Sharp yo 600

No unless it has a motherboard battery, once you disconnect the power you empty RAM. There appears to be backup software, but you have to backup before you change batteries. Buy an iPhone or iPad mini and it can be automatic.

https://www.google.com/search?q=Sharp+Wizard+0z-730

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It takes AAA (LR03) alkaline batteries. Have you put fresh batteries in?
https://www.manualslib.com/manual/151833/Sharp-Yo-520.html?page=25#manual
Have you cleaned the battery terminals?
This unit is - 18? - years old?
Chances of repair are slim

why don't you replace the battery

I have lost all comm ports for exchanging info to and from my Zaurus 5000. It says my ports are being used by my mouse which is not true.
Anyone have any ideas on how to retrieve ports?

Ted

FROM MY YO-610 USER MANUAL--IF THE UNIT DOES NOT TURN "ON" AFTER REPLACING THE BATTERY (MEMORY) CAREFULLY REPEAT THE BATTERY REPLACEMENT PROCEDURE.

I have a a Sharp yo-480. I've fixed sticky keys many times. I back-up data in the organizer first. (yo-480 doesn't have a flash memory) then carefully dissasemble unit. Lift out rubber keypad and use WD-40 to wipe circut board and keypad. It's the sticky residue that makes the keys stick

If both of your battery sets have gone flat then you have lost all of your information
For your friend to have all of her info in place when she changed the batteries, the backup battery must have been OK which would have saved the info stored.
I would suggest when you use your psion to then back everything to a pc using psiwin 1.1
It's free to download from the internet.
Tom

first and foremost, I have to how you removed the battery and how you replaced it? cos there are methods of doing this.
well in case of another time, you have to disconnect all cables on the board including the Cd, battery and others, then you can go ahead and do what you said you've done.

unscrew 3 little screws at the bottom cover using jewelry phillip driver-remove the cover- you will see further instructions inside the cover. This model requires 5 batteries CR2032 (4 for main memory-1 for backup memory)-Hope it helps.

On the back of the unit, there is a battery selector switch. Move the selector to the 'replace batteries' position. Now you can open the main battery compartment. Adjacent to the main compartment is a smaller hatch secured by a small hex-head screw. Loosen and remove the screw to remove the hatch cover. Then you can remove and replace the old 2032 battery with a new one. Reverse the procedure to secure the hatch, ensure you have fresh batteries in the main battery compartment, replace the main hatch, select 'normal operation' and you should be good to go.