Re: Turn off or standby?
 

That is what i tried to say, but i agree with ndi that i messed a little with units (''appleoranges" ;) )

Re: Turn off or standby?
 

fwiw, here is the result of a test run:

# chrge volts %
0 1070 4052 85
1 974 3976 --
2 920 3976 72
3 963 3976 76
4 954 3941 75
5 964 3935 77
6 910 3952 72
7 921 3923 73
8 876 3947 69
9 910 3947 72
10 838 3923 66
11 887 3917 70
12 838 3905 66
13 810 3917 64
14 824 3911 65
15 796 3899 62
16 810 3894 64
17 782 3888 61
18 768 3882 60
19 729 3852 58
20 711 3823 55
21 743 3858 58
22 729 3870 57
23 687 3847 53
24 673 3829 53
25 673 3799 53
26 660 3847 52
27 648 3829 51
28 648 3823 51
29 639 3817 50
30 638 3799 50

I stopped the test run after the 30th boots. My guess is that it would take 110 to 120 boots to kill a 100% charged battery:). I have rechecked for any possible typo and there is none.

This is what I did:
=============
Between boot 1 to 9:
1. power on
2. waited for all icons at desktop(#4 view) to show up.
3. wait 10 sec
4. launch battery graph to record the values
5. close battery graph
6. switch off
7. wait about 30sec and Goto 1 again.

Between boot 10 to boot 30th.
1. power on
2. waited for all icons at desktop(#4 view) to show up
3. waited until the CPU load widget showing 1 bar.
4. wait 10 sec
5. launch battery graph to record the values
6. close battery graph
7. switch off
8. wait about 1.5 to 2 min and Goto 1 again.

A few notes about my setup:
=====================
My unit has power 47 kernel loaded(but only the default N900 voltage profile is used).

At boot 0th, the % battery was from the advanced power plugin.

At boot 1st, I forgot to record the % battery.

Wifi is enabled, but there is NO internet connection.

Bluetooth is switched off as shown by the advanced interface switcher.

N900 General Profile is used with System sounds set at level 1; speaker volume is set to OFF.

Brightness is set at max level.

Cheers,

Re: Turn off or standby?
 

good work 'cheve' :)

Facts instead of speculation, that the way we like it.

Can see that at boot #30 the voltage was 3.8V which mens that there where about 50% left at that point, so the battery can take up to 60 boots on a charge with your setting and method.

So just doing boots without the waiting etc, it should do up to 100 boots, meaning that the actual drain on the battery is about 1% e.g. 14mA used. but for the sake of the 60 boots we get 1.66% or 22mA used (mA was rounded up)

And for the sake of W we get
3.8V * 14mA = 0.05W (180Ws)
3.8V * 22mA = 0.08W (288Ws)

the Ws was for 'ndi' :)

Re: Turn off or standby?
 

Dr frost:

For your first post, it makes me feel you didn't read my last post :). I have explicitly stated that I was referring to an impossible scenario. I don't know what more to say.

For your second post, I use Ws because of SI units. Also, for clarity.

@cheve
I read your initial post but couldn't find it again. You posted this experiment before, right?

Re: Turn off or standby?
 

no, it is the 1st time.

i hope it is somewhat helpful

Re: Turn off or standby?
 

Ah, it was Matan. I knew I read this before.

Re: Turn off or standby?
 

very useful, thanks for taking the time to put this "myth" to rest. :D

Re: Turn off or standby?
 

I always switched off the mobiles that I had.
Maybe that is the reason why I get up to 3 days with my
N900.
;-)

Since I have my N900 as only phone I even wonder about the strange habit that we all had with landline phones keeping them "online" all night long.
;-)

Re: Turn off or standby?
 

Stock N900 does maintenance overnight - checks for updates, cleans up calendar, etc.

Re: Turn off or standby?
 

Unless You change that behavior to do it in noon/twilight/whatever ;) Anyway, shall we mark this topic as "concluded" and maybe do some wiki article? what do you guys think?

Re: Turn off or standby?
 

I still haven't seen any reports on battery usage during the night leaving the phone "as is", as I always do (GSM on, all data off).

Checking by battery-eye history, when idle my N900 uses about 0.5% per hour, so about 4% of the battery is used during the night.

Probably putting it in offline mode and unloading the WLAN driver would also save a bit. At least for me it's not worth it, prefer to be available at night (e.g. in case of emergency), and the battery lasts for a good 3+ days (OK, I'm not a heavy user..)

Re: Turn off or standby?
 

@ndi,

Do you have any references regarding that overnight maintenance?

Re: Turn off or standby?
 

Reinob, please read whole thread, not only last few posts (especially, that this one is short, only few pages...). Overnight off-line/powercycle was compared and published here long time ago.

Re: Turn off or standby?
 

@Estel,

Must have missed your post, but I have read and followed the thread from the beginning :)

Re: Turn off or standby?
 

I also leave it on all night, but i have every thing on (and i do mean everything) i have a drop of about 5% and here we a talking about the 3000mAh battery, so it really looses some %, a normal battery would be closer to 10%, unless you charge up at night (keep charger connected when sleeping) then it chargers for 1-2 hours of the night and then starts to drop.

Ref. i charge when needed, really no pattern, i never charge doing sleep, and sometimes when im in a hurry and can see that it's low on power i charge it for 10-15minuts, but this still gives me 625mA (half of a normal battery)
For more info on my charging look to post #2 in my battery thread

Re: Turn off or standby?
 

Reinob, if that is the case - sorry about that. Maybe we're all getting little too sensitive about thread reading, but don't worry - i also read every post in thread that i write to, and also been ''accused'' of not doing so same day, except that from little different cause.

Sorry for this little off-topic, but i think that keeping good atmosphere was worth posting that - as a reminder, also for myself.

Re: Turn off or standby?
 

@Estel, no worries. I'm a very "passive" user here so I tend to read a lot and post very little.. but of course sometimes a detail or two can escape my attention :)

Re: Turn off or standby?
 

sorry for my bad english but at the end what is the result? turn off or offline mode to consume only a bit the battery? :-)

Re: Turn off or standby?
 

@iscio,

If you turn off the phone during the night the battery goes down by about 1% (due to the shutdown and restart), while leaving the phone idle during the night takes around 4-5%.

So if you don't need to be available during the night, turning the phone off saves some battery.

Re: Turn off or standby?
 

Not at hand, but you can use Google to check, there is a bug on Bugzilla about Calendar being open in the morning, Nokia said it performs maintenance at 4 am.

Also, if you want you can check alarque.ini for all the scheduled tasks. The list is quite large. Also on this forum you will find tutorials on how to move/disable updating overnight.

As for wiki, not sure if "off eats less than on" deserves its own page.

Re: Turn off or standby?
 

sorry but I don't need to be available during the night but I asked if turn off or use offline mode. Here you can see my screen about night, it seems more than 4-5%

Re: Turn off or standby?
 

The 4-5% is in "power saver" mode, if you like me have no power saving steps in place you will be looking more at 10% (for a 1320mAh battery), also the voltage in the battery is not the easiest to understand

Look at this graph then you will see that a 10% drop in battery graph is not necessarily equal to a 10% drop in capacity, thats why i made my battery meter like i did, it simulates the REAL graph quite good.
Attachment 20167

In batterygraph it goes linear from top to bottom, but as you can see in the graph it is more log than linear

Re: Turn off or standby?
 

"Off eats less than on" maybe not, but our measurements - hell yea. And, as you posted few pages ago, this is quite popular urban legend (about standby = less battery drain), so i think it may be worth wiki'ing (viking). Sure, maybe not in "power-user" section, but "beginners" seems ok for me.

And sure - i know that i can do it myself, probably ;) Just wanted to know what others thing about it, and eventually discuss it.

// Edit

Maybe it should be integrated into one wiki page about battery @ all? With info about voltage/capacity ratio fr_frost presented here, short info and link to "3000 mAh battery mod" (other info regarding "how to buy less faked n900 battery, or real rocking one" is also there), and near-future "hotswap during heavy load" topic... If there is other battery-regarded info on wiki (i don't remember one now, but I may be wrong), we ca integrate it also.