[maemo-users] N900 battery duration

From: Matan Ziv-Av matan at svgalib.org
Date: Wed Nov 11 15:07:01 EET 2009
On Wed, 11 Nov 2009, Frantisek Dufka wrote:

> Matan Ziv-Av wrote:
>> Here is some data:
>> http://talk.maemo.org/showpost.php?p=361648&postcount=23
>> Abstract: The often repeated claim that a reboot cycle wastes a lot of 
>> battery is incorrect.
> Hmm, you proved you can drain battery in 44 reboot cycles in 2 and half 
> hours. To me it says reboot wastes a lot of battery :-) You can play video or 
> surf the web longer than 2.5 hours. In fact there is not many things that 
> could drain battery faster than reboots, is it?

I cannot play video for 2.5 hours on my almost 2 years old N810. I can 
hardly read an ebook for this long.

In addition I have dual boot, including 30s delay. During this delay 
screen is on maximum brightness, and I don't know which power saving 
features are enabled, so without this delay, a few more reboots might 
be possible.

> I have posted my findings with one spare N810 to that thread. I got like 30 
> days with N810 sitting completely idle. That would roughly mean one reboot is 
> 16 hours of standby (with no wi-fi).

This must be very atypical. In similar tests on a new N800 I never even 
managed two weeks (in offline mode).

The main reason I suggest turning off when the device is not going to be 
used for long periods (such as a night sleep) is the non-slim chance 
that something might cause break power saving (metalayer-crawler, router 
incompatible with power saving, forgetting to disconnect bluetooth, 
etc.) and you wake up to see a dead device.


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