity...
Please note that actually the capacitive touchscreen becomes laggy not the applications/services...
keep it away from the electrical interference...use the samsung original charger..gud quality USB cable....and the issue will be gone... for sure

looks like its the charger, the A/C adapter I got with the phone was UK which is why I didn't use it to begin with, but tried the samsung one with a UK/AU adapter and its fine..
hmm who would have thought that was the issue...
interesting it didn't affect my other HTC phone.

Same issue here, but something special:
I ebayed another charger for my sgs2, original samsung one. Same serial number, same description, same style.. but i got the charging problem only with the new one.
With my original charger (the one, which was delivered with the phone) works fine. No slow and no lag.
The new one was about 5 euro, seems to be an original...

to demonstrate my point that its the electrical interference from the dodgy chargers onto the capacitive touchscreen... do this and report back...
plug the faulty charger onto the socket BUT DO NOT charge the phone with it...
keep the phone near to the charger wires etc....(not in charge)... you will see the screen lagging sometimes unresponsive...
now move the phone away ...it will work fine..
you can keep on using the dodgy chargers for charging...but use the phone only after it has been charged and is away from the charger...

woodstock_ahem said:
to demonstrate my point that its the electrical interference from the dodgy chargers onto the capacitive touchscreen... do this and report back...
plug the faulty charger onto the socket BUT DO NOT charge the phone with it...
keep the phone near to the charger wires etc....(not in charge)... you will see the screen lagging sometimes unresponsive...
now move the phone away ...it will work fine..
you can keep on using the dodgy chargers for charging...but use the phone only after it has been charged and is away from the charger...
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Click to collapse
I am not able to reproduce that with my original charger. There is no lag or any other problem. Switching to my second "original" (ebay 5 €uro) samsung charger leads me direct to the lag and your description. First i thought my second one is not an original one, but because of your description there seems to be a diffrent quality on the original charger depending on it production date.. unit.. charge.. or whatever.

I bought a sgs2 from the UK, and have a UK to AUS converter on the stock charger and I have no lag when it's charging or near chargers.

Sorry. Not a problem here. Writing now and plugged. Very responsive.
Sent from my GT-I9100 using XDA Premium App

The electrical interference with the capacitive display is bullcrap since it needs electrical properties to respond. So it depends on whether your body has enough electrical properties.
So back to the point:
It is due to CPU reducing the clock speeds to prevent the phone from overheating as the battery itself produces enough heat anyway.
Many other people may not notice it since they may not perform intensive tasks while the phone is plugged in and the variation itself is also almost unnoticeable.
I have the same issue but as I said, it's almost unnoticeable to even bring it up in this forum. I haven't done any testing myself to prove this, but the same safety feature is implemented in most modern phones.

I have the same issue - I also had this issue with my Atrix.

Xperia play charger

Hi i just got my xperia play and noticed that it is almost unusable when im charging, the keyboard will hit random keys i cant scroll from the main screen etc. But as soon as i pull the charger usb out it functions perfectly, anyone know whats up?

I've noticed something similar, the accuracy isn't as good when the charger is plugged it. Are you using it with the pad out or not? try with the pad out and see if that helps, otherwise it may be a hardware fault

I use it while it is charging all the time. It works perfectly.
Sent from my XPlay using XDA App.

I haven’t had any problems using mine while plugged in.

This is not that uncommon as one would think really. Capacitive touch screens may react different and most of all less accurate when plugged in to a charger. Try using a different wall socket when charging and you'll probably notice some difference to this behaviour.
A grounded wall socket is usually better than a non-grounded one.
-Markus
Sony Ericsson Answers Team

i had that in my iphone your charger give the device to much voltege and its creeping up switch to a diffrent charger and a cable and see if thats help (and it will)

Impossible to charge sg2 in car

Hi all, just came 3 days ago from an htc hd2, and so far I am more than happy with it.
I have only one complaint and maybe you guys will help me sharing your experience : I can't charge this phone in my car while using gps.
It seems that the power adapter is not powerful enough to charge the phone screen on.
The car charger has a 5v 1000ma output, more than the regular wall charger provided by Samsung and it was working well before with my HD2 so I have no clue about this problem.
Did you experience that issue too, else can you share what car charger do you use?

try to buy new standard car charger with micro plug.. 13 eur and you will be saved..
Sent from my GT-I9100 using XDA App

Charger doesn't matter unless the phone is dropping into USB charging mode - phone limits to around 600-650 mA by default.
Custom kernels can bump this limit up for I9100 users. I777 users are screwed - we've got a crippled charger chip.

I had the same problem, I used the samsung one, useless, so I used my iPad charger, which is 2A, and charges the iPad quick, still useless. We drove from Bathurst NSW, down to Melbourne, about 10 hour drive, plugged in all the way using GPS, and about an hour from home, the connect to charger warning came on!! So once I stopped GPS, it started taking charge. Looks like when the phone is in use, it draws more then it takes charge, plus I read somewhere on here the phone is limited on the charge it takes, so using the 2A does nothing different then the stock 500mA charger.

I always had this problem with my Nexus One, although they are different phones, the problem is the same, uses more power then it can recharge in USB mode.
After trying 3 or 4 different charges I remember that I found one ultra-cheap 'made in taiwan' from a street seller that worked very well.... so it's kind of a lucky shot!
good luck!

Im using a genuine Samsung SGS2 charger and I can charge and run Sygic just fine. I started my journey with 80% and 40mins later I was up to 91% when I stopped and got out. (not in aeroplane mode..)

Very interesting feedbacks... So that confirm that is clearly not a matter of output amperage power.
It is now the same problem on the galaxy tab 10.1, for quickly charge this tab you need the Samsung compatible usb adapter.
It can be likely with a tab bringing a proprietary plug, but I didn't thought it will be the same with a Samsung phone bringing a regular micro usb plug. Quite frustrating and disappointing!
I will search around a micro plug car charger as suggested by redzion, but actually I don't clearly see the difference with my usb charger + a micro usb cable.

Double post, sorry.

If I use the usb cable from my cd player I have the same problem but if I use the official Samsung car charger Ithe only problem I have is the phone getting stupid hot
Sent from my GT-I9100 using xda premium

Oh Samsung, when you will understand?!

Samsung DOES follow the USB charging standard - it goes to its highest current setting when a charger that follows the standard is connected.
Note that iPad/iPhone chargers do NOT follow the standard - Samsungs will treat these as USB hosts and limit to 450 mA instead of 600-650.
Modified kernels can increase both of these values on I9100s.
The only thing Samsung really did **** up is counting screen/CPU current usage against the charge current limits - that's just stupid.

So the charger has smarts. On the i9000 factory chargers, the data pins were bridged. Bridging these pins manually on a USB cable when connecting to a USB source (such as a PC) enabled full current charging. You can see this in Settings -> About; it will say either USB or AC charging.
Do you think this is the case with the i9100?
I don't condone testing this theory on your i9100. Increasing the max current via custom ROM may be a safer solution.

I had the same problem. Two things fixed it for me:
1) I bought this charger: Sony Ericsson AN300 Micro USB 10€
2) I am using a custom kernel now

Any charger that is rated at 1000mA or more (per port) will do just fine. The problem is the cable - you need a quality microUSB cable, or it won't provide all the juice you need. I had the same issue, and I swapped three chargers until I found the real culprit.
Try with the charger you have now and the mUSB cable that was in the phone box - it should work well with that one.

I just press the power button to turn the screen off. when i need the sat nav i press the power and it still tracks you so there is no delay. With the screen off it does charge.

same problem

Duffman19 said:
I just press the power button to turn the screen off. when i need the sat nav i press the power and it still tracks you so there is no delay. With the screen off it does charge.
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Click to collapse
You are right, but even if it is better than nothing the charging time is still a big problem.
Yesterday I drove for at least 40mn phone off. Arrived to destination, I turn the device on: it charged only from 0 to 5%
I would like to test the mariusi theory concerning the Samsung micro usb cable, unfortunately on my SgsII box I just have a wall charger, no a microusb-usb cable.
Entropy512 said:
Samsung DOES follow the USB charging standard - it goes to its highest current setting when a charger that follows the standard is connected.
Click to expand...
Click to collapse
Is there a way to know before buying if the charger respect this charging standard?
I have some cheap usb chargers here and no one is a fast as the one provided by Samsung.
Entropy512 said:
The only thing Samsung really did **** up is counting screen/CPU current usage against the charge current limits - that's just stupid.
Click to expand...
Click to collapse
Maybe for safety purpose? Gps phones can become very hot behind the car glass.

Samsung are trying to "encourage" you to buy only their official accessories. To do this they've wired something differently in their chargers and cables. This "problem" exists on the Galaxy Tab too and can be solved with this adapter...
http://www.ebay.co.uk/itm/USB-car-w...ccessories&hash=item2c5c07736b#ht_3084wt_1163
It's cheap and turns a trickle charge into a full charge. I don't know the specifics of what they've done, but their USB charging just isn't the same as most others manufacturers.

Archer said:
It's cheap and turns a trickle charge into a full charge. I don't know the specifics of what they've done, but their USB charging just isn't the same as most others manufacturers.
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Click to collapse
Great find.

Pretty sure it just bridges the data pins.