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#1 +techbeck

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Posted 25 July 2013 - 17:41

So I bought a low profile USB adapter that plugs in to my cigarette lighter.  I also bought a cheap retractable USB cord to charge my phone.  Problem I am having is when I use my GPS and have my phone plugged in, I am losing battery life.  Is this normal or is it be cause of my cheap cable?  I have not tried a normal cord, keep forgetting, but I do notice that even when my phone is idle, it doesnt charge as fast as say when it is plugged in to my PC.

 

Thanks




#2 guitmz

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Posted 25 July 2013 - 17:44

hmmm i have a usb car charger (cheap as well) and never had any problems with gnex and nexus 4 :/



#3 tsupersonic

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Posted 25 July 2013 - 17:44

Is it a 1 amp or greater charger? It sounds like it's not getting enough power 



#4 OP +techbeck

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Posted 25 July 2013 - 18:22

Is it a 1 amp or greater charger? It sounds like it's not getting enough power 

 

This is what I bought....

 

http://www.amazon.co...0?ie=UTF8&psc=1

http://www.amazon.co...0?ie=UTF8&psc=1



#5 shozilla

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Posted 25 July 2013 - 18:29

You can not charge your phone while GPS is running if you are using it as GPS navigation.  Because GPS is draining the battery.

 

Turn the GPS off and plug it in and see.

 

That's the reason I bought stand-alone GPS .... not on my phone.

 

I tried once before.. my phone with GPS on while it's plugged, it gets hot.



#6 Draconian Guppy

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Posted 25 July 2013 - 18:32

Amps amps amps

 

Probably like tsupersonic says, not enough power to feed the draining battery. What does the charger that came with your device say? (volts and amps)



#7 OP +techbeck

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Posted 25 July 2013 - 18:43

You can not charge your phone while GPS is running if you are using it as GPS navigation.  Because GPS is draining the battery.

 

Turn the GPS off and plug it in and see.

 

That's the reason I bought stand-alone GPS .... not on my phone.

 

I tried once before.. my phone with GPS on while it's plugged, it gets hot.

 

Odd since I can talk on my phone while it is plugged in to the wall charger and it charges the battery.  I don't use the GPS for long trips (no longer than a 2hr drive) so its more of an annoyance than anything.  And it charged the battery, just slower than plugging it in to my PC.

 

Amps amps amps

 

Probably like tsupersonic says, not enough power to feed the draining battery. What does the charger that came with your device say? (volts and amps)

 

Adapter is 12v.  Cable says USB 2.0 high speed but doesnt list much specs.  I posted links above.



#8 Draconian Guppy

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Posted 25 July 2013 - 18:49

Odd since I can talk on my phone while it is plugged in to the wall charger and it charges the battery.  I don't use the GPS for long trips (no longer than a 2hr drive) so its more of an annoyance than anything.  And it charged the battery, just slower than plugging it in to my PC.

 

 

Adapter is 12v.  Cable says USB 2.0 high speed but doesnt list much specs.  I posted links above.

My point exactly, I meant your wall charger that came with your device is probably rated for more amps than the one you bought.



#9 shozilla

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Posted 25 July 2013 - 18:49

Odd since I can talk on my phone while it is plugged in to the wall charger and it charges the battery.  I don't use the GPS for long trips (no longer than a 2hr drive) so its more of an annoyance than anything.  And it charged the battery, just slower than plugging it in to my PC.

 

 

Adapter is 12v.  Cable says USB 2.0 high speed but doesnt list much specs.  I posted links above.

 

Talk on phone while it's plugged.. it's fine... that is because it is not using GPS while you are talking. 

 

I was talking about GPS on while you are using it as GPS Navigation app...  it gets hot on my phone if I use it as GPS navigation.



#10 OP +techbeck

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Posted 25 July 2013 - 18:53

My point exactly, I meant your wall charger that came with your device is probably rated for more amps than the one you bought.

 

Then how much power does a USB 2.0 port pull from a PC?

 

I think it is what 5v? 

 

Never mind...it is 5v from a PC USB port.  So I got a 12v adapter charger slower than a 5v.  So possible the cheap cable I am using?



#11 Draconian Guppy

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Posted 25 July 2013 - 18:55

Talk on phone while it's plugged.. it's fine... that is because it is not using GPS while you are talking. 

 

I was talking about GPS on while you are using it as GPS Navigation app...  it gets hot on my phone if I use it as GPS navigation.

Isn't "hot" normal behavior though?

Then how much power does a USB 2.0 port pull from a PC?

 

I think it is what 5v? 

It's no the voltage, but the amps, IIRC 2.0 is 0.5 amps,  i'm guessing your wall charger throughput is 5 amps.



#12 OP +techbeck

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Posted 25 July 2013 - 18:58

Isn't "hot" normal behavior though?

It's no the voltage, but the amps, IIRC 2.0 is 0.5 amps,  i'm guessing your wall charger throughput is 5 amps.

 

i looked it up.  USB 2.0 port is 5v, the adapter I am using in the car is 12v.  The car charges  slower.  So I am thinking maybe it is the cheap cable I am using.  Or else I am way off....I am not an electrician


Talk on phone while it's plugged.. it's fine... that is because it is not using GPS while you are talking. 

 

I was talking about GPS on while you are using it as GPS Navigation app...  it gets hot on my phone if I use it as GPS navigation.

 

Not charging on while GPS is fine...just want to get it to charge as fast as when it is plugged into my pc...if possible.



#13 shozilla

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Posted 25 July 2013 - 19:00

Isn't "hot" normal behavior though?

 

No.. it is hot as the stove. Burn your finger.. I unplugged out of the lighter then wait for it to cool it off the pick it up.. If I didn't plug it out in time, it may start a fire or get destroyed.



#14 OP +techbeck

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Posted 25 July 2013 - 19:01

No.. it is hot as the stove. Burn your finger.. I unplugged out of the lighter then wait for it to cool it off the pick it up.. If I didn't plug it out in time, it may start a fire or get destroyed.

 

Mine gets warm at the top/back of the phone...but not that hot.



#15 Draconian Guppy

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Posted 25 July 2013 - 19:05

i looked it up.  USB 2.0 port is 5v, the adapter I am using in the car is 12v.  The car charges  slower.  So I am thinking maybe it is the cheap cable I am using.  Or else I am way off....I am not an electrician


 

Not charging on while GPS is fine...just want to get it to charge as fast as when it is plugged into my pc...if possible.

it's NOT VOLTAGE, its AMPERAGE  you can have 12v and only have 0.5 amps just as you can 5v and have 5 amps.  See the back of the charger that CAME with your device so you can see what i'm talking about.

 

No.. it is hot as the stove. Burn your finger.. I unplugged out of the lighter then wait for it to cool it off the pick it up.. If I didn't plug it out in time, it may start a fire or get destroyed.

you are talking  about the charger?


here's a good analogy, say the wire is a road, the battery a bread factory and the light a super market, the current would therefore be the rate at which the vans leave the factory, and the voltage would be the amount of bread their carrying (the energy). so amps are the rate at which energy is moved and volts are the actual level or intensity of that energy. 

Another analogy - You have a big vat full of water. At the bottom is a valve that is closed. The water represents a potential to do work or the voltage. As you open the valve a little bit some water flows out. This represents current. How much the valve is open represents resistance - the smaller the opening the greater the resistance. Now if you had a water wheel near the valve and the outflow of the vat caused the wheel to turn; and if the wheel were connected to a generator you would have a miniature hydroelectric system and could get some work done.

 

 

http://www.wisegeek....lt-and-watt.htm





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