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# 1200 mA charger; will it smoke ?

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 lambda30 5th May 2011, 10:34 AM Senior Member - OP Thanks Meter 34 Posts: 261 Join Date: Mar 2011 More Info > 1200 mA charger; will it smoke ? Question: What happens if I connect a Nokia AC-10 Micro-USB charger, that has an output of 5V, 1200 mA, into the phone ? I'm asking this because inside the phone, on the back of it, where the battery compartment is, it says maximum of 1000 mA. So what would happen if I would connect the charger ? Would it end up in smoke ? REPLY

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Quote:
 Originally Posted by lambda30 Question: What happens if I connect a Nokia AC-10 Micro-USB charger, that has an output of 5V, 1200 mA, into the phone ? I'm asking this because inside the phone, on the back of it, where the battery compartment is, it says maximum of 1000 mA. So what would happen if I would connect the charger ? Would it end up in smoke ?
It depends on what the voltage rating for the phone is, if it is 5v, i believe it should be ok, you may find it actually charges slightly faster, if the voltage is higher thats when you can cause damage though.

I am not 100% sure on this maybe someone else can confirm
 lambda30 5th May 2011, 12:36 PM (Last edited by lambda30; 5th May 2011 at 01:47 PM.) Senior Member - OP Thanks Meter 34 Posts: 261 Join Date: Mar 2011 More Info > Phone: 3.7 V, 1000 mA Battery: 3.7 V, 1500 mAh Original Nexus S Charger: 5 V, 700 mA Nokia AC-10 charger: 5 V, 1200 mA Charge time = battery mAh / charger mA = 1500 / 1200 = 1.25 h = 75 mins So the NS battery should charge in 75 mins with the Nokia AC-10 charger. So all the chargers are 5 V rated, ranging from 500 mA (USB cable) to 1200 mA this Nokia charger. For example, with the HTC Desire, I had an 1000 mA charger that worked flawlessly. LE: Never mind, I found the response. Sorry for making another thread on this matter, but I didn't find the other topic when I first searched the threads. http://forum.xda-developers.com/showthread.php?t=897935 If a mod sees this thread, please, do delete it, because it's useless now. Thanks a lot anyway ! REPLY
 cgi 5th May 2011, 01:59 PM Member Thanks Meter 22 Posts: 99 Join Date: Apr 2008 More Info > Just on a side note: Your phone will not necessarily charge faster just because your wall charger can supply more current. It depends on the charging circuit inside your phone, too. If your Nokia charger and the Nexus S conform to the USB charging specification, the phone will know how much current the charger can supply by the resistance between data+ and data- on the USB-plug. But how much current it draws is up to the phone. Also, charging LiIon batteries is not as straight forward as (battery mAh)/(charger mA). It will (most likely) be charged constant current at first and later switched to constant voltage top off charge. I read somewhere that the faster you charge at the beginning, the longer the top off will take. So you will only gain time, if the supplied wall charger was too weak anyway and why should Samsung do that? In any case, if you want to try anything you should be sure to be inside USB specs. I think it is 5V +- 5%, so from 4,75V to 5,25V. Less should not be a problem, but (much) more can and will fry your phone. REPLY
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 lambda30 5th May 2011, 05:30 PM Senior Member - OP Thanks Meter 34 Posts: 261 Join Date: Mar 2011 More Info > Good to know, thanks a lot ! Maybe I'll come back here with a comparison between stock charger and the Nokia one (in a couple of days). REPLY

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i'm using a 2Amp car charger, and it charges really fast, even when the phone is ON, full brightness, gps + streaming BT to car audio

Quote:
 Originally Posted by lambda30 Question: What happens if I connect a Nokia AC-10 Micro-USB charger, that has an output of 5V, 1200 mA, into the phone ? I'm asking this because inside the phone, on the back of it, where the battery compartment is, it says maximum of 1000 mA. So what would happen if I would connect the charger ? Would it end up in smoke ?

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 MarkVis 5th May 2011, 05:56 PM Senior Member Thanks Meter 508 Posts: 1,008 Join Date: Jan 2011 Location: California More Info > i would think that it would charge faster with your nokia charger but your phone will get hotter than normal. i experience this when i use my 1A charger. 1.2A will make it even warmer. i hope you dont overheat your phone. ps. fast chargers (15 min chargers) for Ni-Mh batteries have 7.5A. those kind of chargers come with fans on them to cool the batteries while charging because it gets really hot. REPLY
 lambda30 5th May 2011, 09:23 PM Senior Member - OP Thanks Meter 34 Posts: 261 Join Date: Mar 2011 More Info > Ok guys, thanks a lot, I'll keep in mind all you said. Unfortunately, I've come across a dead Nokia AC-10 charger (don't ask, lol), so I will need to get another one tomorrow. After that I'll compare the 2. REPLY
 markread644 6th May 2011, 07:31 AM Member Thanks Meter 1 Posts: 43 Join Date: Feb 2009 The charging circuit (in the fone) tries to stop the battery blowing up and overheating by pulsing the charge until the battery reaches 70%+ when it drops off and the charge creeps up to 97% (all values approx) when the carge circuit switches off and we are left with a fone at 97%+ (other threads on this topic itself !) I experimented with standard Nexus AC (700mA) and USB Wall Charger (1000 mAH) and Laptop USB Cable (500 mA) and 1 am disappointed at not being able to get a FAST charge in the thing. Here is a plot of the AC Charge (700 mA charger). It never gets used a full power ! http://www.lacbayvilla.com/images/chargingfromAC.png REPLY
 lambda30 6th May 2011, 11:04 AM Senior Member - OP Thanks Meter 34 Posts: 261 Join Date: Mar 2011 More Info > Ok... something is really screwed up... when I connect the phone via the Nokia charger, the touchscreen goes haywire... If I touch it in one spot, it sees the touch in another spot... It even starts apps without me even touching them... weird. Is it too powerful for the phone, or what ? REPLY

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