Battery almost empty after 5 hours with locked N810 - Page 7 - maemo.org

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vinc17	2008-07-11 , 10:50
Posts: 227 \| Thanked: 53 times \| Joined on Feb 2008 @ Lyon, France	#61

Originally Posted by Bundyo

@vinc: Isn't the interval between sar gathering data too big?

I don't think so: there's the load average on 15 minutes.

Originally Posted by lardman

Xterm is a known timer offender (i.e. dyntick won't be able to slow the tick speed) - there was a way of fixing this, but I can't remember it off the top of my head. Anyone?

Xterm itself or the shell that runs in it? Note also that Xterm is generally open on my N810 and it usually doesn't make the battery drain.

Also, I've noticed that when I took my N810 away (at about 19:45), the number of context switches per second became much larger:

Code:

$ bzgrep -A1 cswch/s sar.out.bz2 | grep -v 'cs\|--'
15:03:23        43.37
15:18:24        73.32
15:33:24        44.73
15:48:24        96.13
16:03:24        43.16
16:18:24        75.86
16:33:24        53.13
16:48:24        40.93
17:03:24        45.56
17:18:24        75.04
17:33:24       115.85
17:48:24        55.92
18:03:24        53.16
18:18:24        75.50
18:33:24        41.73
18:48:24        39.74
19:03:24        43.09
19:18:24        50.01
19:33:24        39.50
19:48:24       127.23
20:03:24       467.05
20:18:24       593.56
20:33:24       402.17
20:48:24       349.61
21:03:24       371.54
21:18:24       370.51
21:33:24       367.58
21:48:24       356.47
22:03:24       456.97
22:18:24       445.43
22:33:24       460.53
22:48:24       350.02
23:03:24       335.38
23:18:24       334.98
23:33:24       335.45
23:48:24       334.65
00:03:24       335.13
00:18:24       334.56
00:33:24       567.83
00:48:24       513.36
01:03:24       616.60
01:18:24       641.06
01:33:24       605.34
01:48:24       577.53

I recall that at 22:35, the battery was still full (if the battery status is reliable, at least a little).

Quote & Reply |

twaelti	2008-07-11 , 10:53
Posts: 883 \| Thanked: 980 times \| Joined on Jul 2007 @ Bern, Switzerland	#62

Originally Posted by brontide

Searching google is often more effective, if you know the right incantation to make it only search iTT. While "battery" on the site search brought up 52 hits, "battery drain" brought back 1 and it's specifically related to the 800 not charging issue.

Unfortunately google can also provide a lot of useless hits as well.

I hate to say it, but it's not always obvious even for a well trained person to find the appropriate information inside iTT threads.

That's why I keep "advertising" tabletSearch, a Google Custom Search Engine specifically for searches in our beloved "maemo universe":

You WILL find the relevant information

Quote & Reply |

vinc17	2008-07-11 , 11:08
Posts: 227 \| Thanked: 53 times \| Joined on Feb 2008 @ Lyon, France	#63

A possible cause of the problem: I've noticed that after locking the device, if the screen is still on and I press one of the two keys on the left, the message "Move ... to unlock" appears and the screen remains on. So, if one of these keys was pressed when I put the N810 in my pocket, the screen could remain on for quite a long time. This could explain why the problem occurs infrequently (for me). Now, I didn't have any such problem with chinook. Has anything like that changed between chinook and diablo?

Quote & Reply |

	allnameswereout	2008-07-14 , 00:02
	Posts: 3,397 \| Thanked: 1,212 times \| Joined on Jul 2008 @ Netherlands	#64

Is it possible you recharged your device a lot while the battery wasn't completely empty? AFAIK this quickly lowers the capacity of the Li-Ion battery.

What about GPS? Are you using this?

Quote & Reply |

	allnameswereout	2008-07-14 , 00:03
	Posts: 3,397 \| Thanked: 1,212 times \| Joined on Jul 2008 @ Netherlands	#65

Originally Posted by vinc17

A possible cause of the problem: I've noticed that after locking the device, if the screen is still on and I press one of the two keys on the left, the message "Move ... to unlock" appears and the screen remains on. So, if one of these keys was pressed when I put the N810 in my pocket, the screen could remain on for quite a long time. This could explain why the problem occurs infrequently (for me). Now, I didn't have any such problem with chinook. Has anything like that changed between chinook and diablo?

Hmmm... are you using an application like autolock?

Quote & Reply |

vinc17	2008-07-15 , 00:10
Posts: 227 \| Thanked: 53 times \| Joined on Feb 2008 @ Lyon, France	#66

Originally Posted by allnameswereout

Is it possible you recharged your device a lot while the battery wasn't completely empty?

Yes, quite often, to have a full battery most of the time.

AFAIK this quickly lowers the capacity of the Li-Ion battery.

I've heard that, but experience shows that this doesn't seem to be true. Anyway, my battery is still very good: I used my N810 quite a lot (including music playing with mplayer) in the train a few hours ago, and after 4 hours, the battery was half-charged.

What about GPS? Are you using this?

No, GPS wasn't used.

Originally Posted by allnameswereout

Hmmm... are you using an application like autolock?

I used it for a few days three months ago, but as it was turning the screen on too often, I no longer use it.

Quote & Reply |

n9mjg	2008-07-15 , 00:42
Posts: 33 \| Thanked: 14 times \| Joined on Dec 2007	#67

Originally Posted by allnameswereout

Is it possible you recharged your device a lot while the battery wasn't completely empty? AFAIK this quickly lowers the capacity of the Li-Ion battery.

Recharging early was a problem for NiCad batteries, but it doesn't effect Li-Ion batteries (at least not noticeably). What I would be more worried about would be overcharging. Perhaps someone who know more about the design of the charging circuit in the N800/N810 could chime in on this one?

Quote & Reply |

	hordeman	2008-07-15 , 00:57
	Posts: 698 \| Thanked: 129 times \| Joined on Oct 2007 @ CA	#68

I have this issue with my n800. I ordered a new battery to see if having an old battery was the cause.

Quote & Reply |

vinc17	2008-07-15 , 00:57
Posts: 227 \| Thanked: 53 times \| Joined on Feb 2008 @ Lyon, France	#69

Originally Posted by n9mjg

Recharging early was a problem for NiCad batteries, but it doesn't effect Li-Ion batteries (at least not noticeably). What I would be more worried about would be overcharging.

With the N810, charging automatically stops after some time.

Quote & Reply |

	hordeman	2008-07-25 , 23:42
	Posts: 698 \| Thanked: 129 times \| Joined on Oct 2007 @ CA	#70

Originally Posted by hordeman

I have this issue with my n800. I ordered a new battery to see if having an old battery was the cause.

So, to update, I ordered a new battery from accessorypost, and it seems to be performing much better. I can maybe get about 3-4 hours of usage, but if I turn off wifi and lock the screen, it can go about 3 days without recharging.