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dr_frost_dk is offline dr_frost_dk
2011-03-07 , 14:11
Posts: 1,503 | Thanked: 2,688 times | Joined on Oct 2010 @ Denmark
#311
Originally Posted by Joseph.skb View Post
Hi! I'm using BatteryGraph. Is it normal to see my battery mAh now at around 1214mAh 4187mV? I thought the battery was supposed to be ~1300mAh?

The recent charges have been "degrading" the battery mAh. Is that normal, and how do we preserve the battery performance?
Again the "reported" mAh is controlled by the resistor in the battery circuit, the only way this will change is by temperature.....

So don't worry about it, the mAh test i have made so far is again with equipment not what the phone says.
My new 3044mAh battery is reported to be 1234mAh.
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Tinukedaya is offline Tinukedaya
2011-03-07 , 15:54
Posts: 105 | Thanked: 73 times | Joined on Jan 2011
#312
Originally Posted by dr_frost_dk View Post
well the steps that i have in the meter is controlled by how LiPo & Li-ion battery's discharge/capacity graph is, not saying it is impossible to make the steps you talk about, but making the steps like they are now because they fit as closely as possible to the REAL graph took some hours to make.

The high load is how a battery reacts, my EV moped uses 110A at 22V (under acceleration) and the voltage drops to 19.5V from 22V.
Yeah I know it shows the percentage according to your graphs. I was more like thinking if pictures could not be changed at different time. I would try to do that myself, but I'm really bad at coding... Well. Never mind.. I guess I will just accommodate more to what you made.

Cheers and thanks again.
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handaxe is offline handaxe
2011-03-08 , 19:26
Posts: 1,378 | Thanked: 1,604 times | Joined on Jun 2010 @ Göteborg, Sweden
#313
How reproducable?

@dr_frost_dk: the non-nokia battery results - and in particular the few good 'uns - how reproducible are the results from new battery to battery? In other words, what are the chances of picking up a dud even if the make often tests well?

Likely you don't have the data but any anecdotal evidence?

tnx

PS ... and the very next post I read was this http://talk.maemo.org/showpost.php?p...&postcount=282. An answer is there. Both scuds tested well.....

And the post in this thread reporting same: http://talk.maemo.org/showpost.php?p...&postcount=280
Last edited by handaxe; 2011-03-08 at 19:38.
 
geneven is offline geneven
2011-03-08 , 19:56
Posts: 5,795 | Thanked: 3,151 times | Joined on Feb 2007 @ Agoura Hills Calif
#314
I hope no one objects to my poaching on this thread.

Here's an interesting battery report. I have seen many, many claims here about exploding batteries. These are almost always directed at cheap third-party batteries and how dangerous they are. The exploding battery is always a report -- the person it happened to is never the poster. Since I have used non-Nokia batteries for years, going back to my N800, with no problems, it always irritates me. The dangers are quite small.

However, I finally ran into a credible account of an explosion in a customer comment on Dealextreme. Here it is:

"Used this in my car that has got a fully working 24V system. I bought two of these but both blew up after charging the original Nokia N900 battery. I had it connected for about one minute when I heard I surprisingly loud boom and then I smelled the smoke."

So here we have a credible explosion report on the N900. But, as you will have noted -- it is with the original N900 battery! However, I guess it was the charger that blew up, not the battery.
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dr_frost_dk is offline dr_frost_dk
2011-03-08 , 20:11
Posts: 1,503 | Thanked: 2,688 times | Joined on Oct 2010 @ Denmark
#315
Originally Posted by geneven View Post
I hope no one objects to my poaching on this thread.

Here's an interesting battery report. I have seen many, many claims here about exploding batteries. These are almost always directed at cheap third-party batteries and how dangerous they are. The exploding battery is always a report -- the person it happened to is never the poster. Since I have used non-Nokia batteries for years, going back to my N800, with no problems, it always irritates me. The dangers are quite small.

However, I finally ran into a credible account of an explosion in a customer comment on Dealextreme. Here it is:

"Used this in my car that has got a fully working 24V system. I bought two of these but both blew up after charging the original Nokia N900 battery. I had it connected for about one minute when I heard I surprisingly loud boom and then I smelled the smoke."

So here we have a credible explosion report on the N900. But, as you will have noted -- it is with the original N900 battery! However, I guess it was the charger that blew up, not the battery.
Yes sounds like the charger to me also.
I as i have stated before have a few hundred LiPo, Li-ion and so on laying around (seriously not jocking here), and in my time i have never witnessed a blowout, as far as i know this happened most in the early years of lithium battery history
The only thing i have seen is some of my crappy cheap LiPo puffing out.
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Battery Tests and Battery Mod / Homemade 3000mAh XL Battery - (DONATE)
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stlpaul is offline stlpaul
2011-03-08 , 20:41
Posts: 1,141 | Thanked: 781 times | Joined on Dec 2009 @ Magical Unicorn Land
#316
Originally Posted by dr_frost_dk View Post
Ok why the H**l do people still think freezing battery's keeps them "fresh", i use my LiPo and Liion battery's for EV's more then phone's, cameras etc, and i can tell you that doing this cold season i one day thought that the temperature was good but it was too cold and the result was that my Electric Moped (Also homemade) lost about 10-15% capacity because of the cold temperature (not very isolated battery case)
When I was a kid my neighbour would put his NES games in the freezer because he thought it made them more reliable (actually caused by dirty/worn contacts on the socket).

The same guy used to think that tapping your finger 3 times on a can of Coca-Cola will prevent it from exploding when you open it.

Some people like to find a "secret knowledge" in any circumstances.

For batteries, my experience is same as yours, I know 2 people who left their phone in the car overnight during sub-zero temperatures, and their battery life was not good after that. It seems like the cold really has a negative effect on them. Too bad their had an iPhone and can't change the battery.
 

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handaxe is offline handaxe
2011-03-08 , 22:16
Posts: 1,378 | Thanked: 1,604 times | Joined on Jun 2010 @ Göteborg, Sweden
#317
Originally Posted by dr_frost_dk View Post
The only thing i have seen is some of my crappy cheap LiPo puffing out.
I have had 2 Sony Ericsson provided batteries do the puffy-out number. One in a dormant cellphone that puffed up enough to displace the battery cover. I admit to handling them gingerly on the way to recycling....
 
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dr_frost_dk is offline dr_frost_dk
2011-03-08 , 22:30
Posts: 1,503 | Thanked: 2,688 times | Joined on Oct 2010 @ Denmark
#318
Originally Posted by handaxe View Post
I have had 2 Sony Ericsson provided batteries do the puffy-out number. One in a dormant cellphone that puffed up enough to displace the battery cover. I admit to handling them gingerly on the way to recycling....
another iphone bashing, hehe
battery puffing in the iphone causes the thing to self destruct since there is no battery cover and the battery puffing crushes the iphone from the inside, and the missing battery circuit in the iphone does not help here.......
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N900 @ 850MHz (LV) & 3044mAh Battery
Battery Tests and Battery Mod / Homemade 3000mAh XL Battery - (DONATE)
Custom Brightness & No Light Sensor
N900 DIY Micro Amplifier, turn your N900 into a home stereo
Fix you USB before and after it breaks
Feel free to contact me through PM, Skype or G.Talk
Last edited by dr_frost_dk; 2011-03-08 at 22:59.
 
handaxe is offline handaxe
2011-03-08 , 22:34
Posts: 1,378 | Thanked: 1,604 times | Joined on Jun 2010 @ Göteborg, Sweden
#319
Originally Posted by dr_frost_dk View Post
battery puffing in the iphone causes the thing to selfdestruct since there is no battery cover and the battery puffing crushes the iphone from the inside, and the missing battery circuit in the iphone does not help here.......
Trojan batteries.... interesting.
 
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pedrocoba is offline pedrocoba
2011-03-09 , 09:40
Posts: 118 | Thanked: 7 times | Joined on Jan 2011 @ indonesia
#320
Too extreme for me to do yourself at home?
If there is I want to buy a ready-made from the experiment.thx
 
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