Difference in battery life - wall vs computer

srjeffery

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Jun 4, 2008
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#1
Aside from the speed in which the 3G charges when connected to an outlet compared to a computer, has anyone experienced a difference in battery life? I'm beginning to think there may be a difference.
 

dturner

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Dec 15, 2007
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#2
I don't see why there would be, but will be interested to see what others have to say. Just about all of my charging is either through the computer or the car and I am happy with my battery life. But if wall charging makes it better, I am there.:cool:
 

Quake97

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Jul 10, 2007
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Philly Burbs
#3
It may be your not completely charging the iPhone via USB, but you think you are. Do you have any numbers to show your assumption?

Joe
 

srjeffery

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Jun 4, 2008
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#4
i only charge mine once it's below 20%, and always fully charge it. it takes typically less than an hour to fully charge from the wall, and at least 2-3 hrs from my computer. i normally get 24-48 hrs of life, but notice at times getting less than 24 hrs with no noticeably different usage.
 

sl0ppyshat

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Oct 2, 2007
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#5
I have found that my batt. last longer charging via wall. and charges quicker also
 

L.I. Bruce Fan

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#6
I also think it charges faster via wall charger and may last slightly longer that way, but have no data to back that up.
 
Dec 10, 2007
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blacked out
#8
I can see it charging faster with the wall wort.. but power is power, the battery doesn't know or behave differently with regards to it's power source. Just my logical conclusion.. not tested.
 

Dustu2

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Jul 16, 2008
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#9
i only charge mine once it's below 20%, and always fully charge it. it takes typically less than an hour to fully charge from the wall, and at least 2-3 hrs from my computer. i normally get 24-48 hrs of life, but notice at times getting less than 24 hrs with no noticeably different usage.
How often do you use your phone to get battery life like that? Is it a 3G?
 

sl0ppyshat

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Oct 2, 2007
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#11
i will test this starting tomorrow morning. First with the wall charger then comp.

will post screen shots

but everyones phone behaves differently so my test will probably differ from everyone else
 

TJL7386

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Nov 14, 2008
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#12
Also am curious to how you get 24 to 48 hours out of your phone. What are your settings? 3g ... Location on/off ... etc ...

I usually get about 12 to 20 hrs before my phone is almost dead and needs a charge. I keep 3G on and location off. Bluetooth only when I am using my head set.
 

srjeffery

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Jun 4, 2008
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#13
Also am curious to how you get 24 to 48 hours out of your phone. What are your settings? 3g ... Location on/off ... etc ...

I usually get about 12 to 20 hrs before my phone is almost dead and needs a charge. I keep 3G on and location off. Bluetooth only when I am using my head set.
3G on all the time, but on wifi most of the day. location off, bluetooth off. 3-4 hrs usage between browsing, listening to music, talk. i have always let it run down before charging, and always fully recharge. battery life can be sporadic, and there are times when i'm getting less that 24 hrs.
 

JoeT

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Dec 18, 2007
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#14
From a technical perspective, this is kind of like asking if a bucket of water lasts longer if you fill it from the hose rather than the sink.

A battery is little more than a bucket of electricity. You might fill it faster (hose/wall versus sink/computer), and you may empty it faster (3G versus Edge), but one has nothing to do with the other -- UNLESS it can be shown that non-wall charging isn't completely charging the battery -- but since the voltage is the same, that's extremely unlikely.

There's a usage counter in Settings that tracks the amount of usage since the last charge -- a handy tool in case someone wants to give this a real test -- but I don't think you'll find anything statistically interesting.
 

someguy

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Dec 15, 2008
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#15
Not Exactly

From a technical perspective, this is kind of like asking if a bucket of water lasts longer if you fill it from the hose rather than the sink.
Your wall charger is well regulated to push 5Volts at 1Amp. Your USB port will push 5Volts at as low as 100mA depending on your setup (ie. using a USB hub, current draw of other devices using the same bus, etc.)

It's more like your battery is a stretchy balloon, the sink and hose fill at the same rate, but the sink runs a higher water pressure than the hose. So where the hose would eventually stop filling the balloon when the balloon doesn't want to stretch any further, the sink would be able to stretch the balloon more since it can push in water at a higher pressure.

I would expect the battery to last longer when charged off the wall outlet. This depends on your situation however, if you have a USB port that will push 1A with no other peripherals drawing from it, then it will be the same as charging from the wall. It is doubtful that anyone has that situation.

Cheers.
 

FirstIphone

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Dec 8, 2008
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#17
no numbers to back it up but mine seems to last longer with wall charging.

I left it in the wall last night and on my 1 our trip to the office today had it using blue tooth and running Trapster the whole way and the bat still showed full charge when I arrived. I will have to try it but I don't think a pc charge would have netted the same batt result.

BTW...Just to add data to the thread...
3g
blue tooth always on
wi fi always off
medium usage with browser and apps
no music usage
very little video usage (yet)
Normally charge from wall overnight while it is powered down
Battery is still 1/4 to 1/2 charged at end of day.
 

FirstIphone

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Dec 8, 2008
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#19
In the world of RC Cars a slow charged battery will last longer than a fast charged.
So there may be something to the thought of charging slower resulting in a better charge, that in turn will last longer.
 

smknSRT8

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Oct 13, 2007
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#20
i only charge mine once it's below 20%, and always fully charge it. it takes typically less than an hour to fully charge from the wall, and at least 2-3 hrs from my computer. i normally get 24-48 hrs of life, but notice at times getting less than 24 hrs with no noticeably different usage.
There is your problem. You should not let you battery drain down that low every time. Li-ion batteriies only have a certain number of cycles in them, and you are only increases that number. It is a good idea to charge the phone whenever you can, then about once every other week go ahead and let it drain then charge.