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-   -   N95 not charging through USB - WHY ? (http://www.allaboutsymbian.com/forum/showthread.php?t=63862)

ash213 17-08-2007 06:55 PM

N95 not charging through USB - WHY ?
 
Phone is connected through USB, charging hasnt started - what am i doing wrong ?

superswede 17-08-2007 07:00 PM

...because it's not chargable through USB...

ash213 17-08-2007 07:03 PM

Your joking mate ???

surely that is an important feature to charge through USB !!!!
ARGHHH!!!!!!!!!!!!

chriswatts 17-08-2007 07:52 PM

Yes, that's why nokia produce the CA-100 usb charging cable

superswede 17-08-2007 07:53 PM

There is however a Nokia charger which let u use usb on pc to charge phone (not PC USB->N95 mini-USB but PC USB->N95 2mm port) =>
Nokia Charger via USB port CA-100

madasscivic 17-08-2007 08:04 PM

It will charge via a usb port but only trickle or topup charge and only if your phone is not totally discharged as your mains chargers output is approx 7v and the usb port is approx 5v at least this is what i found out with my usb charger.

superswede 17-08-2007 08:19 PM

Quote:

Originally Posted by madasscivic (Post 334163)
It will charge via a usb port but only trickle or topup charge and only if your phone is not totally discharged as your mains chargers output is approx 7v and the usb port is approx 5v at least this is what i found out with my usb charger.

This is the CA-100 charger?

madasscivic 17-08-2007 08:30 PM

yes it is the same as i use and it will not charge my phone once the battery is dead only from about three quarters full .

nudda 17-08-2007 08:59 PM

usb is slowest
car charger slightly faster
mains is fastest

i bought this

http://cgi.ebay.co.uk/Brand-New-USB-...QQcmdZViewItem

and its the best thing ive bought from ebay ... and a bargain !

Pheonix SZ 18-08-2007 07:31 AM

Mine'll charge from empty to full on USB - including via a 4 x AA Boxwave USB charger.

pa49 20-08-2007 09:58 AM

Quote:

Originally Posted by madasscivic (Post 334163)
It will charge via a usb port but only trickle or topup charge and only if your phone is not totally discharged as your mains chargers output is approx 7v and the usb port is approx 5v at least this is what i found out with my usb charger.

Nothing to do with voltage!
It's because USB port specs set a 500mA nominal rating and the Nokia mains charger is 800mA.
The lithium ion battery needs the extra ooomph to get them started from discharged state.
Some PC and laptop manufacturers do supply more from the USB port but it's the luck of the draw.
Simply answer is keep the battery on charge whenever possible. (USB, car, external power pack or mains).
Your battery will thank you for it!

docpaul 23-08-2007 10:26 PM

also incorrect
 
Nothing to do with current either!

Simple logic, if it was then how does the C-100 cable work?
The USB port can supply enough current to charge, just not as much as the mains charger.
I assume it was a choice by Nokia, either a hardware or firmware limitation. lets hope it's a firmware issue and therefore can be "fixed".

DP

pa49 24-08-2007 03:42 AM

Quote:

Originally Posted by docpaul (Post 335383)
Nothing to do with current either!

Simple logic, if it was then how does the C-100 cable work?
The USB port can supply enough current to charge, just not as much as the mains charger.
I assume it was a choice by Nokia, either a hardware or firmware limitation. lets hope it's a firmware issue and therefore can be "fixed".

DP

Sorry, don't understand your 'logic'
Lithium Ion batteries charge rate is dependent on the current supplied to it at a certain voltage. The voltage is monitored by the charge circuits and the applied current is what provides the battery with the stored charge at a final voltage. The current can vary with the same voltage. The higher current of the mains charger is what allows the battery to be charged from dead where charging from the USB port provides a lower current that will not start the charge cycle.
Charging a battery is everything to do with current. The end result is a stored charge (max current available to a device) at a certain potential difference (voltage). On discharge the voltage is maintained while the current available drops. (the opposite of charging).
I don't understand what you mean about the C-100. It's just a piece of wire and as such has nothing (actually little) to do with any current or voltage! It works because it is simply a method of transmission of the current and voltage between the USB port and the power connector of the phone in a passive mode.
Whatever Nokia chose they can't change electrical physics by changeing firmware!

gerrit 12-09-2007 02:28 PM

Not Charging From Car Charger!
 
Hi All,

I can take this a step further I bought a Car Charger for my N95 and now find the phone says "Not Charging" Saddly I bought it from a shop that is to far away now to bother returning it.

But there does seem to be an issue with chargers?

Any advise?

Gerrit

waxup 12-09-2007 02:36 PM

You cannot charge your Nokia N95 through the mini USB port on the phone itself. You can use USB from your PC to the power adapter of the N95 to power the battery. Aftermarket chargers may not charge a battery from a dead state and they may not fully charge the battery to a full battery state. This is because of the mah ratings of the aftermarket chargers being 500mah and the Nokia needing 800mah to initiate charging on a drained battery.


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