N900 battery duration

There is a bug in the cellmo SW related to absence of SIM: the current is higher when the SIM is not in.
So in real life use case (i assume people who will buy it will actually use it as a phone) the use time will be longer.
I would also assume that the sshd makes a difference.
I have no data to back it, but i'm quite sure it has not been profiled for mobile usage.

igor

________________________________________
From: maemo-users-bounces@maemo.org [maemo-users-bounces@maemo.org] On Behalf Of ext Tuomas Kulve [tuomas@kulve.fi]
Sent: 25 October 2009 13:45
To: Andrew Flegg
Cc: maemo users
Subject: Re: N900 battery duration

Andrew Flegg wrote:
> On Sat, Oct 17, 2009 at 12:34, Tuomas Kulve <tuomas@kulve.fi> wrote:
>> This is now run on a 41-10 release without SIM, without WLAN, without
>> charger, with only ogg-support and sshd installed (default widgets on
>> the desktop), and display blanked via the lock button:
>>
>> C4 | 99.5% | 2297.0ms |
>
> Bet it'll last for *aaaages* :-)

93.75 hours.

I'm not going to repeat that test but based on my other tests, I would
guess that it wouldn't fluctuate more than a few hours.

--
Tuomas

Igor.Stoppa@nokia.com wrote:
> There is a bug in the cellmo SW related to absence of SIM: the current is higher when the SIM is not in.
> So in real life use case (i assume people who will buy it will actually use it as a phone) the use time will be longer.

I guess I need to do more testing then :)

Although I'm not sure how to accomplish that as I need my SIM for the
daily use..

> I would also assume that the sshd makes a difference.
> I have no data to back it, but i'm quite sure it has not been profiled for mobile usage.

I assumed sshd wouldn't do anything if there are no connections to it.

--
Tuomas

On Fri, Oct 16, 2009 at 10:48:27AM +0200, Andrea Grandi wrote:

> after some days using the N900 (with already lot of charge/discharge
> cicles) I'd like to compare my battery duration with other people.

During the first days I used the N900 a lot, including browsing the
web, instant messaging, e-mail, etc. The battery didn't last much more
than a day, so I had to recharge it everyday at night.

But then I wanted to compare its battery life with that of my old
phone, so I started using it in a more conservative way: phone calls,
text messages, calendar, alarm clock and occasionally as a media
player. I also used the camera to take some pictures here and there
and I connected to the Internet a few times to read my e-mail or check
a couple of websites, but only for a 2-3 minutes each time.

I charged the N900 on Wednesday night, and it's almost exhausted now,
so it lasted for ~4 days, which is quite good, I think, to get an
idea.

Berto

Tuomas Kulve wrote:
> Igor.Stoppa@nokia.com wrote:
>> There is a bug in the cellmo SW related to absence of SIM: the current is higher when the SIM is not in.
>> So in real life use case (i assume people who will buy it will actually use it as a phone) the use time will be longer.
>
> I guess I need to do more testing then :)
>
> Although I'm not sure how to accomplish that as I need my SIM for the
> daily use..

The previous test was without a SIM card. The device was very idle and
run for 93.75 hours (with a guessed few hour error marginal).

After charging the battery I inserted the SIM card, rebooted and started
a new test. I received two calls (hung up immediately), I received two
SMS messages and sent one, and the notifier led was blinking for 45 mins
at one point. Otherwise the device was idle and run for 93.62 hours. So
pretty close to the test without a SIM card.

I have a small shell script running there that writes a log every 60
seconds. After writing the log it runs the "sync" command and starts the
loop again. I'm assuming it doesn't affect the total run time much in an
otherwise idle device.

--
Tuomas

I just managed to keep my n900 online for about 92 hours.

how?
- no wifi, 3g, edge or bluetooth
- a few short calls. not more then 10 mins in total
- about 5 hours of media player + FM transmitter (!) usage (playing mp3
files)
- I shut it down every evening and started it each morning, writing
down the exact time. so the 92 hours is actually spread over 6 days.

it's no suprise that turning off wifi/edge/3G/bluetooth is good for
battery saving, but i found it great to learn that the FM transmitter
doesn't need much juice.

Dieter

________________________________________
From: maemo-users-bounces@maemo.org [maemo-users-bounces@maemo.org] On Behalf Of ext Tuomas Kulve [tuomas@kulve.fi]
Sent: 30 October 2009 07:41
To: maemo-users@maemo.org
Subject: Re: N900 battery duration

Tuomas Kulve wrote:

> So pretty close to the test without a SIM card.

Even if the duration might be the same, the SIM card actually triggers network activity.
Depending on the operator having firewalls or not, this also makes the phone spend more
energy when stuff like port scans are coming.

igor

Igor.Stoppa@nokia.com wrote:

> Even if the duration might be the same, the SIM card actually triggers network activity.
> Depending on the operator having firewalls or not, this also makes the phone spend more
> energy when stuff like port scans are coming.

I didn't have data connection open, so no IP network traffic was
transferred.

--
Tuomas

I wrote a blog post about my ogg vs. mp3 measurements:

http://tuomas.kulve.fi/blog/2009/11/07/n900-battery-duration-ogg-vs-mp3/

--
Tuomas

On Saturday 07 November 2009 11:55:52 Tuomas Kulve wrote:
> I wrote a blog post about my ogg vs. mp3 measurements:
>
> http://tuomas.kulve.fi/blog/2009/11/07/n900-battery-duration-ogg-vs-mp3/
>
Wow, awseome! thanks for that very interessting blog entry.

Regards,
Max

hi,
________________________________________
From: maemo-users-bounces@maemo.org [maemo-users-bounces@maemo.org] On Behalf Of ext Tuomas Kulve [tuomas@kulve.fi]
Sent: 07 November 2009 12:55
To: maemo-users@maemo.org
Subject: Re: N900 battery duration

> I. wrote a blog post about my ogg vs. mp3 measurements:
> http://tuomas.kulve.fi/blog/2009/11/07/n900-battery-duration-ogg-vs-mp3/

Sorry to again make these comments after you have run the measurement.
But in your cases you are seeing an offset due to the speaker protection algorythms.
Running the test with a headset plugged in would get rid of the offset.

igor