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kingoddball is offline kingoddball
2010-05-21 , 02:07
Posts: 1,187 | Thanked: 816 times | Joined on Apr 2010 @ Australia
#21
I have the same issue.
Cheap batteries. I got 2 or $13 with a desktop charger.

Best solution for this is if you're going to have a heavy power day (using GPS/3G/gaming and just smashing your battery) use the cheapo crap battery for a few hours then swap to the original Nokia battery when you know the batter should be running low.
 
geneven is offline geneven
2010-05-21 , 02:45
Posts: 5,795 | Thanked: 3,151 times | Joined on Feb 2007 @ Agoura Hills Calif
#22
Originally Posted by cyeung View Post

With a cheap battery, I would not be surprised that the protection circuitry is the first thing they cheap out on.
I think that what they cheap out on in Hong Kong, where legitimate batteries often come from, is using the exact plans of the originating manufacturer without giving the originating manufacturer his cut.

As an EE, what do you think Nokia pays for an extra battery after the first thousand? Say, for example, the cost of 1001 batteries minus the cost of 1000 batteries?
 
stephenh is offline stephenh
2010-05-21 , 06:23
Posts: 12 | Thanked: 1 time | Joined on May 2010 @ Malaysia
#23
happened to me as well. but it was from 80% to 0% in less than 2minutes.
 
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ossipena is offline ossipena
2010-05-21 , 06:39
Posts: 3,159 | Thanked: 2,023 times | Joined on Feb 2008 @ Finland
#24
Originally Posted by pantera1989 View Post
My primary source is 2 guys that repair cellphones. And the extra fake battery I bought for my N95 did this too. Anyways here's a review:



Source: http://www.amazon.co.uk/Nokia-BL-5J-.../dp/B001O5ES0S

Don't believe me if you don't want to. But the facts are there. And this has nothing to do with how much the battery lasts. I am very happy with that. The battery rarely dies on me, so I rarely use the fake one and keep it only as an extra. But the issue here is that the battery doesn't show the correct percentage. I told you why. Somehoe it is BS..

Buy a fake battery just for the kicks. I got mine for 6 euros. You will see what happens.
sorry, I've read too much about lithium ion technology. and I see no real facts there.
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ossipena is offline ossipena
2010-05-21 , 06:40
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#25
Originally Posted by Cue View Post
I see thanks for the info.
can I ask how it messes things up, what is misread?
I can understand that the percentage can be wrong if it assumes the wrong maximum charge based on a previous battery but surely this should not have this effect on the rate at which it loses charge. zero will still be zero and anything inbetween should just be the same, right? even if we assume that the battery drains faster shouldn't the second derivative still be almost the same? why does it drop like this?

Gabby Just to be clear it rapidly hit zero before I changed my battery, not during the change. it didn't take me an hour to change it :P
it is all about the voltage. you measure the voltage and calculate percentage from that. only problem that the voltage is not linear, specially near 0% (e: note 0% charge, means 100% discharge below)


e: and different cells have at least a little different curves. I quess with cheapos the last drop is significantly bigger.

and N900 most probably calibrates the battery voltage readings etc. at least there are numerous reports that full discharge plus loading to full couple times makes battery last longer, aka the percentage is calibrated better.
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Last edited by ossipena; 2010-05-21 at 06:52.
 

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ossipena is offline ossipena
2010-05-21 , 06:44
Posts: 3,159 | Thanked: 2,023 times | Joined on Feb 2008 @ Finland
#26
Originally Posted by geneven View Post
I think that what they cheap out on in Hong Kong, where legitimate batteries often come from, is using the exact plans of the originating manufacturer without giving the originating manufacturer his cut.

As an EE, what do you think Nokia pays for an extra battery after the first thousand? Say, for example, the cost of 1001 batteries minus the cost of 1000 batteries?
they cut costs by

1) stripping security chips and probably some structural designs that prevents explosions etc if those are costly to manufacture

2) use cells that have been affirmed defective for the original $50 battery. (and picked from trash just to make cheap batteries)

3) use probably the same factories, molds etc (aka running "black shifts" at the official factory)
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ossipena is offline ossipena
2010-05-21 , 06:48
Posts: 3,159 | Thanked: 2,023 times | Joined on Feb 2008 @ Finland
#27
Originally Posted by cyeung View Post
I am an EE with a background in power systems engineering, and I call NOT BS on what pantera said. The lithium-ion battery chemistry does not take abuse (overloading, overdischarge, under-voltage, charging too fast, out of temperature bounds) very well. These conditions damage the cell, and the battery fails quite violently. The protection circuitry is there to turn off the battery if it notices the conditions before damage occurs.

With a cheap battery, I would not be surprised that the protection circuitry is the first thing they cheap out on.
I was referring to proper percentage, protection part is true.
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9000 is offline 9000
2010-05-21 , 08:40
Posts: 1,425 | Thanked: 983 times | Joined on May 2010 @ Hong Kong
#28
Originally Posted by jeweladdict View Post
Both times I am at a customer site using their wifi to surf the internet. All of a sudden battery low, and a second later, battery dead. Is the battery truly dead? I try to power on after the phone dies, but it just dies again until I charge it some...
It seems to me that this battery is intentionally designed to return fake battery power level. Thus when it really runs out it drops radically.

If it's an authentic Nokia battery, it's still a chance that it's an OEM battery with Nokia sticker.

In this connection, can you provide us the brand name of this battery for our further investigation? Better yet, screenshots of the battery labels front and upside down.
 
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Naranek is offline Naranek
2010-05-21 , 10:10
Posts: 236 | Thanked: 149 times | Joined on Jul 2007 @ Finland
#29
I've had a similar behavior with an original battery that was just at the end of it's life. It was I think two to three years old. Replacing it with a new original Nokia battery solved the problem. The faulty battery caused a lot of crashes too.
 
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cazzajay is offline cazzajay
2010-05-21 , 15:24
Posts: 61 | Thanked: 12 times | Joined on Mar 2010 @ Manchester, United Kingdom
#30
RE that link given earlier in the forum

http://www.nokia.com/NOKIA_COM_1/Abo...nal_screen.pdf

I didn't realise these batteries had built in fuses. That means a battery could brick itself if it is shorted briefly?
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