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Hi All,
Was wondering if anyone knows the maximum current the SGS2 can draw for charging purposes. I had a look at the wall charger provided with it, and it's 0.7a; it takes forever (my opinion) to charge compared to my last phone. Just wondering if it is worth my while investing in a more powerful charger.
Cheers
If you take the battery out and look and the sticker then it says there 1000mA
Excellent thanks; Can't get the back off my phone (fingernails).
oozrafa said:
If you take the battery out and look and the sticker then it says there 1000mA
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Also, at the start of the SGS2 charging cycle, my wall-plug power meter reads 5.1 W.
5.1 is what the adapter is pulling. All of that isn't getting to the phone. Funny thing for my is the phone charges faster off my blackberry 0.75a charger then it does off my Galaxy I 1a charger.
Sent from my GT-I9100 using XDA Premium App
Someone in another thread mentioned seeing something in the source code about the phone drawing at most 650 mA (instead of a more typical 1000 mA) during charging. If that's the case, a more powerful charger by itself won't help; you'd also need a custom ROM that doesn't limit the charge current.
Does anyone know why Samsung would limit the charge current?
theinstagator said:
Does anyone know why Samsung would limit the charge current?
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Speculation is that its a heat related problem. Don't want to pull a Sony and have the batteries explode on people... (but again, that's speculation)
Murfle said:
Speculation is that its a heat related problem. Don't want to pull a Sony and have the batteries explode on people... (but again, that's speculation)
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I also heard that a smaller charging current extends the Li-ion battery's lifetime, even though I'd prefer quicker charging as the battery can be replaced with ease.
I second that. I tried it today with a 1A car charger (USB cig. plug) can't say it made a difference on speed of charge compared to wall one.
Just received my SGSII and the charging is extremely slow. 3+ hours = about 500 mAh, on a 1A wall charger. Never had such a slow charging smartphone before
To change i9100 charging current you have to short r529 or r531
Current limit will change to 1000mA
You can use 2A charger and phone will charge only with 650mA current
But after this short one of those resistors current limit will change to 1A
I use it on my phone and all is fine. Current after change is measured.
Wath this film youtube.com/watch?v=FL71G2YEIHU
Make shortcut of resistor and check your new current and feel the difference.
Is there a logfile, where I can see which charge current is used?
I have the suspicion, that my noname charger is not recognized properly and it only charges with USB current (450mA).
hmm a 1000mA current could be used also for the 2000mAh battery?
Yes, should not depend on the capacity of the battery.
Sent from my GT-I9100 using xda app-developers app
good
thank for all, it help me so much
1000mA is more likely the maximum current that the phone is expected to drain from the battery.
It is not the battery charging current, which is presumably equal to the mentioned 650mA, since the 1650mAh battery charges in about 4 hours.
If the charging current was actually 1000mA, then the 1650mA battery it would charge in 2 hours or so, but as we all know, it is not so, even with a 2A charger.
mine took about 4 hours charge the battery
The charging time depends on the Charger and Rom i use, i havent figured out for what reason.
Sometimes the SGS2 is charged in approx. 1 hour and with other Roms the charging time may take up to 3h.
kirschi said:
The charging time depends on the Charger and Rom i use, i havent figured out for what reason.
Sometimes the SGS2 is charged in approx. 1 hour and with other Roms the charging time may take up to 3h.
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Definately 650ma, IF the phone detects an High current USB port, otherwise it falls back to lousy 400ma.
You can trick into 650ma always: take a usb cable, cut from the PC plug side the TX/RX cables, on the other side short them on PHONE plug side these two cables.
Phone will now always go into "AC charging mode". Don't worry (too much) for your USB ports, they can all well 1000ma, and the one that cannot will report "high current detected, port disable".
:fingers-crossed:
I see that the wall charger for the Galaxy Nexus outputs 5V and 1A. Unfortunately, none of the extra chargers I'd like to use as additional chargers have this output. Some of them are 5.1V, and some of them all put out under 1A.
From what I understand, using a charger w/ a higher voltage could potentially damage the phone. I know that this unlikely considering it's only an extra .1V in my case, but I don't want to risk it.
As for the amps, I believe that using lower amps isn't dangerous, but may result in charging taking longer than normal.
Are these two assumptions correct? Also, does anyone know of any cheap chargers that put out 5V/1A? If you put in "phone charger" in Amazon, the second hit is a Samsung OEM charger that puts out 5V/0.7A, but I'd rather get one that is going to be an exact match.
700-800mah are fine and acceptable for charging. But if wanting to play games on a charger and still get some kind of charge, go with a 1000 mah charger. 1000 mah charger is also best to use while using mhl so you can hopefully not lose battery charge while streaming video over hdmi.
Sent from my samsung gt i9250 which is in the wrong country.
Speaking of the charger... anyone found a cheap charger adapter for the Nexus? I don't like the massive brick of a "international adapter" Handtec packaged with the phone >.>
Dmw017 said:
Speaking of the charger... anyone found a cheap charger adapter for the Nexus? I don't like the massive brick of a "international adapter" Handtec packaged with the phone >.>
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http://www.amazon.com/Samsung-Micro-Travel-Charger-M540/dp/B002HJBM04
http://www.amazon.com/Samsung-Travel-Charger-Adapter-MicroUSB/dp/B0049IE70I
Dmw017 said:
Speaking of the charger... anyone found a cheap charger adapter for the Nexus? I don't like the massive brick of a "international adapter" Handtec packaged with the phone >.>
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I'm using a Griffin charger for the iPhone (1 amp)... it's very small and the plug blades fold up, making it very pocketable. Give the included iPhone cable to a friend.
http://www.amazon.com/Griffin-NA231...?s=electronics&ie=UTF8&qid=1322795627&sr=1-33
alee said:
I'm using a Griffin charger for the iPhone (1 amp)... it's very small and the plug blades fold up, making it very pocketable. Give the included iPhone cable to a friend.
http://www.amazon.com/Griffin-NA231...?s=electronics&ie=UTF8&qid=1322795627&sr=1-33
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it's.. 24 bucks ... for a charger..
lol fml
Dmw017 said:
it's.. 24 bucks ... for a charger..
lol fml
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Haha, it's a nice charger.
If you don't get that one, do get a charger that does at least 700mA... or ideally 1A. Some of the cheaper chargers don't put out a lot of power and it will take a long time to charge your phone.
alee said:
Haha, it's a nice charger.
If you don't get that one, do get a charger that does at least 700mA... or ideally 1A. Some of the cheaper chargers don't put out a lot of power and it will take a long time to charge your phone.
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...you say it folds too huh :/ ....
but for that price, i wonder if there are any samsung chargers that are just as good if not better..
that is Apple, after all
hey isnt http://www.amazon.com/Griffin-Techn...al-USB-Charging/dp/B004EYH5WY/ref=pd_sim_e_10 the same product , it says it does 5 volts at 5 watts ... thats the same right?
edit: some people are reporting that the charger only charges at 0.5A instead of the full 1A on [some] android devices. if you have the charger, can you confirm your nexus charges at the full 1A watts
I've been doing fine with just plugging it into my computer like I always do with every other phone.
Sent from my Galaxy Nexus using xda premium
Dmw017 said:
hey isnt http://www.amazon.com/Griffin-Techn...al-USB-Charging/dp/B004EYH5WY/ref=pd_sim_e_10 the same product , it says it does 5 volts at 5 watts ... thats the same right?
edit: some people are reporting that the charger only charges at 0.5A instead of the full 1A on [some] android devices. if you have the charger, can you confirm your nexus charges at the full 1A watts
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Same one.
Good question on whether it's putting out a full 1A. I guess what I do is check the charge times tomorrow with a few different 1A chargers to see if it measures up.
I use this for home:
http://www.amazon.com/Cellet-Charger-Retractable-Cable-myTouch/dp/B004XVM1T0
And this for the car:
http://www.amazon.com/Griffin-Powerjolt-Dual-Universal-Micro/dp/B0042B9U8Q
Both are dual-USB and put out 1amp. Charges my GNEX and iPhone 4 (work) at the same time without issues.
Just feel like to chime in here for another question.
I know typical USB port from a PC outputs 0.5A while the wall charger outputs 1A, so besides charging time, is there any particular advantages to use wall charger over USB from PC?
I've read somewhere else states that despite the longer charging time using a USB port from a PC, it provides more thorough charges hence is better for the battery than using a wall charger, is this true?
Thanks!
assisterah said:
Just feel like to chime in here for another question.
I know typical USB port from a PC outputs 0.5A while the wall charger outputs 1A, so besides charging time, is there any particular advantages to use wall charger over USB from PC?
I've read somewhere else states that despite the longer charging time using a USB port from a PC, it provides more thorough charges hence is better for the battery than using a wall charger, is this true?
Thanks!
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I've read that the wall charger drops the battery down to 90ish % after it hits 100% and just goes between the two levels until you unplug your charger
While a USB charge is slower and charges your device up to a "fuller" charge
...I may be unfathomably wrong though
---------- Post added at 10:57 PM ---------- Previous post was at 10:56 PM ----------
man that little Apple charger is so damn cute ... lol , ill probably end up buying it once the 1A volt charge is confirmed
edit: just bought it lol, oh well.. it will probably maybe more or less somewhat possibly work like it should at 1A :}
assisterah said:
Just feel like to chime in here for another question.
I know typical USB port from a PC outputs 0.5A while the wall charger outputs 1A, so besides charging time, is there any particular advantages to use wall charger over USB from PC?
I've read somewhere else states that despite the longer charging time using a USB port from a PC, it provides more thorough charges hence is better for the battery than using a wall charger, is this true?
Thanks!
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I'm not an expert on the subject but I was under the impression that cycles (charge + discharge) were a bigger factor on battery life than something like this. The longer a current is running through the battery (charge or discharge) is detrimental to it's life span.
Leaving a laptop plugged in all the time ruins its battery is my source on this one. I would say it's because it has a constant charge running through the battery.
qreffie said:
I've been doing fine with just plugging it into my computer like I always do with every other phone.
Sent from my Galaxy Nexus using xda premium
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That takes a lot longer vs plugging it into the wall
rashad1 said:
That takes a lot longer vs plugging it into the wall
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True dat. Unless it has changed , USB only outputs 500mA.
Sent from my Galaxy Nexus using Tapatalk
[hfm] said:
True dat. Unless it has changed , USB only outputs 500mA.
Sent from my Galaxy Nexus using Tapatalk
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500mA is the max before the PC will disable the port. So your actually get less current.
There are some ports, depending on the motherboard that have a option of outputting more power for charging devices, and also have the port powered when the computer is off. But a normal usb 2.0 port is limited to 500mA max per spec... so a normal usb 2.0 port charging a phone is drawing less then 500mA, or it would get and over current condition and disable the port.
I design electronics and work with USB and batteries often, so let me clear some stuff up in no particular order:
- PC ports are limited to 500mA so will only ever output a max of 500mA
- You can use a wall charger that outputs 1000mA but on most devices the data pins on the micro USB need to be shorted to tell the phone it can try to draw more than 500mA. This is true for HTC devices for example. That means if you get a cheap charger that doesn't short the data pins, when you plug your standard micro-usb cable into it, it will still only charge your phone at 500mA.
- The charging controller is actually in the phone. It decides based on temperature (there's a sensor in the battery), current, voltage across the battery (current charge) and characteristics of the type of battery to figure out how much current to allow into the battery. Although its true that a 500mA charger may have different affects than 1000mA chargers, there usually is very little perceivable difference. Which is (slightly) better really depends on the charging controller and how it decides when to stop charging.
- When the battery is full, the phone continues to 'trickle charge' for a period of time. This isn't a bad thing. Overcharging a Lithium battery can be extremely dangerous, so normal charging occurs at a high speed and then slows down at a safe limit below the 'true' 100%. After that the phone continues to trickle charge to top up the battery. This is the reason you read in phone manuals you should charge the phone for 8 hours or overnight for its first charge.
- When charging at 500mA, the battery does not get as hot. This usually means you get closer to the true 100% before 'trickle charging' starts. With a 1000mA charge the battery heats up a lot more so charging may switch to trickle much sooner. Here's an example with made up figures.
Lets say you charge your battery with a 500mA charger, and it takes 2 hours. When the phone shows 100% it may actually be at 99%, and trickle charging. Leaving it for another 30 mins may take it to its full capacity.
Now, lets say you charge your battery with a 1000mA charger, and it takes 1 hour. When the phone shows 100% it may actually be at 98%, and trickle charging - It stopped sooner because the battery was hotter. Leaving it for another 30 mins may take it to full capacity.
Conclusion.. the 500mA charger took 2.5 hours, while the 1000mA charger took 1.5 hours. However if you unplugged both when the phone showed 100%, the 500mA charged battery may last longer, and so you think the 500mA somehow resulted in a more thorough charge!
At the end of the day, it doesn't matter which you use. the absolute charge cycles is what counts. Charge to 100%, then dont charge till its 0 for best battery care. Constantly plugging into a charger or dock all day on and off is bad. But having said that, your phone is there to be used, so a sensible balance of the two is the best bet.
Thank you so much for the detailed response, kam187. Would you recommend avoiding using a 5.1V charger, considering the phone came with a 5V charger?
Sent from my Galaxy Nexus using Tapatalk
I wouldn't use it. The 0.1v probably won't make any difference, but it may not be regulated. Chargers with these odd values sometimes don't have any regulator inside them. That could damage your phone as the voltage could shoot up and down as the current draw changes.
Just search amazon/ebay for any MicroUSB charger, and pick one from a reputable manufacturer like Motorola, HTC, Samsung etc. Since all phones now use MicroUSB, there's loads of these chargers around from previous phone models etc.
Here's just one I saw on amazon.com:
http://www.amazon.com/Samsung-Trave...E70I/ref=sr_1_3?ie=UTF8&qid=1322808220&sr=8-3
My S3 came with a 1Ah charger. My Fascinate came with a 700mAh charger. Is it safe to charge my S3 on a 2Ah charger?
Thanks!
Yes. The charging rate is actually limited by the phone so the battery will not be damaged.
I use 2.1 amp chargers at home and in my car. I don't think I have ever seen a charge rate faster than 1.3 amps. It is slightly faster than the stock charger, so at least that's something.
It won't make any difference at all. That's a very common misconception about charger amperage (amp, for short) ratings:
The charger is rated to provide "up to" a certain amperage (current), but doesn't push that amperage to the phone. Rather, the phone draws however much amperage it wants. A problem can exist if the phone pulls more amperage than the charger is rated to supply. (For example, pulling 1 amp from a netbook USB port can burn out the USB port.)
This is why the phone kernel, by default, only pulls <500 milliamps from an unrecognized charger... That's a "safe" amount for pretty much anything USB.
Chances are that the phone will only pull 450 to 500 milliamps from your 2 amp (2000 milliamp) charger unless you are using a custom kernel that pushes it higher (and then I don't think the charging circuitry in the in phone will ever pull more than 950 milliamps.)
Take care
Gary
i calcualted that my 2.1 car charger charges my phone 1% every two mins versus my stock charger at home that charges 1% every four mins so technically twiuce as fast
That's why it's recommended that you only use the charger that came with your phone. I know that's not always possible, but that's what's said.
Hi, my phone Note 2 baseband/ firmware is N7100UBALI9, but came with power AC charger USA prong(flat) with output 2 Ampere. All knowledge of electronics, I'm just wondering from a professional user (xda devs) is it safe using/charging regular charger output 0.5A or 1A?? or can degrades something inside the phone's/lifespan? All i know the device such iPad needs more Amperes to charge. Please check/see my charger photo below. I'm apologize my english is not perfect. I'm noob beginner. Thank you very much ,appreciate.
bongbongcong said:
Hi, my phone Note 2 baseband/ firmware is N7100UBALI9, but came with power AC charger USA prong(flat) with output 2 Ampere. All knowledge of electronics, I'm just wondering from a professional user (xda devs) is it safe using/charging regular charger output 0.5A or 1A?? or can degrades something inside the phone's/lifespan? All i know the device such iPad needs more Amperes to charge. Please check/see my charger photo below. I'm apologize my english is not perfect. I'm noob beginner. Thank you very much ,appreciate.
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My charger is 2 amp too (bought it Sweden). My older S2 has a 0.7 amp charger (both standard original chargers). The chargers them self can handle the amps printed on them without breaking or extending the charge time. The chargers are more or less "stupid" power supplies. The electronics in the phone handles the battery charge current. The phone even monitors the battery temp, and the charge current can probably be either aborted or limited based on the temp.
My opinion, based on knowledge as a kind of "advanced" electrician...
Note II is designed for the 2A charger, that's what it needs. You can charge with lower outputs, but it'll take a lot longer to do so.
The amperage of the charger does not affect a phone battery life span. The phone draws the amount of amps needed.
I'm guessing since Samsung provided a 2amp charger, that the note 2 should be drawing that much amps. Any other charger with less amps won't harm it, but rather take longer to charge.
Sent from my SPH-L710 using xda app-developers app
So i will not worry. Thanks because i was not sure if okay or not. Thank you guys. Appreciate your answer.
there is a component in the phone which will limit the flow of max current into the phone like the S2 (450amp and 650amp, iirc the values). changer provides 2amps but phone will draw whatever it is needed. in cases if it allows, 2amps speeds up the charging process.
The phone actually draws 1300mA.
change values
sianzb0i said:
there is a component in the phone which will limit the flow of max current into the phone like the S2 (450amp and 650amp, iirc the values). changer provides 2amps but phone will draw whatever it is needed. in cases if it allows, 2amps speeds up the charging process.
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hi! do you know how to change those iirc values? the charger provided with my note2 is rated 2A out. but when i charge, this charger generates a lot of heat. i think the heat is wasted current since the phone doesn't accept that much current. i just want to know how can i adjust these values.
thanks!
psycotrompus said:
hi! do you know how to change those iirc values? the charger provided with my note2 is rated 2A out. but when i charge, this charger generates a lot of heat. i think the heat is wasted current since the phone doesn't accept that much current. i just want to know how can i adjust these values.
thanks!
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your charger is converting Alternating Current from your wall socket into Direct Current for your phone. The process isnt 100% efficient.
In PC's theres normally an efficiency rating that tells you how many watts of AC current is required to produce a certain amount of watts of DC current (converting from 110-240V down to 12V). ie. a 90% efficient power supply will draw 1000W of AC from your wall to produce 900W of DC for your PC. the remainder of that energy is lost in the conversion process and is often released as heat and other forms of energy.
same thing is happening in your charger. in the process of converting AC to DC (110-240V down to ~5V), some energy is lost, and some of that lost energy is released as heat. our note 2 can handle 2A of current with no issues, the heat is because our chargers are not 100% efficient in their conversion, not because the phone cant handle the current.
So, I have powerbank and I have 2 ways of charging: 1A and 2.1A. which one to use when charging my note 2?
Handwritten from my Note 2
Depends on the cable you'd use. Samsung cable will go near 2amp, generic ones do about 1 amp
kebabs said:
Depends on the cable you'd use. Samsung cable will go near 2amp, generic ones do about 1 amp
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I have samsung cable.. So is it smart to charge via 2.1 A ? Can it do some damage on the phone ?
I have a Momax external battery and have charged the phone with the 2.1A port. It didn't heat up, it didn't have any problems. I was planning on measuring the exact amperage that comes out of the samsung charger and the momax battery (iPower Pro), but I didn't get around to it, because I suspect the difference is actually smaller. There are many people who used more powerful chargers to charge their phones faster, and the only thing that degraded was the battery lifespan, but the difference in those cases was upwards of 0.5A between the original and the new charger. I find the 0.1A to be a small difference and I have no problem using the 2.1A port on the iPower.
So to answer your question, no, it won't damage your phone. Theoretically it damages your phone's battery, but it degrades anyway due to charging cycles, so you won't notice any damage caused by the extra 0.1A unless you plan on still using the note 2 10 years from now.
sandulea said:
I have a Momax external battery and have charged the phone with the 2.1A port. It didn't heat up, it didn't have any problems. I was planning on measuring the exact amperage that comes out of the samsung charger and the momax battery (iPower Pro), but I didn't get around to it, because I suspect the difference is actually smaller. There are many people who used more powerful chargers to charge their phones faster, and the only thing that degraded was the battery lifespan, but the difference in those cases was upwards of 0.5A between the original and the new charger. I find the 0.1A to be a small difference and I have no problem using the 2.1A port on the iPower.
So to answer your question, no, it won't damage your phone. Theoretically it damages your phone's battery, but it degrades anyway due to charging cycles, so you won't notice any damage caused by the extra 0.1A unless you plan on still using the note 2 10 years from now.
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Thanks for reply mate ! I was thinking the same, but i needed some sort of confirmation tho
Use the 2.1A one.
The phone should only draw 2A from it anyway, that just means the port is capable of supplying 2.1A.
Using the 1A port will just charge your phone slowly, the 2.1A port should charge it as quick as the official charger, depending on which cable you use.
It is a matter of supply and demand. All USB devices can safely be plugged into any USB charger. Given an unlimited amount of current available from the charger, each device will still only draw only as much current as it is designed to draw. If the charger is rated 2.1 Amps or 5 Amps or 10 Amps, a 1.5 Amp device will still only draw 1.5 Amps. The charge rate will be at maximum Think of it like your house wiring. The circuit may have a 20 Amp circuit breaker in the basement but we plug in 40 Watt bulbs and 100 Watt bulbs and TVs and electric shavers that all draw different amounts of current. The 100 Watt bulb uses less than an amp but is unharmed being plugged into a 20 Amp receptacle (charger). Now we come to the flip side. If the charger Is rated lower than the device it just charges slower than it would if the charger could supply at least as much as the device uses. To go back to our example, the 1.5 Amp device plugged into a 1 Amp charger will take longer to charge that it would with a charger rated 1.5 Amps or higher. My analogy has one hole. If the stuff plugged into the house receptacles exceeds 20 Amps the circuit breaker pops. This will not happen with USB chargers as they limit the current and will not try to supply more than they are rated for. Stick to chargers rated as high as the one that came with your device or higher and you will be fine