Page 5 of 7 « First 34 5 67
Reply
Thread Tools
shadowjk is offline shadowjk
2010-08-15 , 08:28
Posts: 1,258 | Thanked: 672 times | Joined on Mar 2009
#41
I can make the N900 charge meter display 100% for 2 days
 
Benson's Avatar
Benson is offline Benson
2010-08-15 , 09:24
Posts: 4,930 | Thanked: 2,272 times | Joined on Oct 2007
#42
Originally Posted by cesarcesar View Post
o' boo f'n hoo. I paid 40k for my car and I have to spend time and money to give it gas. The more i use it the more gas i have to put in it. wasting time and money is part of life! charging is too. i'd love to hear someone chim in on the actual time it takes to fill the 900 battery and the cost in kilowatts in a daily basis. my guess its no more than 2 hours and 21 cents.
Battery is 3.7V, 1.32Ah, so a full charge is abut 5 Wh; it's provided with a switching power supply, which are typically around 90% efficient, so let's be generous and say 6Wh. At the US average price of 12 cents/kWh, that means 0.072 cents to fully recharge the N900.

No, that's not "free" either, but there's no way to complain about such costs without sounding incredibly lame.
__________________
World's first inductively-charged N900!
 

The Following User Says Thank You to Benson For This Useful Post:
petrelli is offline petrelli
2010-08-16 , 10:25
Posts: 82 | Thanked: 10 times | Joined on Feb 2010
#43
Test 3)

Same characteristics but without IM enabled, I list them again

- Wifi disabled, 3G enabled, no IM accounts enabled, kernel ideal loaded, 2 desktops, widget of calendar, three contacts in desktop, two widgets-like indicating the internet IP and the battery percentage, brightness to the 1 position, display almost all the time disconnected. Mail autocheck each 30 min.
- A not so-constant slope seen in BatteryGraph app, like repetitive cycles of higher slope I guess coinciding with navigation

Well, last time with 3G and IM enabled (brightness 3), I had a battery decrease of a 42% in 2h 46min -> -0.253% / min

Now, this are the results, -66 % in 4h 15min -> 0.259% / min

(detailed)
- 7:55 90%
mail
casual navigation (< 5 min)
3 SMS sent
- 8:13 83%
nothing
- 9:02 74%
mail erase some messages
sms received
- 10:13 68%
mail erase some messages
navigation 5 min
- 11:03 48%
mail erase some messages
navigation 5 min
- 12:10 24%



So, conclusions, having the two IM accounts enabled has not implied a significant difference, has it? Or if not, perhaps I have had this time a little more activity, but since both IM were disabled I have kept the same battery decrease. In any case, the differences are minimum, in my opinion the price you pay to be connected is not huge, but rather acceptable.

What I think is not acceptable, is that with such a minimum activity, the n900 is so empty of energy.

This time we have moved from subjectivity to objectivity, then I have two questions:
a) Is this a normal behaviour of the n900?
b) Is this a reasonable behaviour of the n900, taking into account what the other devices offer? Just to decide which position the n900 deserves in an hypothetical top chart.

As a subjective note, I had the same battery-sensations with the n900 normal-clocked and without extra-devel enabled, two options that however I find absolutely necessary to have a decent n900 experience.

EDIT: No catorise or similar installed, since I read time ago that it had a bug that could induce a high and constant CPU usage
Last edited by petrelli; 2010-08-16 at 10:31.
 
slender is offline slender
2010-08-16 , 10:40
Posts: 2,829 | Thanked: 1,459 times | Joined on Dec 2009 @ Finland
#44
Originally Posted by petrelli View Post
So, test 1:

- Wifi disabled, 3G enabled, permanent internet connection, skype and gtalk accounts enabled, three times viewing mail, three times consulting a web page (less than 5 min browsing in total).
- A constant slope seen in BatteryGraph app.

-> From ~8:50 to 11:36, battery from full (~96%) to a 54%.

Other details, kernel overclocking at "ideal" conf, 2 desktops, widget of calendar, three contacts in desktop (saying if they are online or not with the green dot), two widgets-like indicating the internet IP and the battery percentage, brightness to the 3 position, display almost all the time disconnected. Mail autocheck each 30 min.

Well, this is a behaviour not surprising for me based on my past experience. However, perhaps being always connected with the two IM accounts makes a big difference.

Test 2 will be the same with the two IMs disabled.

(now, at 11:42, a 52%)
If i did understand your test case then i would say that something fishy is going on. Only difference between test 1 and test 2 is that in test 2 you have IM accounts disabled. That alone should give you less drainage compared to test 1. Hmmm...btw. IIRC some people had problems with ip-widget and also battery %-widget. I do not know current sitsuation, but when we are speaking about widgets (constantly running on background) i would remove as many as possible to be sure.
 
slender is offline slender
2010-08-16 , 10:50
Posts: 2,829 | Thanked: 1,459 times | Joined on Dec 2009 @ Finland
#45
Originally Posted by petrelli View Post
What I think is not acceptable, is that with such a minimum activity, the n900 is so empty of energy.
Yes this is not acceptable behaviour. And very very much thank you for providing detailed answers. This is how you can help yourself and other people here. Also you can export graph from batterygraph (from top menu) to make next time even detailed. This also helps to track battery drainage for yourself.

This time we have moved from subjectivity to objectivity, then I have two questions:
a) Is this a normal behaviour of the n900?
What i have seen here and from my own experiences with N900 i would say that you have some weird drainage going on. Do not know if itīs because of custome kernel or some application on background. I would also recommend to list applications by running in xterm
maemo-list-user-packages

b) Is this a reasonable behaviour of the n900, taking into account what the other devices offer? Just to decide which position the n900 deserves in an hypothetical top chart.
As i said before I think that you are experiencing some sort of bug either from 3rd party app or from official maemo OS or app.

As a subjective note, I had the same battery-sensations with the n900 normal-clocked and without extra-devel enabled, two options that however I find absolutely necessary to have a decent n900 experience.

EDIT: No catorise or similar installed, since I read time ago that it had a bug that could induce a high and constant CPU usage
There is powertop named application in extras-devel which can help in finding out what is causing battery drainage on your phone.
http://maemo.org/packages/view/powertop/
Code:
Add devel-testing to app manager
run xterm
root
close other apps
powertop
minimize xterm and go to desktop, lock n900, leave it on table for couple of minutes, open it up and research powertop output. Most of time device should be in sleep.
 
cesarcesar is offline cesarcesar
2010-08-16 , 11:18
Posts: 85 | Thanked: 5 times | Joined on Nov 2009
#46
i installed powetop about two weeks ago but have not figured out how to use it. any suggestions?
 
slender is offline slender
2010-08-16 , 11:27
Posts: 2,829 | Thanked: 1,459 times | Joined on Dec 2009 @ Finland
#47
Originally Posted by cesarcesar View Post
i installed powetop about two weeks ago but have not figured out how to use it. any suggestions?
Did you manage to run it?
Itīs shell application. Itīs pretty geeky and i do not understand it+s ouput fully, but i do understand/see when something is not right. Hard to explain

http://maemo.org/packages/view/powertop/
http://www.lesswatts.org/projects/powertop/powertop.php
http://www.linuxpowertop.org/powertop.php

Use google and power search to learn more. And run it with different usage scenarios on your N900.
 
cesarcesar is offline cesarcesar
2010-08-16 , 11:32
Posts: 85 | Thanked: 5 times | Joined on Nov 2009
#48
Did you manage to run it?
I have not. I will look into the links you posted, thanks. The first i have already and it is useless as far as usage goes.
 
myrjola is offline myrjola
2010-08-16 , 11:51
Posts: 84 | Thanked: 121 times | Joined on Jul 2007
#49
Wiki seems to have some explanation about powertop output (see the Analysis tools section):

http://wiki.maemo.org/N900_Software_Power_management
__________________
--
my
 

The Following User Says Thank You to myrjola For This Useful Post:
AlMehdi is offline AlMehdi
2010-08-16 , 11:59
Posts: 1,751 | Thanked: 844 times | Joined on Feb 2010 @ Sweden
#50
Originally Posted by petrelli View Post
Another (improvised) test.
Unplug from dc at 12:00, both the iphone 3gs and the n900.

The iphone, with 3G activated. The n900, with offline (airplane) mode, cause I wanted to keep battery.

13:45, I take the iphone to search some web page. Before, I see the battery. Wow, a 97%, impressive.

14:00, I take the n900, I put it in online mode. Let's see the battery (starting from the typical 96%). Wow, a 89% (!), with airplane mode?

I really didn't expect such battery drain when the phone is just doing nothing at all. Or in the opposite, I didn't expect the iphone to be almost at the 100% with 3G (but no data connections) activated.

More tests ongoing.
Um.. you oughta do something wrong. I let my n900 automatically switch to flight mode during night. It uses aprox 50mAh during that time.. About 8-10h that is. It means about 4% drain for 10 hours. Your iphone takes 3% on 2 hours. Do the math.... I am guessing you have configured your ideal profile wrong.. or not configured it at all.
Last edited by AlMehdi; 2010-08-16 at 12:05.
 
Reply
Page 5 of 7 « First 34 5 67

« Previous Thread | Next Thread »
Thread Tools

 
Forum Jump


All times are GMT. The time now is 14:07.

Contact Us - Home - Archive - Top