Develop Bugs

charger 5V and .7A

When looking for a charger do I need to make sure it delivers 5 Volts and 0.7 Amps? I was looking for an Igo tip for my portable Igo charger http://www.igo.com/tips/icat/tips/ Does it matter about the tip or just the charger http://www.igo.com/accessories/powerxtender-charger/invt/ps002640004/ The portable charger says 4.26 VDC so I guess thats safe right?
Does it matter about the volts and amps or just the volts?
If the charger is under the recommended numbers it charges slow and thats OK right?
I know if the charger is over the device or battery specs then it charges to fast, gets hot and reduces the life of the battery right? Heres the battery charger I bought http://www.fommy.com/view-full-page...sung+Captivate+i897&cat=Batteries&skuno=88959

The charger just needs to be 5 volts, you can get a charger with higher amperage, the phone will draw what it needs.
Not sure if 4.26 volts would be okay.
Sent from my SAMSUNG-SGH-I897 using XDA App

mesasone said:
The charger just needs to be 5 volts, you can get a charger with higher amperage, the phone will draw what it needs.
Not sure if 4.26 volts would be okay.
Sent from my SAMSUNG-SGH-I897 using XDA App
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The standard calls for 4.4 to 5.25 V.
Most devices operate in the "low power" state which is 4.4V ... in the USB3 standard the same "low power" mode drops to 4V. If a device is capable, it can operate in "high power mode", which is 4.75 - 5.25V and the mode shift is controlled through software on the device itself.
I know that the tolerance for high power mode is 5V (+/- 5%) which would be 4.75-5.25V
If the same holds true for low power then you're looking at 4.4V (+/- 5%) or 4.18-4.62V and your 4.26V is within spec.

Awesome! Thanks a ton for the replies.

[Q] Wall charger question

So i just sold my old blackberry curve and along with it the wall charger i used for my MT4g
so i looked around my house for another corded wall charger as the plug-usb cable combo just doesnt work for me as the cord is way too short for my needs
well i found an older Moto wall charge PN# SPN5334A...it has the same basic specs are the mytouch plug part with the Input: 100-240~200mA 50-60Hz...but the output is 5v 550mA instead of the mytouch plug being 5v 1A
so the question is...will the different of almost a half an amp cause any serious issues other than maybe a slower charge? any potential for damage to the battery or phone or even the charger?
well any help would be great...thanks

No it wont hurt the phone, only way to damage it is to over amp, as in say it was 2.5 amps but however it will slow the charge down I recommened going to a a store that sells computer stuff and picking up a usb extension cord I got a 3 foot on mine and dont see any draw backs as I do with a under amped charger

f1vel66a said:
No it wont hurt the phone, only way to damage it is to over amp, as in say it was 2.5 amps but however it will slow the charge down I recommened going to a a store that sells computer stuff and picking up a usb extension cord I got a 3 foot on mine and dont see any draw backs as I do with a under amped charger
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yeah i never really considered extending the usb cable...i actually have a 6 ft extension cable sitting in my drawer
but i appreciate the info

No problem hope it helped
Sent from my HTC Glacier using XDA App

f1vel66a said:
No it wont hurt the phone, only way to damage it is to over amp, as in say it was 2.5 amps but however it will slow the charge down I recommened going to a a store that sells computer stuff and picking up a usb extension cord I got a 3 foot on mine and dont see any draw backs as I do with a under amped charger
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What's over amp? If the voltage is correct, the higher the amperage the more efficient it(charger) is, as the phone will draw as much as it needs to charge, in this case around 1amp according the factory charger.
Matching voltage is the important part. Too low of amperage will result in slower charge or no charge when using and plugged in at the same time.
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sleepyfu said:
What's over amp? If the voltage is correct, the higher the amperage the more efficient it(charger) is, as the phone will draw as much as it needs to charge, in this case around 1amp according the factory charger.
Matching voltage is the important part. Too low of amperage will result in slower charge or no charge when using and plugged in at the same time.
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All voltage is the force pushing the amps through. Amps is the actual energy. Resistance is a factor too. Check the Watts to see that they match. But don't over amp it as well
Sent from my HTC Glacier using XDA Premium App

I meant there is no such thing as over amp. Amprage rating is for how stout the power supply is. A 5v/2amp supply can charge 2 of these phone with out issues. 500mA will charge but slow. Think of car batteries they are all 12v and the "long lasting" or "performance " ones will have better amp ratings.
Wattage is simply volt x amp, in this case here, volt is the constant.
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sleepyfu said:
I meant there is no such thing as over amp. Amprage rating is for how stout the power supply is. A 5v/2amp supply can charge 2 of these phone with out issues. 500mA will charge but slow. Think of car batteries they are all 12v and the "long lasting" or "performance " ones will have better amp ratings.
Wattage is simply volt x amp, in this case here, volt is the constant.
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If by over amp, you mean over charge? Too much amperage causes a lot of problems, just like too much voltage can cause a lot of priblems
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sleepyfu said:
I meant there is no such thing as over amp. Amprage rating is for how stout the power supply is. A 5v/2amp supply can charge 2 of these phone with out issues. 500mA will charge but slow. Think of car batteries they are all 12v and the "long lasting" or "performance " ones will have better amp ratings.
Wattage is simply volt x amp, in this case here, volt is the constant.
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I've seen phone batterys blow from to much amps... You can go + .5 amps max on a cell phone before things start to go wrong. And that isnt recommended for to long unless you want battery issues
Sent from my HTC Glacier

So did it happen with a 5volt output charger or something higher? I have seen 8v mini usb charger from Motorola around, that will blow out your HTC battery.
Also can happen if there is a problem with the phones charging circuit, not from a 5v charger with a high amperage rating. Now with a higher amp rating, and your phone has issues, the more amps is available, the bigger "battery blow" you can achieve.
Do I recommend more than 5v/1amp? not really, but can you use a 5v/2amp charger or a 5v/4amp charger if it exists? Yes. Is 1amp safer? kinda.
How do I know this? it was an amperage question I answered wrong at my every 1st job interview 11 years ago.
These guys put it in better words than I do.
sivankls said:
DOESN'T MATTER ..if u know the basic Ohms Law..its the max capacity of the charger.(or any source) the current regulating circuits will take care of the real charging current fed to the battery
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tkteun said:
I charge my phone on my computers USB connection all the time, all computers have a maximum of 500mA USB current.
Amps are pulled from the charger, not pushed to the phone.
Voltages are pushed to the phone, not pulled from the charger.
If the phone draws too much current from the charger, the voltage drops to a point where the maximum power (P (Watt) = U (Voltage) * I (Amps)) of the charger isn't exceeded.
According to the USB specification you need at least 200mA with 500mA recommended +5VDC.
More is never a problem, you could even use a 50A power supply without breaking your phone. Practically spoken: I wouldn't do that.
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1A or 2.1 A?

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

[Q] Wall Charger Output

Am I the only one that noticed the output of the included wall charger has gone up? My Note had 1 amp and my Note II has 2 amps (from what I can see on the tiny little writing on the charger body itself). Makes perfect sense... Larger battery = More powerfull charger. Intresting little sidenote (or benefit) that I'm begining to learn about my new toy.
But it bears out a question.... I now have a .5 amp charger for my bluetooth, a 1 amp charger for my old Note..... Could I safely use the higher output charger on my bluetooth, or would that damage the bluetooth (Motorola Sliver) battery pack?

LittleRedDot said:
Am I the only one that noticed the output of the included wall charger has gone up? My Note had 1 amp and my Note II has 2 amps (from what I can see on the tiny little writing on the charger body itself). Makes perfect sense... Larger battery = More powerfull charger. Intresting little sidenote (or benefit) that I'm begining to learn about my new toy.
But it bears out a question.... I now have a .5 amp charger for my bluetooth, a 1 amp charger for my old Note..... Could I safely use the higher output charger on my bluetooth, or would that damage the bluetooth (Motorola Sliver) battery pack?
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Yes. The device will only draw what it can use.
So if you put your 2 amp charger on your BT it will be fine, since it will only draw .5 amps (or less).
If you put your .5 amp charger on your Note 2 it will be fine, but will take a couple of weeks to charge (lol).

Milkman00 said:
Yes. The device will only draw what it can use.
So if you put your 2 amp charger on your BT it will be fine, since it will only draw .5 amps (or less).
If you put your .5 amp charger on your Note 2 it will be fine, but will take a couple of weeks to charge (lol).
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Milkman is correct. The specs on the charger are the maximum amount of current it can safely pump out, not what it will actually put out. Your are perfectly safe as long as the charger is the correct voltage. The battery for the Galaxy Note II (like most phone batteries) is 3.7 volts. Any voltage at least 3.7 volts up to about 5.5 volts is OK. Higher voltage could damage your battery (not likely but possible).
If you try to plug in a charger that has way too little current output and isn't properly protected with a current limiter circuit, it is possible it could burn out your charger as the device tries to grab too much current. So if you put a 0.2 amp charger that is poorly designed and doesn't have a current limiter, you could burn out the charger. But putting a 2 amp charger on a 0.2 amp device just means that the device will only draw 0.2 amps from the charger and everything will be fine.

Thanks for the answers guys... I was hoping to charge my bt a Lil quicker.
Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

If u want faster charging times. Get a 6" micro usb cable. Or shorter if possible! Not going to b that much of a difference but you'll b cutting down the resistance. Longer the cable, longer is gonna take to charge! !!
Sent from my Note 2 with a Lil THUNDER.

Well it came with a 2" cable.
Sent from my SAMSUNG-SGH-I317 using Tapatalk 2

What car charger do you use?/what's the maximum safe amperage?

My car charger broke, so I'm in the market for a new one.
I know 2.1 amps should be pretty safe, but I also see some with 3 amps. Is that still safe?
What do you guys use?

Pretty sure the S3 limits the amperage coming in so anything 1 amp and above should work fine in a car.

Best Buy sells one by Rocketfish that's micro USB and it also has a USB outlet on the plug itself and it's not bulky at all.
I generally shy away from car chargers completely but that charger won me over with it's build quality and specs.
Sent from my HTC6435LVW using Tapatalk 2

pappcam said:
Pretty sure the S3 limits the amperage coming in so anything 1 amp and above should work fine in a car.
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Is that to say that anything over 1 amp is "throttled" to 1 amp so I shouldn't bother getting a 2amp?
re: rocketfish.
I see a bunch on there around the $20 mark. Looks overpriced, just like everything else I've ever seen by rocketfish.

1000 amps would be safe. As long as the voltage is 5v your good. The device will only take a certain amount of amperage, and the output device will only supply what the device needs. Voltage is different, too much of it can damage circuitry.
Sent from my SPH-L710 using xda premium

Okay, so how much can the phone effectively use? Surely 1amp is better than 1/2 for charge speed, but does 2 give you fatter charging than 1,or no?

According to BMW Pro my phone will charge at up to 1200ma on the stock battery and 2000ma when using my Anker 4400mah battery when plugged into a 2.1amp charger. I can confirm that the charging time for the extended battery is only slightly longer than the standard battery but still lasts twice as long in use. So I do believe the phone is capable off making use of a 2.1amp charger it just limits the charge rate to around .5C to protect the battery.
Sent from my cm_tenderloin using xda app-developers app

I use a new Trent 2 amp charger and it works fine. I used to use a 1 amp Motorola charger and it barely charged couple of percent when I had bluetooth, music, waze, gps, and screen on during a 20 minute ride. With the 2 amp charger, I easily get an extra 7% or so after a 20 minute ride.