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4hv.org :: Forums :: General Science and Electronics
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Notebook battery problems

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Dr. Dark Current
Wed Nov 21 2007, 07:58PM Print
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Any notebook battery masters here? smile I think my NB battery has just crapped on me. Yesterday it worked perfectly fine (after quite some time of no use (staying fully charged)) but today, as the charge indicator was at 95% it suddenly jumped to 6% and after few mins the battery was dead. I recharged it quite a few times, still the same problem. This is odd, how can a battery die from day to day? Is there really no help to it?
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Derek_L
Wed Nov 21 2007, 08:56PM
Derek_L Registered Member #1125 Joined: Fri Nov 16 2007, 09:13PM
Location: Edmonton, Alberta, Canada
Posts: 62
Well you could throw a resistor accross it and measure the voltage.

But seeing as you have charged it and discharged it multiple times already I would be looking on ebay for a replacement battery.
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Mates
Thu Nov 22 2007, 12:30AM
Mates Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
This is excatly the way how the old bateries dye when exposed to freezing conditions (old cars user experience). Is it freezing now in the Czech Rep???

I red some protocols for old Li-pol batteries recovery (high amps and fast discharging - try google) but I do not believe in it anyway...

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Firnagzen
Thu Nov 22 2007, 12:56AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
I remember reading somewhere that Li-poly batteries have a finite life based on time- After 2 years, no matter how you treat them, they will begin to degrade. Apparently keeping them in a fridge helps, but I dunno.

A helpful link: Link2
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Dr. Dark Current
Thu Nov 22 2007, 02:10PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Mates wrote ...

This is excatly the way how the old bateries dye when exposed to freezing conditions (old cars user experience). Is it freezing now in the Czech Rep???

I red some protocols for old Li-pol batteries recovery (high amps and fast discharging - try google) but I do not believe in it anyway...


It's now around 0C or a bit more, but I didn't have my NB out nearly long enough to freeze the battery.

Firnagzen wrote ...

I remember reading somewhere that Li-poly batteries have a finite life based on time- After 2 years, no matter how you treat them, they will begin to degrade. Apparently keeping them in a fridge helps, but I dunno.

A helpful link: Link2

The problem is that it didnt "degrade"- one day it was OK but the next day it was dead.

Is it OK to buy an "OEM" battery? The problem is that original one costs 3x as much as the OEM one.

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Tetrafluoroethane
Thu Nov 22 2007, 02:48PM
Tetrafluoroethane Registered Member #127 Joined: Fri Feb 10 2006, 03:36PM
Location: Cincinnati, OH - USA
Posts: 44
I have never had any problem with non-manufacturer batteries. I have had several notebook batteries die on me and a couple of them died just like you describe.

Usually something in the battery faults (parameter gets too far out of range) that the battery's internal electronics don't like. The electronics then either try to compensate or just shut the battery down altogether. confused
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Derek_L
Thu Nov 22 2007, 03:10PM
Derek_L Registered Member #1125 Joined: Fri Nov 16 2007, 09:13PM
Location: Edmonton, Alberta, Canada
Posts: 62
Only 0c?
Damn Id still be out in my shorts
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Steve Conner
Thu Nov 22 2007, 03:31PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Haha, Canadian, eh? wink

I've never had much trouble with notebook batteries off eBay. They all seem to last for about 2 years, no matter where you got them, and no matter how you treat them...

I have dismantled one that refused to work at all, and it turned out to have a shorted cell. Maybe one of jmartis' cells went short too.
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Bjørn
Thu Nov 22 2007, 06:22PM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Rechargable lithium based batteries does not like to be fully charged and they don't like high temperatures. Those two conditions combined will reduce the lifetime dramatically.

Guess which conditions they commonly experience in notebooks...
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Firnagzen
Fri Nov 23 2007, 01:42AM
Firnagzen Registered Member #567 Joined: Tue Mar 06 2007, 10:55AM
Location: Singapore
Posts: 147
It suddenly failed? Sounds like there's a loose connection. Perhaps some solder joints inside cracked in the cold? (I dunno. I've lived in Singapore most of my life, where the temperature never drops lower than 20 degrees C, so not much cold experience.)

Maybe try opening the battery to have a look? Li-poly batteries contain some circuitry too, you know. Charge/discharge regulators.
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