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312 posts

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  Reply # 1296143 3-May-2015 15:54
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I went through a similar exercise recently and I learnt a few things…

 

Firstly, this free software is INVALUABLE… it tells you the charging rate, and will save you hours of time! https://play.google.com/store/apps/details?id=com.abmantis.galaxychargingcurrent.free

Secondly, it is IMPORTANT to short the USB data lines if you want full charge current. (I didn’t notice any pull up or pull down resistor(s), but if you Google info you will find that different pull up and pull down resister combinations tell the phone if it is placed in a genuine car dock etc). The phone seems to limit the charge rate if the data lines are not connected!

 

Background… I modified a USB 5V cigarette adapter to charge my S3 from the car (I wanted to leave the actual USB out jack on the cigarette adapter available for other devices, so hard wired the 5V only to the phone plug.

Problem was I never achieved more than 460mA charge current as indicated using the software mentioned above. As I always have my phone screen ON whilst driving (I use several programmes to monitor cellular signal strengths / cell tower info as well as using WAZE whilst driving - I'm an Ex cellular radio technician - and yes, my wife thinks I'm crazy, but what the heck - old habits die hard!), I found that whilst the phone indicated it was charging, the battery level actually dropped, very slowly - in other words, the phone was using a little more current than I was able to charge it at. (I guess you could consider that the phone was charging DOWN rather than charging UP!!) Anyway, I tried much heaver cable from the 5V adapter to the phone, assuming the problem was volt drop, but never managed to get a charge rate over 460mA!

 

I later noticed that when I plugged in a USB cable from the adapter's actual output jack to the phone I got a charge current of 1AMP. This really had me puzzled as this cable was much thinner than the one I hard wired from inside the adapter, so I investigated, and discovered the USB data lines are shorted together insider the adapter.

 

So that seemed to be the answer – NOT just the cable wire size as I had previously thought.

 

So, now I have all 4 USB wires run back rm the phone to the cigarette lighter adapter, I get the full 1AMP charge current, and the phone charges up whilst I drive about with the screen on.

 

CONCLUSION: You need to take into account the data lines even if you are just charging, as well as the potential volt drop caused by cable size.

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  Reply # 1296146 3-May-2015 16:00
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Insanekiwi:

I don't think I could find any general consensus as to whether quick charge is battery life or not though.


It's not really logical for a "quick charge" to damage the battery - because it's not the charger or cable determining the charge rate, it's the charge controller in the phone.



 
 
 
 


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  Reply # 1296147 3-May-2015 16:04
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Hiamie:
Secondly, it is IMPORTANT to short the USB data lines if you want full charge current. (I didn’t notice any pull up or pull down resistor(s), but if you Google info you will find that different pull up and pull down resister combinations tell the phone if it is placed in a genuine car dock etc). The phone seems to limit the charge rate if the data lines are not connected! Background… I modified a USB 5V cigarette adapter to charge my S3 from the car (I wanted to leave the actual USB out jack on the cigarette adapter available for other devices, so hard wired the 5V only to the phone plug.


Shorting data pins is only essential on old, poor quality chargers. It is not needed on newer chargers that will auto sense the device and set charging times accordingly.

I know a lot of people keep going on about airports, planes etc having USB ports, but you can guarantee that 100% of these ports are non smart chargers and will not charge a modern device ay anything beyond 450mA. It's when you're in a situation like this that spending a couple of $ to have a fast charge dongle to short the data pins comes essential.

I know I've just mentioned the Anker chargers in the last post but I can't emphasise (and there is a whole thread on here about these chargers) how fantastic they are. US$30 gets you the best USB charger on the market with a few of the best USB cables on the market. You'll never need to buy another charger ever, and will get maximum charging performance from every device you plug in.

The simple reality is most aftermarket chargers that you'll buy, particularly in retail, are nothing but overpriced pieces of junk.



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  Reply # 1296175 3-May-2015 16:26
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sbiddle:I know I've just mentioned the Anker chargers in the last post but I can't emphasise (and there is a whole thread on here about these chargers) how fantastic they are. US$30 gets you the best USB charger on the market with a few of the best USB cables on the market. You'll never need to buy another charger ever, and will get maximum charging performance from every device you plug in.

The simple reality is most aftermarket chargers that you'll buy, particularly in retail, are nothing but overpriced pieces of junk.


Thanks for that.

In my case I am referring to my experience using a simple (and very cheap) cigarette car charging adapter and with me modifying the wiring using just the 5 Volt lines only.

At home I use QI charging - very slow and inefficient I know, but convenient as I don't need to plug anything into the phone - just place it on top of the charger pad. If I need to charge quick at home than I plug into the original charger that came with the phone with a good cable.

A smart, good quality charger will no doubt be the best option where possible.

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  Reply # 1296180 3-May-2015 16:46
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the ports on the anker are hit and miss on both my note 3 and 4 if they will do a decent speed or sit at 460mA.

The note 4 is brilliant on a quickcharge 2.0 capable charger, but putting a charger doctor on one of those results in a cooked chargerdoctor when it goes up to 9V. I would like to replace my wired in charger in the car with a quickcharge 2.0 capable one but have yet to find one that is made for wire in, can only find crap cigarette lighter plug ones.




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  Reply # 1299872 7-May-2015 14:21
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Short cables

I have a very short (12 cm or so) and fat USB cable at home which I have found to be significantly faster than regular Samsung or anything else.

I can't recall what it came with originally, but I always try to charge my S4 with it, and as OP stated replacement batteries are cheap

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