All About Symbian - Nokia (S60) and Sony Ericsson (UIQ) smartphones unwrapped

  #1  
Old 25-07-2007, 01:33 PM
UnrealTechno UnrealTechno is offline
Registered User
 
Join Date: Feb 2006
Location: Pennsylvania
Posts: 45
UnrealTechno is on a distinguished road
USB Charging

I've seen posts about this, but none with actual answers. How about some thoughts on charging through usb? I picked up a USB to nokia adapter on ebay, but it seems slow (at best) to charge the phone and I've never left it plugged in long enough to get a full charge because I wasn't sure if the over charging circuitry is in the phone, battery, or charger. I also read somewhere that since the USB ports on my MBP are only 500mah, that it will never be able to fully charge the battery.

Is it safe to use this? Will it ever be able to fully charge my phone? Any guidance is appreciated.

edit: other people here have desktops that, if usb charging is safe, i could use. is there a way to find out how many mah the USB ports on windows machine provide?

  #2  
Old 25-07-2007, 01:44 PM
BanziBarn's Avatar
BanziBarn BanziBarn is offline
Registered User
 
Join Date: Apr 2007
Posts: 591
BanziBarn is on a distinguished road
My opinion is that you'll never get a full battery, and if you try charging from a very low batter level you may even get the "not charging" message.

This is my experiance anyway.

  #3  
Old 25-07-2007, 01:54 PM
HoundDog HoundDog is offline
Registered User
 
Join Date: May 2007
Location: London, UK
Posts: 318
HoundDog is on a distinguished road
Quote:
Originally Posted by UnrealTechno View Post
other people here have desktops that, if usb charging is safe, i could use. is there a way to find out how many mah the USB ports on windows machine provide?
I guess using the Nokia CA-100 USB charger should be safe, after all it's made by Nokia. Windows desktops do put out 500mah on each USB port, but it'll need to be an active hub, passive (without it's own power supply) ones only put out 100mah.

  #4  
Old 25-07-2007, 01:57 PM
3Shirts 3Shirts is offline
Registered User
 
Join Date: Apr 2007
Posts: 1,286
3Shirts is on a distinguished road
Quote:
Originally Posted by HoundDog View Post
Windows desktops do put out 500mah on each USB port
Hate to be a pedant but surely the OS installed doesn't affect the power output? I'm sure a linux desktop would output just the same

  #5  
Old 25-07-2007, 01:58 PM
Logan1981 Logan1981 is offline
Registered User
 
Join Date: Apr 2007
Posts: 100
Logan1981 is on a distinguished road
I've got my Nokia CA-100 USB charging cable plugged into a USB extension lead which in turn is plugged straight into the USB on the back of my PC (motherboard built in slot).

Can't say I notice any difference in the charging times between it and the plug charger that came with it.

  #6  
Old 25-07-2007, 02:10 PM
HoundDog HoundDog is offline
Registered User
 
Join Date: May 2007
Location: London, UK
Posts: 318
HoundDog is on a distinguished road
Quote:
Originally Posted by 3Shirts View Post
Hate to be a pedant but surely the OS installed doesn't affect the power output? I'm sure a linux desktop would output just the same
Yeah you're right, should be the same on all systems, it's down to the offical USB specification.

I just mentioned Windows because that's what UnrealTechno was asking about.

  #7  
Old 25-07-2007, 02:30 PM
UnrealTechno UnrealTechno is offline
Registered User
 
Join Date: Feb 2006
Location: Pennsylvania
Posts: 45
UnrealTechno is on a distinguished road
Quote:
Originally Posted by Logan1981 View Post
I've got my Nokia CA-100 USB charging cable plugged into a USB extension lead which in turn is plugged straight into the USB on the back of my PC (motherboard built in slot).

Can't say I notice any difference in the charging times between it and the plug charger that came with it.
Interesting because I've never seen a full charge from USB, but I'm hesitant to leave the phone plugged in for very long. It's not an official Nokia charger, but the Nokia one doesn't have indication that it's more than a change of shape.

I bring the OS into the discussion because I know how to check the power output on a mac, but not a PC. The real difference is the fact that the Windows machine is desktop, but I suppose that since USB is a standard that it will only put out 500 mah anyway.

Hmm, so does anyone think it'll harm the phone or battery to use the adapter?
Ads

  #8  
Old 25-07-2007, 02:42 PM
HoundDog HoundDog is offline
Registered User
 
Join Date: May 2007
Location: London, UK
Posts: 318
HoundDog is on a distinguished road
To be honest, if you were using the Nokia USB charger, I would say it should be fine, but I tend to shy away from certain non Nokia accessories, power supplys and batteries included. So really wouldn't like to say if your one is safe or not.

  #9  
Old 25-07-2007, 02:45 PM
tonymy01 tonymy01 is offline
Registered User
 
Join Date: Jul 2007
Location: Sydney, Australia
Posts: 131
tonymy01 is on a distinguished road
I get the "not charging" unless the battery is nearly full (i.e. pointless!). I have tried this with 2 different laptops and a desktop (using a cheap chinese cable mind you, dunno how/why the Nokia cable would be different unless it had some kind of active components in it, maybe a capacitor to buffer a sudden current hit by the phone?)
I really don't think there will be any damage, the mains plug Nokia power supply doesn't get "feedback" from the phone to alter it's characteristics, it simply can provide a bit more current at 5V than the USB charger cable.

Last edited by tonymy01; 25-07-2007 at 02:49 PM.

  #10  
Old 25-07-2007, 05:51 PM
UnrealTechno UnrealTechno is offline
Registered User
 
Join Date: Feb 2006
Location: Pennsylvania
Posts: 45
UnrealTechno is on a distinguished road
Quote:
Originally Posted by tonymy01 View Post
I get the "not charging" unless the battery is nearly full (i.e. pointless!). I have tried this with 2 different laptops and a desktop (using a cheap chinese cable mind you, dunno how/why the Nokia cable would be different unless it had some kind of active components in it, maybe a capacitor to buffer a sudden current hit by the phone?)
I really don't think there will be any damage, the mains plug Nokia power supply doesn't get "feedback" from the phone to alter it's characteristics, it simply can provide a bit more current at 5V than the USB charger cable.
just what i was thinking, i'll save it for when i'm in a real pinch...i'm also a stickler for using nokia branded accessories

  #11  
Old 25-07-2007, 08:53 PM
pa49 pa49 is offline
Registered User
 
Join Date: Apr 2007
Posts: 400
pa49 is on a distinguished road
Smile

All the intelligence is in the phone! You can use any 5v source as a means of charging as long as the cable fits.
BUT, the Nokia wall charger gives 800Mah and this is needed to charge the phone from or near flat. The problem is that the phone indicators are notoriously inaccurate and you never know what the real state of the battery is and this leads to the second problem if you want to use USB ports to charge the phone.
The USB spec is 500Mah nominal. That means that when tested one at a time the port will be seen to give that figure. But, it's not enough to charge from or near flat as Lithium polymer batteries need that extra oomph to get them started.
Some manufacturers of PCs and laptops realise the problem and as the USB ports can become overloaded they up the spec (this can also be done as has been stated by powered hubs). There's no real way of telling what output USB you have but with a little management you can get round this.
No damage will be done by constant charge of Lithium polymer batteries in fact they like it and their performance should increase with use (to a point!). So my advice is charge it at every opportunity, keep it topped up and your USB port will do the job!
I have seen battery full through USB on my phone, but this has been when fully charged from wall charger and then changed to USB straightaway.
Some 3rd party USB chargers do give 800Mah (Bekin is one). I've had both their car and wall USB charger for some time and they perform really well. I also have a dual charge and sync cable which I use as well as a powerpal single AA battery charger and a 4X AAA battery holder which is brilliant when all other power sources are unavailable. You can use 800 Mah rechargeables which will go from flat!

  #12  
Old 26-07-2007, 12:34 AM
fiddles fiddles is offline
Registered User
 
Join Date: Jul 2007
Location: Norfolk, England
Posts: 81
fiddles is on a distinguished road
Quote:
Originally Posted by pa49 View Post
No damage will be done by constant charge of Lithium polymer batteries in fact they like it and their performance should increase with use (to a point!).
I have always been lead to believe (and i may be wrong ) that any rechargable battery will benefit if from time to time you let it completly discharge. I have always let my phone totally discharge at least once a fortnight

  #13  
Old 26-07-2007, 12:44 AM
tonymy01 tonymy01 is offline
Registered User
 
Join Date: Jul 2007
Location: Sydney, Australia
Posts: 131
tonymy01 is on a distinguished road
Quote:
Originally Posted by fiddles View Post
I have always been lead to believe (and i may be wrong ) that any rechargable battery will benefit if from time to time you let it completly discharge. I have always let my phone totally discharge at least once a fortnight
Wrong technology. NiCd- definitely yes. NiMH- probably yes. LiIon (or Lithium Polymer)- definitely no.
Regards

  #14  
Old 26-07-2007, 07:25 AM
BanziBarn's Avatar
BanziBarn BanziBarn is offline
Registered User
 
Join Date: Apr 2007
Posts: 591
BanziBarn is on a distinguished road
Quote:
Originally Posted by pa49 View Post
Some 3rd party USB chargers do give 800Mah (Bekin is one). I've had both their car and wall USB charger for some time and they perform really well. I also have a dual charge and sync cable which I use as well as a powerpal single AA battery charger and a 4X AAA battery holder which is brilliant when all other power sources are unavailable. You can use 800 Mah rechargeables which will go from flat!
How does the brand of the USB charger make a difference? There's nothing really to them

  #15  
Old 26-07-2007, 07:39 AM
HoundDog HoundDog is offline
Registered User
 
Join Date: May 2007
Location: London, UK
Posts: 318
HoundDog is on a distinguished road
Quote:
Originally Posted by fiddles View Post
I have always been lead to believe (and i may be wrong ) that any rechargable battery will benefit if from time to time you let it completly discharge. I have always let my phone totally discharge at least once a fortnight
I thought this as well, but I've just read the article on Li-Ion batteries on Wikipedia and now agree with tonymy and pa49. I'm gonna plug the phone in a much as poss now and see if it improves the how long the battery lasts.

Quote:
Originally Posted by tonymy01 View Post
Wrong technology. NiCd- definitely yes. NiMH- probably yes. LiIon (or Lithium Polymer)- definitely no.
Regards
Quote:
Originally Posted by pa49 View Post
No damage will be done by constant charge of Lithium polymer batteries in fact they like it and their performance should increase with use (to a point!). So my advice is charge it at every opportunity, keep it topped up and your USB port will do the job!
Here's the article
 

Bookmarks

Tags
charging, usb

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Charging using USB cable used for PC Sync ragr Nokia N95 and N95 8GB 4 09-05-2007 05:46 PM
m600 USB charging panomega Sony Ericsson M600i 3 06-12-2006 10:55 PM
Nokia N73- Charging via USB ? diggango Nokia N71, Nokia N73 and Nokia N75 7 16-11-2006 11:57 AM
USB power surge swaussie Siemens SX1 4 21-06-2005 07:40 PM
Charging N-Gage trough USB DinSubetarn Nokia N-Gage and N-Gage QD 1 05-04-2005 05:33 PM



All times are GMT. The time now is 06:14 AM.


vBulletin skins developed by: eXtremepixels
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Notes || Contact Us || Privacy Policy