The back up battery always shows 100%, as far as my experience shows. The backup battery is only utilized to retain memory while the main battery is dead. The backup battery charges first, so if the ppc has enough juice to be turned on, the backup battery should be at 100%, unless it is plugged in and you are just now turning it back on. Even so, it will probably still show 100%.
Basically, you left it on too long and all the batteries died. Sorry, but your data is gone :-(
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Their is noway to retrieve lost data on the workpad c3, unless you have it interfaced. Ounce the backup battery has been removed any stored data will be removed and the unit will come back to factory default.
Please see your users manual for complete details.
I'm sorry but the HP Ipaq 55xx series store data on a volatile ram based memory. Unlike a nand flash (like usb sticks, memory cards etc) this memory will hold data only as long as it's powered on. If your main battery gets empty you should still be able to retain your files for some 10-20hrs with the backup battery (if it's ok itself and not depleted). After this time the power to the ram memory is cut off and all data is lost.
The problem you face is somewhat related to that backup battery, as it appears it's unable to do it's job and maintain the power to the ram memory at least some 10 hrs. You should have that battery replaced.
There is no way to recover the data from the ram memory as it is stored as an electric charge over some memory cells in the ram chips. When there is no power, these charges dissipate and the pattern is lost.
Sorry to say your data was stored in ram memory and when the power is cut the data is gone forever, there is no way to restore your data from ram memory ones it no longer has any power.
now that it has power again the data will stay in there. So I recommend you use a memory card to store your data, as a harddrive so you wont loose your files. Remember to perform backups also so the device can be restored, incase another power failure.
The simple answer is.. i'm sorry to say it so simple.. no.
Here is why. PDA's have volatile RAM memory. This means that when the battery, back-up battery are completely drain out, they cannot keep up powering the RAM memory. When the power cuts off, everything in the RAM memory is lost.
The operating sistem and other files specific to it, doesn't get erased as they are stored separately in another kind of memory called ROM. This doesn't get errased when power drains out. The reason why PDA's doesn't have only ROM is because this type of memory is slow and the PDA will operate (read or write data to it) in the same slow manner. Therefore they use the RAM memory wich is faster.
The best advice I can give you now is never to let the main battery to drain out completely. Also regular back-ups of the data inside the PDA are usefull for situation where unexpected occur. Feel free to ask more questions and always remember to rate the answers provided from this site ;).
The back up battery should be replaced immediately upon seeing the message "Backup Battery Very Low - Your back up battery is very low or missing. Data loss may result from failure to replace the battery very soon. Consult the manufacturer's instructions for directions on replacing or charging the backup battery."
Warning: It is important to note that the back up battery in the MobilePro 900 is not rechargeable, thus, to prevent data loss, it is important to change the back up battery immediately when this message is displayed.
-are all pda's this way?
All PocketPCs are this way. I don't own a P**m so I can't speak to them.
-When the main battery depletes to the point where the unit shuts off how long do you have before data is lost?
Until the backup battery dies.
-Is the backup battery just used when changing main batteries or does it take over when the main battery goes dead? If so how long do you have before it is dead?
I've never had it happen, so I cannot say how long, but if you continue to try to use the PDA on the backup battery it won't be long (minutes) if it even lets you do that. The backup is there to bridge over battery changes and to act as a safety net if you run the main batteries totally flat.
-does the backup battery recharge or does it have to be replaced?
-with a fully charged unit how long can it be left off before data is lost?
Depends on the machine. Most of us leave the thing in the charger overnight every night, so this issue doesn't come up. You could try an experiment for 1, 2, 3 days, looking each day at the battery remaining and work up an estimate. I would expect maybe a week or more. Remember, even "off" the machine is still drawing power to maintain the RAM memory.
Did you check if the PDA was hot? My battery was totally dead one day when I picked my 3715 up, just to found out it was blistering hot (was turned off) and even the backup battery was empty.
Running fine now after hardresetting it, but still...