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Old 01-10-2011, 09:37 AM   #1
jocampo
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Can I safely charge my Kindle 3 or Kindle DXG with my smartphone wall adapter?

I posted this one as part of an old thread but it certainly looks like was a too old thread. Trying with a new one:

Cannot find my Kindle 3 wall adapter (I do have the USB cable though) can I safely charge my Kindle 3 or Kindle DXG with my HTC HD2 wall adapter?

Here are the details:

HTC HD2
Output 5.0 Volts, 1 Amps

Kindle 3 (I think these are the standards)
Output 4.9 Volts, 0.85 Amps

If I recall well and from my old University books as long as voltage is close enough (and current same or more) there should be no issues. Can anyone confirm or denying?

Thanks in advance,
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Old 01-10-2011, 09:53 AM   #2
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here's my thread on a similar issue.
i have a wall adapter too, different from the amazon-given one, so i asked around before using it. got some really good advice, used it and everything went fine.
from what i can see your adapter's specs are a bit higher than mine so i'd say it works but i'm not an expert.
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Old 01-10-2011, 09:57 AM   #3
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I haven't used my Kindle adapter since I got my new phone half a year ago. It has the micro usb standard as well and I have only one charger plugged in.
I've got Kindle 2 btw, but don't think there is any difference.
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Old 01-10-2011, 10:23 AM   #4
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A computer USB port which is a supported method of charging a Kindle will give 5V at 500mA so your phone charger is fine. The UK Kindle charger is 5V at 850mA. Not sure why your one is 4.9V. The higher current capacity of the Kindle charger may mean the Kindle charges faster but it will be perfectly okay with ~500mA as that is the standard.
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Old 01-10-2011, 01:02 PM   #5
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I've been using my Blackberry charger and it appears to be working and I have not detected any SMOKE.

I will say that the other day, I tried using the rear port on my desktop with a usb-extention-cord. Something did not go correctly. While the k3's power-light went on (showing a connection and charging), the k3 never showed up as another drive on my computer. I don't know if the longish extention cord was the problem or the rear port but then my k3 rebooted. All was well but I'm not ready to redo that experiment.
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Old 01-10-2011, 01:15 PM   #6
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USB is USB, whether it is coming from the computer, adapter or other source. USB (1 and 2) is limited to 5V DC. I have not learned enough about USB3 to know if it has the same voltage limitations...

Only if there is some sort of out of the ordinary proprietary device that uses a USB style type connection with their own 12V or other output voltage is it NOT recommended. That is why it helps to look at the adapter itself to make sure it says around 5V.

For the Amps, anything from 500mA (0.5A) to 1000ma (1A) will work fine, the device will use/draw what it is able to which is typically 500-850mA (0.5-0.85A).

Last edited by screwballl; 01-10-2011 at 01:20 PM.
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Old 01-10-2011, 01:18 PM   #7
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Don't try this with a Sony. The one time I did it, the battery drained and got very hot.
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Old 01-10-2011, 02:01 PM   #8
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I was about to post a thread with just this question! Thanks to those who answered. (karma++)
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Old 01-10-2011, 03:17 PM   #9
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I second the thanks for the thread. I was looking at my mobile charger the other day (HTC Desire) and wondered if I could use it.

Cheers everyone for answering my question before I asked!
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Old 01-10-2011, 07:20 PM   #10
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To all!

Thanks a lot! I just removed dust from some old University books and found this link too: http://www.techspot.com/vb/topic8532.html

You guys were right. As long as Voltage is the same and current same or a bit higher, it should be find, assuming the battery is not defective or get too hot.

Hope this thread can help someone else as well.
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Old 01-10-2011, 08:14 PM   #11
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I use my HTC EVO adapter and my Kindle adapter interchangeably. Before I did so, I checked and found that iGo has the same tip listed for both, which gave me some confidence that smoke would not ensue, and it didn't. (A97 is the Kindle 2/3 tip. See what's listed for your phone.)

Last edited by whitearrow; 01-10-2011 at 08:16 PM.
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Old 01-10-2011, 08:20 PM   #12
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Quote:
Originally Posted by DixieGal View Post
Don't try this with a Sony. The one time I did it, the battery drained and got very hot.
I think they're really talking about the micro usb that cell phones have. The new Sony's use the same micro usb that cell phones and Kindles have. The upside is I can use the same port for books and charging.
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Old 01-11-2011, 01:26 PM   #13
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Wow, this was my top question, and part of the reason I registered! THanks for all the info!
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Old 01-11-2011, 04:01 PM   #14
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I like that the K3 has a standard micro USB. I thought I would only have to bring one cord for my blackberry, personal phone and K3. But nooooo, my motorola phone says I am using an unauthorized charger, and refuses to charge. Verizon told me I could buy a special USB cord, but that kinda defeats the purpose, don't it?
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Old 01-11-2011, 06:54 PM   #15
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The problem is the pins that connect to the devices themselves are typically custom for that device, even if the port itself is different.

I have a Garmin GPS and wifes Motorola phone that have the exact same plug on the device side, yet one does not work on the other... BUT I did find out the Garmin cord/plug is universal where the cell phone is not.

Mine looks like this on the Garmin and cell phone:



The USB specs only state that the square end like what plugs into a computer must conform to standards, at the other end companies can use whatever connector they want, even if it is the same as other devices.

I need to find a 120V to 5V USB with 5 USB Ports on it for charging...
Devices with a USB charge cord:
Nintendo DS
Samsung Cell phone
Motorola Cell phone
Garmin GPS
Kindle

I may pick one of these up just for charging.

I have a few others but they are rarely used like my handheld GPS for geocaching...

Last edited by screwballl; 01-11-2011 at 07:01 PM.
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