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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   Battery consumption analysis (https://talk.maemo.org/showthread.php?t=43748)

H3llb0und 2010-02-11 00:14
Re: Battery consumption analysis
 
I have been charging my N900 at work with the provided USB cable, and it charges very slowly, but I have been noticing that the battery is lasting a lot longer.

Last time I fully charged it was on Tuesday at around 1:00 PM

It is now 11:15 AM of Thursday and I still have 15% Battery left :D

I have been using it mostly for lots of sms, and maybe 5/6 calls per day.
Playing Angry Birds and Blocks when commuting from home to work and vice versa. So that's at least 2h playing time every day.

medri 2010-02-11 01:51
Re: Battery consumption analysis
 
Quote:
Originally Posted by jamiefuller (Post 520408)
Re the slower charging chargers,

I think the real difference comes from the fact that your phone is probably finished charging nearer morning, the n900 seems to charge from ac and then stop, so if I charge mine at 11pm, and its full by 1am. then it sits on my desk depleting battery until I get up 6-8 hours later.

if your charge doesn't finish charging till say 4 or 5 in the morning you'd automatically be getting 3 or 4 extra hours of standby power.

So i'm swapping to a slower charge for my overnight charges too :)
It's hard for me to imagine it this way. I won't say it is not true, but I doubt it.
I could think of a miscalculating with the fast charging. And so it assumes that you havea full battery even if you don't ...
But this is just a guess too ...

[Edit:]
But I'll try it with my N95-charger and post some results!

shadowjk 2010-02-11 02:15
Re: Battery consumption analysis
 
It's bad for the health of Li-Ion batteries to be kept fully charged constantly. The charging is switched off when battery is full. It resumes charging at some threshold (maybe 85percent?) and charges to something like 90-95 again.

These numbers are probably not accurate at all, but you get the idea.

kaz911 2010-02-11 07:02
Re: Battery consumption analysis
 
Quote:
Originally Posted by shadowjk (Post 520551)
It's bad for the health of Li-Ion batteries to be kept fully charged constantly. The charging is switched off when battery is full. It resumes charging at some threshold (maybe 85percent?) and charges to something like 90-95 again.

These numbers are probably not accurate at all, but you get the idea.
that is not correct. The right way to keep a Li-Ion charged is by trickle charge it when at peak (what ever peak is - 90-95-99%) Even a -10-15% discharge damages the Li-Ion cells. ("natural damage") and will decrease the life of the cells.

But I'm amazed the phone can't work on AC power and switch off battery consumption.

ossipena 2010-02-11 07:12
Re: Battery consumption analysis
 
Quote:
Originally Posted by kaz911 (Post 520705)
that is not correct. The right way to keep a Li-Ion charged is by trickle charge it when at peak (what ever peak is - 90-95-99%) Even a -10-15% discharge damages the Li-Ion cells. ("natural damage") and will decrease the life of the cells.

But I'm amazed the phone can't work on AC power and switch off battery consumption.
are you serious?

Quote:
No trickle charge is applied because lithium-ion is unable to absorb overcharge. A continuous trickle charge above 4.05V/cell would causes plating of metallic lithium that could lead to instabilities and compromise safety.
http://www.batteryuniversity.com/partone-12.htm

TA-t3 2010-02-11 15:48
Re: Battery consumption analysis
 
Quote:
Originally Posted by opax (Post 520371)
Hey everybody!

I ve realised something!
The official N900 charger is not very good for the battery! its intensity of 1200mA is too high..
The ampere rating of the charger does not matter at all, as long as it is as high or higher than what the device can absorb (if it is rated lower then that just means longer charging time). So, it can never be too high, so to speak. The device wouldn't even know.

les_garten 2010-02-11 17:06
Re: Battery consumption analysis
 
I love this new Toy!

Here's a baseline I did to see what was minimal standby for me.

This is a fresh Reboot, WiFi off, BT off, WiFi Module unloaded with WiFi Switcher. No IM accounts polling. ATT network for voice, all Data disabled.

Only used for a few short voice calls. No appz used. Lots of stuff installed from Testing and devel, and Qole, repositories. Phone was parked on the Dashboard and not on a desktop.

My goal was to get a baseline to work from to see the drain over the course of the battery, and test from this as my baseline. Took almost 3 days to run down, not bad.

http://www.turbonet.biz/misc/N900/Battery_1.png

slender 2010-02-11 17:16
Re: Battery consumption analysis
 
Quote:
Originally Posted by les_garten (Post 521458)
I love this new Toy!

Here's a baseline I did to see what was minimal standby for me.

This is a fresh Reboot, WiFi off, BT off, WiFi Module unloaded with WiFi Switcher. No IM accounts polling. ATT network for voice, all Data disabled.

Only used for a few short voice calls. No appz used. Lots of stuff installed from Testing and devel, and Qole, repositories. Phone was parked on the Dashboard and not on a desktop.

My goal was to get a baseline to work from to see the drain over the course of the battery, and test from this as my baseline. Took almost 3 days to run down, not bad.

http://www.turbonet.biz/misc/N900/Battery_1.png
Hmm. Do you understand that on Nokias spec sheet (usa webpage) they say that this phone should have ~11 days standby time. :|

les_garten 2010-02-11 17:25
Re: Battery consumption analysis
 
Quote:
Originally Posted by slender (Post 521476)
Hmm. Do you understand that on Nokias spec sheet (usa webpage) they say that this phone should have ~11 days standby time. :|
I'm not sure what Standby means. I'm not sure anyone else does either, except the guy who originally did the test.

Why you asking me about Nokia's spec sheet? I had nothing to do with it!

slender 2010-02-11 17:44
Re: Battery consumption analysis
 
Probably means just screen off and no calls/data at all and good network quality and wifi off.

Just commented because you were happy for 3 days time and in my opinion it's quite bad because some people have reported over week times for their N900. And if i correctly understood you you have not really done anything with your device?

Ohh..you didn't told how much you spoke so yeah..maybe 3 days is good for your use case.


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