android
  #1  
Old 02-27-2012, 01:28 PM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default Cowon J3 battery problem - please help!

I received my new J3 today. I have no reason to think that it is anything other than brand new, as the retail packaging seemed unopened and the factory screen protector film was mint.

I charged it for the recommended 3.5 hours this afternoon, as per the user manual. In fact, I charged it for 5 hours. I knew it was charging because the icon appeared on screen and the I was using a reliable USB charger plug.

Immediately upon disconnecting the J3 from the charger, I then begin using it for the first time.

But within 10 minutes, I was told that the battery was low and the unit then switched itself off automatically. It did this several times consecutively until it then refused too switch on.

Incidentally, when is turn the J3 on the battery icon at the top displays that it is full. Within 30 seconds the icon then changes to empty.

What on earth could be the problem with this brand new J3?
Reply With Quote

Advertisement [Remove Advertisement]

  #2  
Old 02-27-2012, 01:33 PM
musichound musichound is offline
Off-Topic Moderator
 
Join Date: Jun 2007
Location: Staten Island, NYC
Posts: 2,055
Default

Seems to be it's battery related. When you plugged in the USB cable, did you make sure it was inserted correctly? There are known instances where people think the cable is plugged in properly, only to find out that extra force is needed for a proper insert.
__________________
Cowon X7 160GB - iRiver H320 - IPod Classic 160GB - iPod 5.5G 80GB - Sansa Clip Plus 4GB - Original Sansa Clip 2GB
Reply With Quote

  #3  
Old 02-27-2012, 01:37 PM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default

Good point - I did encounter that stiff connection problem with the proprietary USB cable. But I overcame it and made sure it was firmly connected. Thanks for the suggestion though.

Any other ideas?
Reply With Quote

  #4  
Old 02-27-2012, 02:30 PM
musichound musichound is offline
Off-Topic Moderator
 
Join Date: Jun 2007
Location: Staten Island, NYC
Posts: 2,055
Default

Quote:
Originally Posted by Pipps View Post
Good point - I did encounter that stiff connection problem with the proprietary USB cable. But I overcame it and made sure it was firmly connected. Thanks for the suggestion though.

Any other ideas?
The only other thing I can think of is that maybe it needs to be charged/discharged several times for proper operation. Other than that, it's most probably a bad battery.
__________________
Cowon X7 160GB - iRiver H320 - IPod Classic 160GB - iPod 5.5G 80GB - Sansa Clip Plus 4GB - Original Sansa Clip 2GB
Reply With Quote

  #5  
Old 02-27-2012, 02:35 PM
WalkGood's Avatar
WalkGood WalkGood is offline
Moderator
 
Join Date: Aug 2006
Location: FL
Posts: 12,579
Default

If it does turn out to be a bad battery, it's good to know that you can always get Cowon to replace it in the first year (in the USA). Outside of USA many countries have up to 2 years warranty.
__________________
WalkGood,
Ramón

abi >> | Forum Rules | Glossary | Why Rockbox | FLAC or MP3? | irc
Reply With Quote

  #6  
Old 02-27-2012, 04:31 PM
DSperber DSperber is offline
Senior Member
 
Join Date: Jun 2010
Location: Marina Del Rey, CA
Posts: 695
Default

The battery charge icon... did it show FULL or is it essentially "empty"?

There's a large icon available on the Smart Widget desktop, but the system information bar at the top of the screen (e.g. when playing music) always has a tiny version of that icon.

What does it show?
Reply With Quote

  #7  
Old 02-29-2012, 02:42 AM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default

The smart desktop battery meter widget is essentially empty.

The same problem happened again this morning. The J3 turned itself off due to a reported 'low battery' after only 5 hours of play following a 3.5hr AC charge.

I immediately switched the J3 back on, and the battery meter contradictorily displayed itself as full again. It has since continued playing for another hour now - despite the battery meter now perpetually showing as empty again.

What could this problem be, and is it likely to get better with time?
Reply With Quote

  #8  
Old 02-29-2012, 11:06 AM
meanwhile meanwhile is offline
Member
 
Join Date: Aug 2011
Posts: 128
Default

Quote:
Originally Posted by Pipps View Post
The smart desktop battery meter widget is essentially empty.

The same problem happened again this morning. The J3 turned itself off due to a reported 'low battery' after only 5 hours of play following a 3.5hr AC charge.

I immediately switched the J3 back on, and the battery meter contradictorily displayed itself as full again. It has since continued playing for another hour now - despite the battery meter now perpetually showing as empty again.

What could this problem be, and is it likely to get better with time?
I wouldn't expect a more exact diagnosis than you've had from people who have never seen your player, let alone dismantled it and gone over it with test equipment. (Obvious possibilities are the battery and the charging circuitry.)

**Assuming that you tried the obvious thing of giving it an overnight charge before using it** (I think this is recommended in the manual) then: it's new and isn't working properly - return it.

Oh - and if you're charging via usb hub, plug directly into the computer - your hub might not be delivering adequate current.
Reply With Quote

  #9  
Old 03-02-2012, 06:54 AM
ThingMan's Avatar
ThingMan ThingMan is offline
Junior Member
 
Join Date: Jan 2011
Location: The Netherlands
Posts: 5
Lightbulb

Quote:
Originally Posted by meanwhile View Post
Oh - and if you're charging via usb hub, plug directly into the computer - your hub might not be delivering adequate current.
Yep, can confirm that too, even when connected to a root-usb on my laptop! However, it charges correctly when connected to my normal PC's root-usb...

There may also be a problem with a laptop or pc that goes into standby. In such cases my J3 would still report it's being charged, but when disconnected after hours of this so-called 'charging', the battery symbol soon collapses.

I've also bought a separate 240V-to-USB charger (doesn't need to be a Cowon device and will be very cheap) and that certainly works fine.

Good luck!
__________________
"It is not length of life, but depth of life."
R.W.Emerson

Last edited by ThingMan; 03-02-2012 at 06:59 AM.
Reply With Quote

  #10  
Old 03-02-2012, 04:39 PM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default

It seems you both failed to notice that I charge by AC. Thanks for your good intentions anyway.
Reply With Quote

  #11  
Old 03-03-2012, 06:08 AM
ThingMan's Avatar
ThingMan ThingMan is offline
Junior Member
 
Join Date: Jan 2011
Location: The Netherlands
Posts: 5
Default

Quote:
Originally Posted by Pipps View Post
It seems you both failed to notice that I charge by AC. Thanks for your good intentions anyway.
A thousand excuses! You are absolutely right about not noticing you charge by AC...

Nevertheless, we write for all who read and may experience similar problems.
__________________
"It is not length of life, but depth of life."
R.W.Emerson
Reply With Quote

  #12  
Old 03-04-2012, 04:45 AM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default

It seems that I am not the only one who has experienced problems with the J3's battery life.

It is beginning to hold up better now after it's third overnight AC charge from empty.

I will report back again soon...
Reply With Quote

  #13  
Old 03-09-2012, 02:19 AM
lyu0001 lyu0001 is offline
Junior Member
 
Join Date: Feb 2012
Posts: 2
Default

My problem is that the battery showed "full", however shutdown automatically.
Reply With Quote

  #14  
Old 03-09-2012, 12:34 PM
afraaa's Avatar
afraaa afraaa is offline
Junior Member
 
Join Date: Oct 2010
Posts: 24
Default

just dont know why ppl didnt know that they should charge j3 with ac adaptor for 8 hour first time to reach great battery life

USE AC CHARGER .. NOT USB i tested it

i made mistake on my zen x-fi 2 and didnt made it again in j3 , and now i charged it and using it like 3 day
Reply With Quote

  #15  
Old 03-09-2012, 12:42 PM
afraaa's Avatar
afraaa afraaa is offline
Junior Member
 
Join Date: Oct 2010
Posts: 24
Default

and do first charge three time and dont connect it to computer , use sd card to listen music

after 3 time charge(for 8 hour ) and de charge your have better battery , trust me , i know cuz i tested it
Reply With Quote

  #16  
Old 03-11-2012, 05:30 PM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default

This problem gets even stranger...

I give the J3 its fifth full overnight charge, after week-long playback from its fourth charge. (So far, so good.)

Upon waking up in the morning, I switch on the fully charged J3. Within 15 seconds of being switched on, I receive the 'Battery Empty' message, and it turns itself off.

So I wait until the evening and charge it overnight again for the sixth time. The next morning, I turn it on and it works OK.

I know what you're probably thinking - he didn't actually charge it on the fifth overnight charge. Well, I did. The USB cable was fully plugged-in, and I checked to make sure that the 'Battery Charging' message was displayed before I went to bed.

So there is something very strange going on with the battery of my 32GB J3.

Does anyone have any ideas?
Reply With Quote

  #17  
Old 06-05-2012, 02:45 PM
sompie sompie is offline
Junior Member
 
Join Date: Oct 2007
Posts: 6
Default

I noticed if you let the cable in when starting up the J3 thinks he is empty and shutsdown. So the cable still inside the MP3-player but out of the charger
Reply With Quote

  #18  
Old 06-05-2012, 06:30 PM
Pipps's Avatar
Pipps Pipps is offline
Junior Member
 
Join Date: Mar 2010
Posts: 32
Default

I have an update.

I returned this J3 to the retailer. I obtained a refund.

I bought a brand new J3 from a supplier in my own country. It was shipped with the latest firmware already installed.

This new J3 has worked perfectly since day-one.

No further problems to report.

Thank you.
Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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



All times are GMT -5. The time now is 03:47 PM.