Re: Battery almost empty after 5 hours with locked N810
 

I have been on holidays for about two weeks and didn't have any battery problem there, even though wifi was sometimes on (and I was usually charging my N810 only during the night): at the end of the day, the battery was still almost full. Now, I came back from holidays, and after several hours in my lab, with wifi disabled, the battery was almost completely empty (while it was full in the morning)! The N810 was hot. Yesterday, the battery was half-empty, but I don't remember the conditions (I don't know if the battery drain occurred in my lab or later).

I still wonder what the cause is. I recall that I had never had such a problem with chinook. So, it could be diablo (or a configuration change due to the reflash) + something in the environment.

The temperature? The room at my lab is particularly warm. But I already had battery problems in the evening.

Also, the N810 is more often in my pocket, sometimes with keys near it (of course, the keys don't touch it, but there is a bit more pressure, and this also means that there's metal near the N810).

Notes was running, but the battery drain problem already occurred without Notes.

Re: Battery almost empty after 5 hours with locked N810
 

Pesky metalayer crawler again? I thought they'd fixed that (I disable mine out of principle).

Re: Battery almost empty after 5 hours with locked N810
 

I don't see any reason why it could be the cause. And note that the load average is always around 0.

EDIT: and htop says that metalayer-crawler has taken only 3 seconds of CPU time.

Re: Battery almost empty after 5 hours with locked N810
 

Hi forum...

Im just reporting that battery life has become under par since my upgrade to Diablo. I think a bug of some kind is to blame, although disabling wifi and all applets does extend the battery life it is way less than before...

I hope an update will be issued soon...

Re: Battery almost empty after 5 hours with locked N810
 

I have just started having similar problems with my N800.

I currently keep it plugged in while at my desk at work, where I am using it as a FlashDrive running the Ceedo environment on my locked down XP box.

I have run this way without being plugged in and the battery has lasted all day, although I did plug it in when I got home.

Today I have noticed that when I have been away from my desk with the N800 in it's pouch in my pocket the battery is almost completely drained after ~1 1/2 hrs and the battery / back of the unit is noticeably warm when I take it out.

Bt & Wifi off and no use of the tablet at all, screen and touch pad locked.

Because the D-Pad etc are exposed...could constant "button" pushing be causing the battery drain?

While at my desk I tend to keep the Process List from the osso-statusbar-plugin open trying to gauge the usage of the SD card... I have not noticed anything utilizing huge amounts of CPU time.

Any help is appreciated.


N800 Diablo on mmc2,Rotate kernel, Adv Back light Plugin, OMWeather, Personal Launcher, GPE Summary.

TIA

Re: Battery almost empty after 5 hours with locked N810
 

Just wondering: Is there a way to *measure* power consumption in the N8x0? Something like the internal temperature sensor built into the device? This would at least provide a trigger (play some sound?) which could be used to actively search/run test programs when the problem occurs (which btw happens on my N810, too).

Re: Battery almost empty after 5 hours with locked N810
 

I don't think it's possible with the tablet taken alone but I developed a relatively simple DIY hardware probe for measuring the battery load in real-time. It does not require soldering work or any modifications in the tablet's internal circuitry. See an illustrated guide how to set it up with a N800 at
http://42.pl/u/10uy_Monitoring_N800_battery_load_HOWTO

take care,
/burbie

Re: Battery almost empty after 5 hours with locked N810
 

I didn't see it mentioned but putting your N810 in the supplied case and placing in your pocket repeatedly activates the display when anything is pressed against it. I had my go dry one night after a full charge. I discovered that there are some WiFi access points in my area that are far enough away that the signal fades in and out. I noticed this because of the connection lost sound and the fact my N810 is next to my bed playing additional duty as alarm clock. I've started leaving the device on but setting it offline so WiFi wouldn't wake it up and it wouldn't look every 10 minutes. It may be a coincidence but I haven't had the low battery over night problem. I could of course power down over night because the alarm still wakes the N810 up to sound off. Perhaps there are additional causes that result in this symptom. I only know what seems to work for me.

Re: Battery almost empty after 5 hours with locked N810
 

Lock it first.
Powering down and back on uses more juice than letting it sleep.

Re: Battery almost empty after 5 hours with locked N810
 

If the tablet is locked, this shouldn't happen. However I've noticed that pressing keys on the locked tablet can prevent the display from switching off: a message "Move [_*] to unlock" is displayed and the display remains on. This may be the cause of the battery drain for me, but I'd say this is unlikely (unless there's something else that occurs when one presses keys while the tablet is locked), because a key press/release would have to occur at least every two minutes.

Here if the wifi connection remains on during the night while the tablet is unplugged, the battery remains full in the morning. I could even use my N810 for several days without recharging it (no intensive use, though).

A few weeks ago, I had quite an intensive use of my N810 (wifi most of the time, use of web, terminal and Notes, display settings: 3/5), and the battery indicator had been full during 15 hours. So, this shows that my battery is still very good, and the battery only couldn't explain the drain.

Since I almost no longer put my N810 in my pocket, I no longer have any problem, except once while the tablet was in my bag (I don't know if this is related, though).