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Old August 18th, 2013, 07:19 PM   #1 (permalink)
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Default Cable to charge

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Not long ago I bought one of those car chargers that can charge 2 phones at the same time. Soon I noticed that charge the phone to slow so I tried to go around. What I did was put in that charger the original cable from the phone. So now is balanced and work perfect. A crap charger with a good quality cable. The problem now is that the other way around (the phone charger with the crap cable) makes the phone takes ages to charge. So I'm looking for a cable on ebay but in the past I bought one of those with 3m for my iPhone and was crap. So I want to know if anyone have any good experience with a seller on ebay on this item.

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Old August 19th, 2013, 05:33 AM   #2 (permalink)
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I cannot recommend a specific seller but you want a short thick cable. The current is inversely proportional to the resistance and resistance is proportional to the length and inversely proportional to the cross sectional area of the cable. A long thin cable will not work well compared to a short thick one.
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Old August 19th, 2013, 09:33 AM   #3 (permalink)
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No, but mine is short thin and crap. Isn't good quality. I need quality. Anyone tried the new flat ones from ebay?
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Old August 19th, 2013, 09:42 AM   #4 (permalink)
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I cannot recommend a specific seller but you want a short thick cable. The current is inversely proportional to the resistance and resistance is proportional to the length and inversely proportional to the cross sectional area of the cable. A long thin cable will not work well compared to a short thick one.
I might agree on thickness, but I don't think you're going to get serious voltage drop at the voltages/distances typical with cell phone charging.

I would suspect even that the cable the OP is complaining about was defective, as opposed to a bad design.
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Old August 19th, 2013, 01:04 PM   #5 (permalink)
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I might agree on thickness, but I don't think you're going to get serious voltage drop at the voltages/distances typical with cell phone charging.

I would suspect even that the cable the OP is complaining about was defective, as opposed to a bad design.
All depend the quality of the wires inside of the cable. One of my collegues she bought the 3m cable for the iphone and charge so quick then the original one. I just didn't had luck with purchase. That's why I was asking for feedback
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Old August 19th, 2013, 01:28 PM   #6 (permalink)
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It'll probably cost a little more than some eBay sellers, but try HDMI Cable, Home Theater Accessories, HDMI Products, Cables, Adapters, Video/Audio Switch, Networking, USB, Firewire, Printer Toner, and more! - Monoprice.com. They sell quality cables for a reasonable price.
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Old August 19th, 2013, 02:10 PM   #7 (permalink)
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All depend the quality of the wires inside of the cable. One of my collegues she bought the 3m cable for the iphone and charge so quick then the original one. I just didn't had luck with purchase. That's why I was asking for feedback
Quality cables have written their AWG numbers on their sheath.
Most microUSB cables have just 28 AWG for data and power wires both. This is enough for data but not enough for power.
If a cable of 1m, driving an amperage of 1A, has better 24 AWG power wires the voltage drop caused by resistance would be about 0.5V less than with 28 AWG power wires.
Note, the USB standard voltage should be 4.75V to 5.25V on the phone's port while charging

So you'd look for a short 24AWG/28AWG (power/data), e.g. from DeLock.

BTW, the voltage drop calculator on that web site could give you an idea of the voltage drop's dependence by cable's AWG and cable's length ... note, for a cable of 3m you have to calculate 6m (round trip distance)
http://www.powerstream.com/Wire_Size.htm

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Old August 19th, 2013, 02:13 PM   #8 (permalink)
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You may want to check the charging amps on the charger that you are having problems with before you go searching for a different cable. There are apps on the market that will show what your charging amps are. I have (what used to be) a good charger that charges my S4 very slowly. It only reports 800mA when charging. I bought a new, two port charger like you described and it reports 1900mA for charging and charges the phone quite quickly. The Mains Charger that comes with the Galaxy phones charges at 1900mA also and charges the phone quite quickly, even with the long thin cable that was provided with the phone.

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Old August 19th, 2013, 03:43 PM   #9 (permalink)
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You may want to check the charging amps on the charger that you are having problems with before you go searching for a different cable. There are apps on the market that will show what your charging amps are. I have (what used to be) a good charger that charges my S4 very slowly. It only reports 800mA when charging. I bought a new, two port charger like you described and it reports 1900mA for charging and charges the phone quite quickly. The Mains Charger that comes with the Galaxy phones charges at 1900mA also and charges the phone quite quickly, even with the long thin cable that was provided with the phone.

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The charger is ok, because if I put the original cable the phone charge perfect. Those numbers that you all mention I need to ask to the sellers
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Old August 19th, 2013, 06:53 PM   #10 (permalink)
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Quote:
Originally Posted by Harry2 View Post
BTW, the voltage drop calculator on that web site could give you an idea of the voltage drop's dependence by cable's AWG and cable's length ... note, for a cable of 3m you have to calculate 6m (round trip distance)
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies and wire strength

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That surprises the [blank] out of me. I'm used to dealing with voltage loss at higher voltages. I would never expect to see that kind of a drop out of such a low voltage circuit.
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Old August 20th, 2013, 12:49 AM   #11 (permalink)
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It's Ohm's Law
Voltage drop = resistance of the copper wire x amperage

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Old August 20th, 2013, 08:52 AM   #12 (permalink)
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Quote:
Originally Posted by Harry2 View Post
It's Ohm's Law
Voltage drop = resistance of the copper wire x amperage

Harry
Right, although this early in the morning I'm not sure that's the correct equation. I guess 2 amps is 2 amps even if it's only at 5 volts.
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