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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Nokia N900 (https://talk.maemo.org/forumdisplay.php?f=44)
-   -   [HW-FIX] losing time/date on battery swap? Replace bupbat (https://talk.maemo.org/showthread.php?t=90864)

pichlo 2020-01-22 08:43
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by ric9K (Post 1564597)
EDIT: oops, instruction in post 33, just above.
Wow, I even thanked that post. I have absolutely no recollection of that :confused:

It's irrelevant anyway. My N900 has been lying dormant for over two years :(

Trzyzet 2020-01-28 00:18
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Most devices have 0.2F 3V capacitor instead of battery. It's funny issue, because faulty cap significantly reduces time on battery, I had this issue in N95-2 and my PSP. After replacing cap both problems - short battery life and clearing RTC after battery removing has been fixed.

Capacitor looks like this: https://i.postimg.cc/JzwYcZDy/42264039.jpg

pichlo 2020-01-28 08:33
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by Trzyzet (Post 1564828)
Access Denied
You don't have permission to access "http://in.element14.com/productimages/standard/en_GB/42264039.jpg" on this server.

Reference #18.ad921602.1580200366.4d576521



However, capacitors look like this: https://duckduckgo.com/?q=capacitor&...ages&ia=images

Trzyzet 2020-01-28 08:54
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by pichlo (Post 1564830)
Access Denied
Reuploded the image. This cap is very special :D

biketool 2020-01-28 18:55
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
I have several still in the tape from Joerg but it has been several moves so I have to scour the interior of the Tardis and find the time.

nonsuch 2020-01-29 06:08
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by Trzyzet (Post 1564828)
Most devices have 0.2F 3V capacitor instead of battery. It's funny issue, because faulty cap significantly reduces time on battery, I had this issue in N95-2 and my PSP. After replacing cap both problems - short battery life and clearing RTC after battery removing has been fixed.
How much does it reduce battery life? I'm trying to assess if I should bother replacing that.
With a battery that is not new, my N900 can go ~ 1 day doing maintenance (ssh, un/installing stuff etc.), more just using it.

Maemish 2020-01-29 06:19
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
That would be a really good to know. I could also bother to replace it if it indeed affects significantly on battery life.

ric9K 2020-01-29 07:40
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by Trzyzet (Post 1564828)
Most devices have 0.2F 3V capacitor instead of battery. It's funny issue, because faulty cap significantly reduces time on battery, I had this issue in N95-2 and my PSP. After replacing cap both problems - short battery life and clearing RTC after battery removing has been fixed.

Capacitor looks like this: https://i.postimg.cc/JzwYcZDy/42264039.jpg
If a defective cap drains the battery, does a li-ion battery also do?
Because Joerg_RW says the original is a li-ion battery not a cap. (post #1)

Also, he says we could replace the bupbat with a 3.2V cap, not a 3V.
Does this 0.2V makes a difference?

In the mean time, or for those who don't want to replace it, we could just remove the Backup battery. Solving, at least, the battery drain problem.

pichlo 2020-01-29 08:48
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by ric9K (Post 1564867)
Does this 0.2V makes a difference?
In theory, maybe. In practice, no.

Trzyzet 2020-01-29 09:34
Re: [HW-FIX] losing time/date on battery swap? Replace bupbat
 
Quote:
Originally Posted by ric9K (Post 1564867)
If a defective cap drains the battery, does a li-ion battery also do?
Because Joerg_RW says the original is a li-ion battery not a cap. (post #1)
That's not a battery. For very long time I also thought this component is a battery but no - This is a capacitor. It should have even its parameters on the side :)
Quote:
Originally Posted by ric9K (Post 1564867)
Also, he says we could replace the bupbat with a 3.2V cap, not a 3V.
Does this 0.2V makes a difference?
Does not matter in this case.
Quote:
Originally Posted by ric9K (Post 1564867)
In the mean time, or for those who don't want to replace it, we could just remove the Backup battery. Solving, at least, the battery drain problem.
Exactly, if you can't find or solder a new one, you can just remove it to prevent main battery from draining.


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