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OESF Forums > Distros, Development, and Model Specific Forums > Model Specific Forums > 5x00 Hardware
SueZ
I have a Zaurus 5500. Through my own carelessness-I wore out the backup battery. It's not a huge deal-in the rare event I need to do a software reset-I can just restore my data from the CF card quickly using the restore app. I can also avoid having to do this by resetting when I am plugged into an AC outlet.

I am curious if the backup battery is user replaceable-like a CMOS battery on a PC? I have been unable to find detailed schematics on the guts of the 5500-so I don't want to risk taking it apart if I may ruin it in the process. (I've grown quite attached to my Z... biggrin.gif ) Rather than waste time calling Sharp Tech Support-I thought somebody may have run into this, and could give me some insight.

Thanks So much!

Sue
lardman
Not schematics, but a pic or two.

Si
padishah_emperor
QUOTE(lardman @ Mar 15 2005, 02:53 PM)
Not schematics, but a pic or two.

Si
*

I can't see the backup battery.

Actually I didn't even know the SL-5500 has one, I thought it just retained a stored charge for a short period.
SueZ
Thanks Lardman-That's a great start!
SueZ
Now the question is-Where is it, and can I get a replacement.....

laugh.gif
TRIsoft
SueZ,

the SL-5500 model is not equipped with a backup battery.

I think there was one in the planning stage, but never made
it into mass production.

So don't waste time searching wink.gif

///TRIsoft

Marc Stephan
lardman
Strange, because the instruction booklet said to charge for 24Hrs before use to charge the backup battery.

Si
SueZ
Hi Marc,
The manual says there is one-and I suspect it did make into production, because I never had a problem with a software reset erasing my data/apps until I let my Zaurus battery rundown completely (accidently).

But like I said-it's a rare occasion my Z gets hung-and when it does-there are a couple of workarounds, so it's not a BIG deal. I'm curious by nature, and I just like everything to work right! cool.gif

I just upgraded the ROM to Sharp 3.10-so perhaps the rare hanging problem will not show its face again anyway.
TRIsoft
Hi,

not only the manual mentions it, also the service documentation
shows how to replace the battery (see the attachment).
Click to view attachment

But if i don't have a big blackout now, i would say i never seen
the battery in a SL-5500. Afaik it never was installed.

If anybody really found it in his 5500, please post here. Maybe
in the US market models there was a battery unsure.gif

///TRIsoft

Marc Stephan
BlackCardinal
From the service manual page provided by TRIsoft, it looks like it's under the black cover on the board in the lower right of lardman's first picture.
SueZ
Oh Marc-YOU ROCK! Thanks so much. I have looked high and low for specifics on this. I'll let you all know if I get brave enough to try this out, and what I find. What are the chances Radio Shack could get a replacement battery for me, or do you think at this point I should call Sharp and see if they sell them?
BlackCardinal
My Sharp manual says it's a 3V battery. If I had to guess, I'd bet it's a CR2032, which is an extremely common disc-type battery used in a lot of computers, including PDAs. You can find it almost anywhere, at least in the U.S. (drugstores, Target, Radio Shack).

If you do open your unit up and find out which type it is, I'm sure I'm not the only one who would be interested in knowing for sure. Please post what you find. Good luck!
TRIsoft
SHAME ON ME !

The battery discussion gave me a bad sleep this night smile.gif

The first what i did this morning was entering the office asking
the 1-Euro-Question: "Guys, does the SL-5500 have a backup
battery ?". Answer was : "No, was planned, but not in".

But as a curious user, i dismantled a sub-pwb, peeled the black
plastic stripe off and see what i found :

Click to view attachment

The battery is not one of the usual CR-20xx series. The SHARP
service manual names it a "Litume battery (ML2016TT2)" the
parts code for it is RDNTL0001YCZZ. Looks like it's a Sanyo
battery :Sanyo spec sheet.

I regret for making a wrong statement yesterday. I really don't
know why we were _that_ sure that there was no battery in the
5500 models.

///TRIsoft

Marc Stephan
SueZ
Hi Marc,
Thanks for looking! Sorry if I cost you any sleep....

I really appreciate all the great info and specifics. I'll see if I can find the battery.
I'm sure more than a few fellow Z owners will find this information extremely valuable, and almost impossible to find!

Thanks again for all your help.

Sue
jdralphs
Has anyone succesfully changed their backup battery?? i recently joined in to this dead backup battery business and while i could survive without a backup battery -- it'd be good to know i can replace it with minimal effort.
jdralphs
I just thought I'd add the update that I now have replaced my backup battery.
psndcsrv
QUOTE(jdralphs @ Feb 3 2006, 08:11 PM)
I just thought I'd add the update that I now have replaced my backup battery.
*


Where did you find a battery? Did you have to purchase directly from Sharp?

I'm having a weird problem where my Z won't boot, and in diagnostic mode my backup battery never gets above 2.7V. I'm thinking that the ROM is detecting a low backup battery and refusing to boot until it gets charged up.

I'd like to replace it, but everywhere I've looked online only sells the batteries in large batches or with $100 minimum orders. Neither of which I'm too keen to do.

Any pointers on changing it would be welcome as well. I'm not afraid of soldering, but if you learned something to make it easier when you did it, feel free to share!

Thanks!
Ventmore
Does anyone have an update on the availability of the backup batteries, as I am looking to get a used 5500 in the next few weeks, and it may be useful to know smile.gif

Cheers
Ventmore
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