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microUSB chargers and Kindle

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Showing 1-20 of 20 posts in this discussion
Initial post: 1 Feb 2012 09:39:08 GMT
Argy Bargy says:
I know this question has been posted several times in this forum already, but none of them seemed to specify the Kindle version. It will be a huge help if someone would confirm my assumption as I do not want to carry all sorts of cables and charges for my new Kindle v4 when I travel. I checked my Kindle 4 this morning and found out the power input should be 5v - Max 500mA.
My blackberry charger says 5v - 700mA and the HTC charger says 5.2v - 1A. I have been using the notebook USB port to charge Kindle until now. But on this occasion, I will not have a computer and will have to rely on the mains. Can someone advise, based on the Voltage and Amp numbers on BB and HTC chargers, whether they will damage the Kindle hardware/battery? Many thanks.

Posted on 1 Feb 2012 09:54:07 GMT
J. H says:
I've been using my blackberry charger for my kindle ever since it arrived in Sept 2010. NO problems so far.

Posted on 1 Feb 2012 10:26:36 GMT
Jwepjb says:
500ma is half an amp
your blackberry is approx 3/4 and your htc is 1amp which is 100% larger than than the max @ 500ma
i would think that blackberry charger would be fine but i wouldnt want to use the htc with a kindle

Posted on 1 Feb 2012 10:33:18 GMT
Last edited by the author on 1 Feb 2012 11:07:05 GMT
Lucy Lou says:
Any micro USB charger will charge the Kindle, so you don't need to worry.

A charger may supply up to 1 amp, it does not mean that the kindle will be delivered that much and it will instantly blow it. Not at all. The tolerances are much better than that.

The USB port on your computer, for example, will deliver more than 1 amp and that and is perfectly safe to use to charge the Kindle, seeing as they supply you with the USB cable as standard in the first place.

The charger for your BB will be perfectly fine and for reference the charger for the HTC Desire is perfectly fine too.

Posted on 1 Feb 2012 10:35:15 GMT
Argy Bargy says:
Thanks for the inputs, I remember reading a post earlier here which said the native Kindle charger output was 5.0v - 0.85A. It didn't specify the Kindle version number, guessing by the posted date of July 11 it must be v3.
I am hesitant to throw another 12 quid for a Kindle charger (I know there are cheaper clones on eBay and Amazon) if I can live with either the BB or HTC chargers.
Has anyone got a Kindle charger for Kindle v4? Is it showing 0.85A output?
Based on Jwepjb's comments, I guess if I use the HTC charger it would damage Kindle since it has a higher Amperage output.

Posted on 1 Feb 2012 10:36:44 GMT
Argy Bargy says:
Thank you Clagg.

In reply to an earlier post on 1 Feb 2012 10:54:15 GMT
J. H says:
The K4 charger is the same one that was supplied with the K3, and yes, it does stipulate 0.85A.

Posted on 1 Feb 2012 11:04:57 GMT
CUchimmy says:
Items draw the current that they require - the current isn't pushed into them. For example if you have a cooker point in your kitchen it will probably be either 30A or 42A. That does not mean that your cooker will draw that. It only draws what it requires. If the cooker short circuits and draws too much the fuse will blow. It is only if you have fault in the Kindle that too much current could be harmful.

Posted on 1 Feb 2012 11:36:30 GMT
Argy Bargy says:
Thanks CUchimmy, very useful tip indeed.
Ta J. H.

Posted on 4 Feb 2012 16:26:31 GMT
Cuchimmy is right. The charging device needs to be capable of supplying at least or more than the current (amperage) required by the kindle. If the kindle only requires 0.85A (850mA) then a charger capable of supplying 1A (1000ma) is perfectly OK. If you use a charger that can only supply less than the Kindle requires, then you could damage the charger and depending how if fails possible the kindle as well. Better bigger than too small.

It is important for the voltage to be correct.

Posted on 10 Feb 2012 15:12:05 GMT
New user J says:
Does anyone know if an Amazon AC adapter will work in the USA as they are on 110 volt.

In reply to an earlier post on 10 Feb 2012 16:08:20 GMT
CUchimmy says:
Yes it will. Most are multi-voltage, and it does not matter the input voltage (110/230/240) The adaptor will give out the correct voltage and ampage.

Posted on 10 Feb 2012 17:11:59 GMT
Bibilofilia says:
I bought this

UltimateAddons Worldwide Dual USB Mains Charger for Samsung Galaxy Tab (GT-P1000), with 2 Metre USB Cable, Charges 2 Devices at same time, including other Tablets, i.e. Apple iPad

Absolutely superb - can charge a tablet AND a Kindle at the same time. Or two Kindles :)

And it has foreign wotsits, so if you go away on your hols you just take the bit that plugs into your condo in Florida or apartment in Greece or whatever.

In reply to an earlier post on 10 Feb 2012 21:36:00 GMT
New user J says:
Thanks for the information. it will save me having to purchase a new adapter.

In reply to an earlier post on 4 May 2012 17:39:00 BDT
Last edited by the author on 4 May 2012 18:08:12 BDT
J. Kurz says:
I have a same problem. Just from the past experience I know that you can't charge the professional video camera at higher rate (faster), it destroys the battery. There was actually a switch on the battery charger for that reason and some cameraman forgot to switch it to the correct rate and they eventually destroyed the battery. But is 1 Amp too much? Amazon sells these adaptors rated at 850mA and nobody complains (yet). By the way USB port on the computer supplies 500-900mA (depending on version).

Posted on 4 May 2012 18:04:31 BDT
J. Kurz,

If you read Cuchimmy's post (1 Feb 2012 11:04:57) followed by mine (4 Feb 2012 16:26:31), you will see that it doesn't matter about the current available being higher.
The professional video camera batteries that you mention probably have dedicated `chargers' containing the electronics which control the charge rate of the batteries. The kindle power adapter acts as a `power supply'. The electronics controlling the charge rate of the battery are located in the Kindle itself. So the only requirement is that the power adaptor used supplies the correct voltage and is capable of supplying at least as much current as is required to power the device and charge the battery. It doesn't matter if the power adaptor can supply more current than is needed. The kindle will only draw as much current as it needs.

In reply to an earlier post on 4 May 2012 18:19:26 BDT
Last edited by the author on 4 May 2012 18:31:44 BDT
J. Kurz says:
thank you for the answer, that makes perfect sense (now I noticed Cuchimmy's and yours older posts too). True, a charger is a regulated power supply ( some are called trickle chargers), while AC-USB adaptor is just a power supply like any electric outlet in the house and unit draws as much current as it needs. Of course the voltage (5V) has to be correct. What was I thinking!

Posted on 4 May 2012 18:34:29 BDT

When I bought my Kindle I contacted Amazon about the possibility of using the iPod Nano charger, which is 5V x 1A, and they said I can, there would be no problem. Furthermore, I have charged my Kindle from a USB emergency charger also with 5V x 1A and it went fine.

During my research I read on one of he electronics forums that USB chargers works in a different way, so when a charger says that it charges on 500mA it means that it will "suck" 500mA from the energy source regardless how many amperes that source is capable of supplying. Though I am not sure how accurate this information is.

In reply to an earlier post on 4 May 2012 19:12:52 BDT
DaveyH says:
It's completely accurate.

In reply to an earlier post on 4 May 2012 19:33:22 BDT
Last edited by the author on 4 May 2012 19:36:09 BDT
J. Kurz says:
Hi Davey H and Omar Dhaher,

Yes, it is accurate, as long as the voltage is 5V, current rating of AC-USC Adaptor is not important providing it is higher than the device being charged. Thank you all for the clarification.
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Discussion in:  kindle discussion forum
Participants:  11
Total posts:  20
Initial post:  1 Feb 2012
Latest post:  4 May 2012

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