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Would this charge the streak?


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#1
kev24k

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http://www.engadget....king-it-a-bett/

I'm thinking about getting two. One for next to the couch and another for by the nightstand.

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#2
kev24k

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Specifications:
Input voltage: AC 100 to 125V 50/60Hz
Output voltage: USB: DC 5.0V 2100mA (2.1 amps)

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#3
Fone_Fanatic

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5v and 2.1A.. it would charge it.
The dell home USB wall charger's output is 5V 1.0A.. so at 2.1A would definitely charge it.

Edited by Fone_Fanatic, 19 January 2011 - 02:08 AM.

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#4
kev24k

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Sweet. Getting two of these. This is going to solve my overcrowded socket problems.

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#5
Nomgle

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5v and 2.1A.. it would charge it.
The dell home USB wall charger's output is 5V 1.0A.. so at 2.1A would definitely charge it.

The Streak requires a charger that presents a data connection on the middle two USB pins (ie, they're shorted together).

If that FastMac sockets don't do this, then they won't charge the Streak ! The high-ampage connection is only half the problem...

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#6
zoidster

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I don't want to cause confusion , but I have various USB chargers here (Can't begin to tell you what they are or where the came from )

I have noticed that some of them that DIDN"T charge the Streak on 1.6 / 2.1 , now DO charge it on 2.2 !!

I a 100% certain of this , and have no idea why this should be ? But my advice would be to retry any chargers you haven't tried since upgrading.

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#7
zigzagindex

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I don't want to cause confusion , but I have various USB chargers here (Can't begin to tell you what they are or where the came from )

I have noticed that some of them that DIDN"T charge the Streak on 1.6 / 2.1 , now DO charge it on 2.2 !!

I a 100% certain of this , and have no idea why this should be ? But my advice would be to retry any chargers you haven't tried since upgrading.


would the Output voltage 2100mA (2.1 amps) damage the streak, it is 1000mA anyway?

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#8
GabbaGabbaHey

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would the Output voltage 2100mA (2.1 amps) damage the streak, it is 1000mA anyway?

No - 2.1A is just the maximum current (not "voltage" - this will always be 5V for USB) that the charger can provide. The Streak will only draw as much current as it requires.

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Philip

#9
Fone_Fanatic

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The Streak requires a charger that presents a data connection on the middle two USB pins (ie, they're shorted together).

If that FastMac sockets don't do this, then they won't charge the Streak ! The high-ampage connection is only half the problem...


Not true. When you short the two middle connections D+ & D-, your canceling out the data connection and turning it into a dedicated charger (no data transfer).

See this link for more info on USB pin out and specifically this part:

Dedicated charger mode:

A simple USB charger should short the 2 data lines together. The device will then not attempt to transmit or receive data, but can draw up to 1.8A, if the supply can provide it.



I don't want to cause confusion , but I have various USB chargers here (Can't begin to tell you what they are or where the came from )

I have noticed that some of them that DIDN"T charge the Streak on 1.6 / 2.1 , now DO charge it on 2.2 !!

I a 100% certain of this , and have no idea why this should be ? But my advice would be to retry any chargers you haven't tried since upgrading.


I noticed the exact same thing!!
I bout this from amazon and it didn't work when i first got it (i think i was on 2.1). But still kept it to use it with my ipod, bb, and just to have a USB port in my car and now on 2.2 it DOES work with the streak. Get it here from amazon i recommend it cuz it can also be hardwired to your fusebox.
Posted Image

would the Output voltage 2100mA (2.1 amps) damage the streak, it is 1000mA anyway?


First, you have to realize there is a difference between Voltage Amps and Ohms, also just as GabbaGabbaHey stated. Although it puts out 2.1A, the Streak will only "Draw" 1.0A so your fine.

I'm not gonna get into Ohm's law and all that good stuff (i'm an engineering major, can't you tell ;) ) but with amperage the device "draws" it.

Now you would have a problem if the device requires more amperage then the supply.
So if we switched the numbers say the device requires 2.1A to charge and the supply is only 1.0A, then the device would suck 2.1A through a 1.0A supply and then it would melt the wires and do all sorts of stuff you wouldn't want it to do.

Edited by Fone_Fanatic, 19 January 2011 - 10:58 AM.

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#10
zigzagindex

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Not true. When you short the two middle connections D+ & D-, your canceling out the data connection and turning it into a dedicated charger (no data transfer).

See this link for more info on USB pin out and specifically this part:
I noticed the exact same thing!!
I bout this from amazon and it didn't work when i first got it (i think i was on 2.1). But still kept it to use it with my ipod, bb, and just to have a USB port in my car and now on 2.2 it DOES work with the streak. Get it here from amazon i recommend it cuz it can also be hardwired to your fusebox.
Posted Image
First, you have to realize there is a difference between Voltage Amps and Ohms, also just as GabbaGabbaHey stated. Although it puts out 2.1A, the Streak will only "Draw" 1.0A so your fine.

I'm not gonna get into Ohm's law and all that good stuff (i'm an engineering major, can't you tell ;) ) but with amperage the device "draws" it.

Now you would have a problem if the device requires more amperage then the supply.
So if we switched the numbers say the device requires 2.1A to charge and the supply is only 1.0A, then the device would suck 2.1A through a 1.0A supply and then it would melt the wires and do all sorts of stuff you wouldn't want it to do.


Thanks very much, this clarifies something.

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#11
Nomgle

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Not true. When you short the two middle connections D+ & D-, your canceling out the data connection and turning it into a dedicated charger (no data transfer).

Not true ? You just agreed with me !

Read your post again ;)

Edited by Nomgle, 19 January 2011 - 12:49 PM.

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#12
Fone_Fanatic

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Not true ? You just agreed with me !

Read your post again ;)


umm... maybe you made a typo in your initial post?

The Streak requires a charger that presents a data connection on the middle two USB pins (ie, they're shorted together).

If that FastMac sockets don't do this, then they won't charge the Streak ! The high-ampage connection is only half the problem...


Did you mean to type prevents ? if so then we're agreed.. lol
Funny how 1 letter can throw off the entire meaning of the sentence :)

And as i've experienced and Zoidster noted as well, this is no longer the case for 2.2

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#13
kev24k

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So....it won't charge the streak?

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#14
rovex

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HTC phone chargers will charge the streak, but of course you still need the cable. They are very cheap i think i have 3!

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#15
Fone_Fanatic

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So....it won't charge the streak?


Yes its capable of charging the streak.

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#16
DMax99

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#17
Stephen Hyde

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ive noticed i can charge my streak quite happily using an apple or htc usb charger adaptor and the streaks usb cable, works fine here

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Devices: Dell Streak(O2 MBB), Nokia E63(O2 PAYG), Nokia N900(T-Mobile Contract)| Notion Ink Adam(PixelQi+3G+WiFi | HTC Wildfire | Nexus One
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#18
DMax99

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hi,

would any of these three charge our streak?

http://cgi.ebay.com....e=STRK:MEWAX:IT

http://cgi.ebay.com....e=STRK:MEWAX:IT

http://cgi.ebay.com....=item2a0f006b21

CHEERS!



these ones have output larger than 5.0V and smaller than 1.0A....so will they charge the Streak alright?

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#19
mackeb

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First, you have to realize there is a difference between Voltage Amps and Ohms, also just as GabbaGabbaHey stated. Although it puts out 2.1A, the Streak will only "Draw" 1.0A so your fine.

I'm not gonna get into Ohm's law and all that good stuff (i'm an engineering major, can't you tell ;) ) but with amperage the device "draws" it.

Now you would have a problem if the device requires more amperage then the supply.
So if we switched the numbers say the device requires 2.1A to charge and the supply is only 1.0A, then the device would suck 2.1A through a 1.0A supply and then it would melt the wires and do all sorts of stuff you wouldn't want it to do.


I'm not exactly sure what you are trying to talk about there; if I'm the only one out of the two of us who is confused. The A in 2.1A stands for ampere. Volt-ampere is expressed VA, and according to Wiki useful "only in the context of alternating current (AC) circuits". Seems to me chargers are DC, but what do I know. Anyways, what you said makes no sense as it stands. I mean with regard to the topic, I don't see how there would be any need to go beyond the symbols and concepts of "V" and "A", "mA" and "mAh" respectively. The input V of the Streak must be lesser or equal to the output V of whatever you want to charge it with, the rest only seems to be relevant as far as the efficiency of charging is concerned.

How do I know that, since I'm not an engineering major or anything like that? I recently got myself ripped off buying a portable charger from Philips. It was the only one the store had, and it looked really good and said "up to 30 h of extra power", so I thought there wouldn't be any problems using it with the Streak. I was wrong, but at the same time not to the degree you are implying.

Now I'm completely ignorant when it comes to physics, but the Philips charger states that it puts out 350 mah, i.e. 0,35A per hour (which is what mah means). It also draws this amount, and its capacity is 2A, so that's already a very strong disadvantage, because the time it takes to fully charge it is (in principle) x hours where 2000/350 = x, i.e. a lot of time. To contrast this, the Streak draws 1000 mah, and with a capacity that seems to be around 1500 mah it takes around 1.5 hours to fully charge that battery.

But it has to be said that the main disadvantage isn't the time it takes to fully charge the external battery, but the time it takes for it to charge the Streak, in as much as we grant that we don't depleat the external battery as often as the Streak's. In theory, at least. Let's say the Streak has a battery with a 1500 mah capacity, the time it should take for the Philips junk to recharge it is around 4 hours, granted all the specs are correct.

I was ripped off in the sense that the store hadn't pulled the Philips charger off the shelves even though it's almost 5 years old as a product, and the technology it uses is completely inferior to other more up-to-date products. External batteries today have power outputs to match smartphones and tablets. However - and this is important - there was no burnt or melted components involved in this disappointment.

My experience is the following: I had the opportunity to charge the external battery for about 4 hours in a coffee shop, while at the same time recharging the Streak (which took the usual approximate 1.5 hours). According to the LED indicator I would have managed to charge it to around 75% in that time. The same night I was using the Streak and depleated its battery. I didn't have any possibilities to recharge from a power socket, so I pulled out the external battery, the so called "powerpack" (lol). I attached it to the Streak, and it started charging. I guess I reached something like a 25% charge when the charger's battery was depleated. I would estimate that this took around 20 - 30 minutes. Again - no melted or burnt components involved in either device.

But it's strange, isn't it, that the charger indicating a 75% charge would only manage to yield a 25% charge in the Streak, and even stranger that this took as little time as 20 minutes. The Philips user manual states that this problem is due to the charger not being fully charged. I don't get the logic of that statement, but fine. Still it doesn't explain why the Streak managed to pull a 25% charge from it in only 20 minutes. Independently of how the LED indicator on the charger works, and the de facto capacity of its battery, the charge put into the Streak would have to be somewhere 375 ma, provided that the Android 2.2.2 indicator is fairly accurate. That should have taken more than an hour, if the output of the charger was in fact 350 mah.

The next day, yesterday actually, I started searching online and reading up on batteries in general. I found this thread. I'd like to add, except for my own experience, that there are a number of sources stating that you can charge a device with an input power larger than the output power of the charger but that this would take proportionally longer time than if the output power of the charger was the same or greater than the input power of the device being charged. Among these same sources, now lost in the browser history of another public computer, I found it stated that there would be a problem if the charger and the device to charge had incompatible voltage input/output, that is to say if the voltage input of the device to charge was greater than the voltage output of the charger. This could, according to the sources, cause problems in similar terms to what I quoted above.

I've used the same combination again a few times, mostly to test, and there haven't been any issues at all. The same thing has been stated elsewhere, for example regarding charing the iPad with the iPhone's charger.

The consensus, apart from the unsolved mystery of how my SCE4430 managed to charge the Streak with over 350 ma in less than an hour, even though it specifies an output power of 350 mah, is that it's possible to charge the Streak with any charging device that has an output voltage greater than its input voltage of whatever it is, 5 something it seems, regardless of its current output. As an engineering major, I take it you would be convinced by empirical facts such as these, and therefore it seems that you've made some mistake somewhere here.

Next time I buy an external charger I will look for a capacity that's not too great, in order to be able to fully charge it relatively quickly, with a power input that's as high as possible, for the same reason, and with a power output that's at least equal to that of the Streak, i.e. 1Ah, so that it can recharge as quickly as it's capable of. Obviously the voltage output would have to be compatible with the input of the Streak as well. For example, with the input and output of the external battery both being 1A and the capacity being between 1500 and 2000 mah, I should be able to buy one or more and use them with around the same time consumption involved in charging as that of the Streak's own battery (the stock one and not the third party 4800 mah battery that can be found for sale online).

That's still just hypothetical though, as the 350 mah of the piece of crap from Philips. I won't know until I fork out another 40€ or so to find out. But as long as the voltage is compatible, so that the output of the charger is greater than that of the input of the Streak, there shouldn't have to be any fatal disappointments involved, at least.

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