Reply
Thread Tools
xiskillo's Avatar
Posts: 88 | Thanked: 77 times | Joined on Nov 2009 @ Spain
#31
Hi guys

My N900 dont save the time and date anymore after of remove the battery for few seconds adn suppose i need replace the bupbat capacitor coin.

Do you know any store on internet where i would buy it??

I could not find nothing on stock with the info give by @joerg_rw
 

The Following User Says Thank You to xiskillo For This Useful Post:
joerg_rw's Avatar
Posts: 2,222 | Thanked: 12,651 times | Joined on Mar 2010 @ SOL 3
#32
http://www.mouser.de/Passive-Compone...yznegtZ1yzvmag

http://www.digikey.com/product-searc...=0&pageSize=25

http://www.elna.co.jp/en/capacitor/d...f/dsk414_e.pdf looks good
__________________
Maemo Community Council member [2012-10, 2013-05, 2013-11, 2014-06 terms]
Hildon Foundation Council inaugural member.
MCe.V. foundation member

EX Hildon Foundation approved
Maemo Administration Coordinator (stepped down due to bullying 2014-04-05)
aka "techstaff" - the guys who keep your infra running - Devotion to Duty http://xkcd.com/705/

IRC(freenode): DocScrutinizer*
First USB hostmode fanatic, father of H-E-N

Last edited by joerg_rw; 2016-09-08 at 04:20.
 

The Following 6 Users Say Thank You to joerg_rw For This Useful Post:
Posts: 24 | Thanked: 35 times | Joined on May 2015
#33
Originally Posted by joerg_rw View Post
Anyway BB_CFG register reset default is 0b00000000, for polyacene cap PAS414 (!!!) I suggest setting it to 0b00011111 as soon as possible during boot
For the record, it's `i2cset -f -y 1 0x4b 0x12 0x1f b`.
__________________
<cas> well there ya go. say something stupid in irc and have it immortalised forever in someone's .sig file
 

The Following 6 Users Say Thank You to L29Ah For This Useful Post:
Posts: 330 | Thanked: 860 times | Joined on May 2011
#34
Looking for a replacement backup battery available today.

Seems to me that there is enough room around the battery to replace it by something slightly bigger.
Did some/one of you replace it recently?
With what?

Finally, after some years experience, li-ion battery or capacitor?
__________________
Toshiba Libretto 70ct -> Psion -> Palm -> Openmoko Freerunner -> gta02 -> gta04 -> n900 n900 n900 n900
...recycled devices, hack, arduino...
 

The Following User Says Thank You to ric9K For This Useful Post:
Maemish's Avatar
Posts: 1,700 | Thanked: 4,751 times | Joined on Apr 2018 @ Helsinki, Finland.
#35
Hah, is there anothner battery? Loosing time and date while removing battery - I thought it as a device character. Are there some other problems if it's dead?
__________________
"I don't know how but I can try!" (active)

Master of not knowing (active)

For me it is possible to get lost in any case (active)

Learning to fall from high (DONE)

Learning to code with BASIC (WIP)
 
Posts: 330 | Thanked: 860 times | Joined on May 2011
#36
Yes, another battery. You can see it on the first page of the thread.

There aren't any other problems if it is dead. They all seem to die after one or two years.
__________________
Toshiba Libretto 70ct -> Psion -> Palm -> Openmoko Freerunner -> gta02 -> gta04 -> n900 n900 n900 n900
...recycled devices, hack, arduino...
 

The Following User Says Thank You to ric9K For This Useful Post:
Posts: 330 | Thanked: 860 times | Joined on May 2011
#37
I guess no answer means nobody knows but just to be sure, I bump this:

Do someone know with what we could, today, replace the backup battery?
Capacitor, li-ion? Bigger size?
thanks
__________________
Toshiba Libretto 70ct -> Psion -> Palm -> Openmoko Freerunner -> gta02 -> gta04 -> n900 n900 n900 n900
...recycled devices, hack, arduino...
 
nonsuch's Avatar
Posts: 584 | Thanked: 1,550 times | Joined on Sep 2019
#38
Any battery that has the same voltage?
If you can fit it in there nicely (no stray contacts to other components), I don't see how this could break your machine.
 

The Following User Says Thank You to nonsuch For This Useful Post:
pichlo's Avatar
Posts: 6,445 | Thanked: 20,981 times | Joined on Sep 2012 @ UK
#39
Originally Posted by Maemish View Post
Hah, is there anothner battery? Loosing time and date while removing battery - I thought it as a device character. Are there some other problems if it's dead?
Yes, there is a small battery, about 3 mm across and 1 mm high, as a backup for the system timer while you are replacing the main battery (or the main battery is dead). It is supposedly rechargeable but it is never recharged (rumours are that an updated kernel enables the recharging but this did not happen in my experience), so it eventually dies after a few years.

The only negative effect is that, if you let your main battery discharge (or take it out), then the first thing the phone does the next time you switch it on is ask you to enter the current date and time.

Originally Posted by ric9K View Post
Do someone know with what we could, today, replace the backup battery?
Capacitor, li-ion? Bigger size?
I have been wondering about that too. Particularly the capacitor idea, but the lack of recharging put me off that. Another battery might help, as nonsuch says, but it seemed too much hassle to me to bother.
__________________
Русский военный корабль, иди нахуй!
 
Posts: 330 | Thanked: 860 times | Joined on May 2011
#40
Originally Posted by pichlo View Post
Yes, there is a small battery, about 3 mm across and 1 mm high, as a backup for the system timer while you are replacing the main battery (or the main battery is dead). It is supposedly rechargeable but it is never recharged (rumours are that an updated kernel enables the recharging but this did not happen in my experience), so it eventually dies after a few years.

The only negative effect is that, if you let your main battery discharge (or take it out), then the first thing the phone does the next time you switch it on is ask you to enter the current date and time.



I have been wondering about that too. Particularly the capacitor idea, but the lack of recharging put me off that. Another battery might help, as nonsuch says, but it seemed too much hassle to me to bother.
Sure, lot for few. Especially if the battery is not recharged. I thought there was a way to enable the charging by sending some bits somewhere (sorry) with I2C-something. Gotta find and try that. (unless you are sure it doesn't work).
EDIT: oops, instruction in post 33, just above.

On the orher hand, I often remove the battery and am a bit bored to
Code:
ntpd -s
each time.
__________________
Toshiba Libretto 70ct -> Psion -> Palm -> Openmoko Freerunner -> gta02 -> gta04 -> n900 n900 n900 n900
...recycled devices, hack, arduino...

Last edited by ric9K; 2020-01-21 at 20:16.
 

The Following User Says Thank You to ric9K For This Useful Post:
Reply

Tags
battery, clock cmos rtc, hardware hackin, nokia n900, soldering

Thread Tools

 
Forum Jump


All times are GMT. The time now is 14:15.