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So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
Benny_L said:
So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
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You've pretty much answer your own question!
The current supplied by a charger/USB port determines how fast it can charge the battery, which is why the wall charger (1amp) charges much faster than a PC USB port (0.5 amps).
Regards,
Dave
It's almost completely logical.. say you have a 1.5A battery (1500mA) and a 500mAh charger (ie USB) then it will take 3 hours for it to charge but with a 1000mAh charger it will take an hour and a half.
Can't really explain it more than that, so hth.
Well , Yes and No
This is only partly true ......
If you charge it on the PC , max output is 0.5 amps , and data is possible while charging .
Now with Desktop and car charger , the amp can be anything the manufacturer likes but you have to keep the following in mind :
USB Specs state the following :
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In Battery Charging Specification,[32] new powering modes are added to the USB specification. A host or hub Charging Downstream Port can supply a maximum of 1.5 A when communicating at low-bandwidth or full-bandwidth, a maximum of 900 mA when communicating at high-bandwidth, and as much current as the connector will safely handle when no communication is taking place; USB 2.0 standard-A connectors are rated at 1500 mA by default. A Dedicated Charging Port can supply a maximum of 1.8 A of current at 5.25 V. A portable device can draw up to 1.8 A from a Dedicated Charging Port. The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) will occur once both the host/hub and devices support the new charging specification.
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So if your Desire ( Yes , the Desire supports these specs ) detects the short , it will switch to fast charging mode otherwise it will limit the charging current .
Unfortunately , there's no way to know , just by looking at a charger, if it respects the specs or is just a low cost 5V powersupply . I've encountered quite a few ( mostly lowcost) desktop and car chargers that are rated between 1 and 2 amps , but still take bl**dy ages to charge the phone . Checking those with a measuring tool , you usually see the data pins are "Not Connected" instead of being shortened :-(((
Final Word .... don't try to save some money on a cheap charger , you'll regret it Genuine HTC works great , others do the same , but don't expect a $1 charger from Hongkong or whereever to do it !
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
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- Sent via my HTC Desire -
th3 said:
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
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- Sent via my HTC Desire -
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Ya, I noticed the charge slows down considerably for the final 10-15 %
I find myself charging my Desire more than I actually use it, lol.
I found now the answer to this problem: I use a Nokia charger (5v and 890 mA) with a microusb adapter. You can find one on eBay at ~2$
Now it takes about 2 hours from 20% to 100%
Lets hope nothing wrong happens to my precious Desire
look here for a method to charge at ac speed from usb, explains a few things too.
Is this the highest?
http://www.seidioonline.com/product-p/pmc.htm
Post links if you know of higher ones, thank you.
Sent from my ADR6400L using XDA App
There are 2.1A usb adapters, but I don't think microUSB can take advantage of it. The one you linked is a 1A, which is the same as the wall charger HTC gave with the phone. I'm currently using a 1A usb adapter in my truck.
Ok that's probably what I'm looking for then. Are there wall chargers greater than what came with the phone that I can take advantage of?
Your best bet would be to try the USB adapters made for iPads. The Apple products can utilize the 2.1A chargers with their sync cables, but I'm not sure if a microUSB cable can though. I have some 2.1A wallchargers from some of my Apple products, I'll test them later and let you know what I find out.
http://www.verizonwireless.com/b2c/...ryDetails&archetypeId=12299&accessoryId=46370
I just got an Enercell from Radio Shack with dual usbs. Max output is 2.5A divided between the two ports.
http://www.radioshack.com/product/index.jsp?productId=11329448
on sale now for only $14.99. Seems to be of good quality.
The Motorola rapid chargers rock.
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
Most adapters on the market spec more than that, they're usually 500 mA or above. And again, unless you boost the volts, you're not going to be able to push more than 350 mA or so.
So don't waste you're money.
On the other hand, if your going to share a car outlet with another device like mp3 or ipod, then yeah, you'll need a higher output, two port, adapter.
Edit: It just occurred to me that if you're using the phone heavily while charging, then yeah you may need more than 500 mA. My currrent widget shows the phone can draw another 250 mA or so during use. That plus the charge totals to around 600 mA. But depending upon design, the phone may not be able to pull in all 600 mA. A test with a current meter would be real interesting.
The charger shipped with the Thunderbolt is a 1 Amp charger.
If I use a 500 mA charger the Current Widget shows a +450mA charge current. However if I use the 1A charger, I get a charge current of about +850mA.
Given that the google navigation gobbles over 400mA when running, you need a car charger with greater than 500mA capacity of you want the phone to charge at the same time.
Sent from my ADR6400L using XDA App
boingboingbilly said:
The Motorola rapid chargers rock.
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Good to hear, I ordered one today for $11 on ebay. I had heard other people say they liked that one too.
Ecomaniac said:
Guys, unless you mod the usb adapter 5V spec, you aren't doing squat with a "high power" adapter. The device has an input impedence that will draw a certain amount of current at 5v., and that's it.
Standard battery: 1400 mAh
Time to charge: 4 hrs (according to manual)
That's 1400/4 = 350 mA.
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Click to collapse
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
A Li-Ion battery charging process consists of three stages:
· Slow Charge: Pre-charging stage using current of 0.1C
· Fast Charge: Constant current charging stage using current of 1C
· Constant voltage charging stage
During the slow charge stage, the battery is charged with a constant low charge current of 0.1C, if the battery voltage is below 2.5V. The slow charge stage is rarely used during the charging process of a Li-Ion battery.
The fast charge (constant current) and constant voltage charging are the most important stages during a recharge process. Most Li-Ion batteries have a fully charged voltage of 4.1 or 4.2V.
The battery is first charged with a constant current of 1C until a battery voltage reaches 4.1 or 4.2V. The firmware continuously checks the charging current by sensing the voltage at the current sense resistor (Rsense) and
adjusts the duty cycle of PWM output from the MCU. The battery's voltage is checked frequently.
Whenever found the battery's voltage reaches 4.1 or 4.2V, the charger will switch to constant voltage charging mode. The battery is then charged with a constant voltage source at a fixed battery voltage of 4.1 or 4.2 V...When the charging current falls below 0.1C, the charging process must stop.
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Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
mike.s said:
You're making the incorrect assumptions that the charging rate is constant, and charging is 100% efficient. Li-ion batteries can be charged at up to a 1C rate (i.e. 1.4A for a 1400 mA cell). Add the power drawn by the phone itself, and a 1.8 Amp charger might not be unreasonable (1.8 A is the specified limit for micro USB connectors). Whether the phone will actually do a maximum rate charge, I don't know.
This, from a TI Application Note (Google for SLAA287, board won't let me post links):
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very useful, thanks!
walbuls said:
Monoprice has Cig to USB(1A) chargers and the USB to Micro cables in multiple lengths(I ordered 6' ones) for far cheaper than you will find anywhere else
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I second monoprice.
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
eccenpix said:
I tried bunch of cig to usb car charger and none matched advertised output... They all showed Charging (USB). I now use AC inverter and it charges just like a wall charger.
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I suspect you need to find one which properly follows the USB Battery Charging Specification. That link is to the most recent version, which came out on 7Dec2010 (remember Pearl Harbor!). Version 1.1 is easier - a Dedicated Charging Port is indicated by shorting together the data lines (the two middle conductors on a full sized USB connector. By doing so, it indicates the device may try to draw up to 1.8 A of current (although a dedicated charging port is allowed to limit the current to less than that, it must provide at least 1.5 A).
I bought a cheap USB hub with 5 ports, used an exacto knife to cut the traces going to the data lines (the middle two) on all the ports, and then shorted them together on each port. It's now no longer a USB hub, but a USB charger with 5 ports I can used to charge stuff (phone and Bluetooth, quite often). The AC adapter which it came with does 2 Amps. My Thunderbolt says "Charging (AC)" when plugged into it.
So, if you can open up one of your adapters, just solder a jumper between the middle two contacts (make sure they're not connected to anything else).
Just got the Rocketfish premium microUSB at Best Buy and it has a captive coiled cord and a USB port. TBolt says "AC plugged" and reads +670 mA.
Good choice on the Motorola Rapid Charge - I've burned through 3 other cheap car chargers trying to keep my phone alive while using Google Nav and this is the first one to work!
i have the rapid motorola one on amazon
lippstuh said:
i have the rapid motorola one on amazon
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+1 Works great! Battery widget usually shows about +800mA while only charging. Real close to the wall charger
Hi,
I've lost my charger, and I don't know if I can charge it with a charger with 5v - 1A or not, what I do know is that charging with USB is 5v - 500mA.
What's the power of the SE Arc original charger?
On the charger it says output 5V 1A
Is that what your looking for
It's Exactelly what I'm looking for thank you very much
The original SE charger for the arc is the GreenHeart charger EP800. It has got an output of 5V; 850mA.
As far as I know, there's no SE charger with an output of 1A. I've seen chargers with 500mA, 700mA and the 850mA.
My charger got fried during a power surge while holidaying in India so after asking around on the forum, I bought a Nokia AC-10N charger with an output of 5V, 1200mA. I've been using it without any problems. Pretty happy with it. Charges the phone much faster.
Thank you, that helps very much, but I heared charging the phone with higher voltage or higher Amperage can charge it faster, but it lowers the battery life on the long terme, it's appreciated to charge it with lower power in order to preserve battery life
MehdiArc said:
Thank you, that helps very much, but I heared charging the phone with higher voltage or higher Amperage can charge it faster, but it lowers the battery life on the long terme, it's appreciated to charge it with lower power in order to preserve battery life
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Totally true on all counts. You can really use ANY usb charger to charge your Arc, but the higher the mA the faster it will charge. And the higher the mA, the less overall life your battery will have. If it's normally supposed to be good for 5000 recharges, it might drop to 4000 recharges (just numbers pulled out of thin air).
The "Normal" standard for USB power is 0.5A (or 500mA). The iPad for example uses 1.0A, or twice as much as standard. Now in the iPad's case, it refuses to charge with anything less. I don't know if that's true for the Arc or not...if so, and the SE charger is rated at 850mA, then that's probably as low as you'd want to go just to be on the safe side.
Personally, I'm willing to use the iPad's charger and charge a bit faster for a bit lower useful battery lifetime. A new battery I can buy....time spent waiting for my phone to be charged I can't get back
The amperage rating on a charger defines the maximum current the charger is capable of supplying. A 1A charger doesnt force 1A down the throat of whatever's connected to it, if you connect something can only manage to pull a maximum of 500mA then it will only get 500mA.
Consumer power supplies are generally constant voltage. E.g. a 5V charger will supply 5V to anything connected to it. The amount of current that the device will draw at 5V is the amount it was designed to draw, up to the limit that the charger can supply. If the charger cant supply enough, generally you just get slower charging (though some poorly designed devices will just refuse to charge at all). What *will* tend to destroy your device quickly is a voltage mismatch, e.g. connecting a 5V phone to a 12V charger.
You can get constant current power supplies. These ramp up the voltage in order to force the required current out regardless of what's attached to it (even if that's a human being). They are scary.
daveybaby said:
The amperage rating on a charger defines the maximum current the charger is capable of supplying. A 1A charger doesnt force 1A down the throat of whatever's connected to it, if you connect something can only manage to pull a maximum of 500mA then it will only get 500mA.
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Exactelly what I was thinking, thanks.
Now I think I can charge my Arc with 1A without any problem, since it's gonna take only 850 mA from it
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
Can someone tell me why is it that when i charge my phone when USB connected to PC its takes hours together to charge and Wall Charger takes 1/4th of that time why is that can anybody tell me what is the login behind it and which is best way to charge ?
USB only outputs 5v, which is why it takes makes longer. You have more power outputted from the ac adapter therefore it charges quicker. Simple as that. They will both eventually charge the device, but it's recommended you use the wall charger all it's faster, no one likes to wait
+1
U cannot compare usb charging with ur charger as output voltage varies across both n btw usb is jst an alternative for charger it's not a replacement
Sent from my LT22i using Tapatalk 2
You can use a custom kernel and change charging current.
Sent from my GT-N7100
Ok thanks Guys to know what is the main difference
Technically, voltage has little to do with charging. The amperage is what counts. USB on a computer gives ~500 milliamp, where ac chargers give 1-2 amps
Sent from my SGH-I997 using xda app-developers app
For a more detailed answer...
All compatible chargers output the same voltage, 5 volts. (Otherwise they just would burn out the charging circuits in the phone. It can happen both if there's too much volts and if there's too little, but for very different reasons.) However, voltage is not the only characteristic of electricity, the other most important is current, that is, amperes. Think of volts as 'water pressure' and amperes as 'amount of water pumped per minute' through a water pipe -- with real water, those are connected, with electricity they're quite separate.
Every source of stabilized electricity you will find in any kind of power supply will have a set voltage it outputs electricity at, and maximum current it can output. Trying to draw more current than it can supply can damage the power supply, so your phone limits the current it attempts to draw when it detects a standard USB port -- to what the USB standard says it should be able to safely supply. For standard ports, it's 500mA. Galaxy Note II by default plays it safe and draws 425mA. The stock AC charger is rated at 2000mA, and Note draws 1700mA when it detects one. This specifically affects the speed of charging -- AC chargers will charge battery faster, because three times more power gets in.
The USB standard was written before everyone and their mother started using it as a charger, and today, USB ports can usually handle more than 425mA, and on some computers they can supply just as much power as the stock AC charger. There are a few standard ways to detect how much current can a phone safely draw from an USB socket, but not all of them are universally accepted or correctly implemented, so the phone always plays it safe when it can't be sure. If you install a custom kernel, you can directly tell it how much power to draw if you know your USB port can handle it.
:good: :good::good::good::good::good:
aukhan said:
:good: :good::good::good::good::good:
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You can use the app Galaxy Charging Current (GCC) from the S3 thread which can measure the output of the incoming current. It will also allow you to detect faulty cables and chargers, as you will be able to see different ratings with different cables and chargers.
Testing on typical USB ports will get you a reading of 460, while the original charger and a good cable will give you 1800 (about the max current draw for the Note 2).
If you use a known good charger and get a lousy reading, it indicates a bad cable. I once had a cable give a readout of 100. I promptly threw it away.
Yes i am using that thanks nyways