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Re: the battery backup is very low
Looks like either the devices connected to the backup battery are consuming too much power than that backup can handle or the backup battery is getting worn-off. You may need to change the batteries or take-off some load (remove some devices that consume power) from the backup battery.
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had this trouble myself. I discovered that the backup battery was slightly indented on the top, so it was not making proper contact. Swapped it for another and it was ok. I had tried lots of batteries, though, and surprisingly quite a few had this little dent just enough to stop the X5 recognising the batter.
another thing to try: if you remove the battery and look underneath, there are three tiny golden arms which make the contact. Make sure they are all slightly lifted at the ends. If not slide something flat and non metallic underneath and bend each one up gently. This helps ensure good contact.
I just had this happen to me yesterday. I fought with my phone for about 3 hours removing the battery and trying to restart it. It would take about 5 minutes for it to finally boot and once it did the touch screen would not work. So I did a hard boot and within 5 minutes my phone was back to normal. I lost all my contacts but I just did a restore with the backup software. To do a hard boot hold down the red and green buttons on the front of the phone and push the reset button on the bottom of the phone with the stylus. The reset button is on the right side of the power/usb plug. As I said my phone was back to normal in just a few minutes.
The h5450 comes with what HP calls a backup battery. It is built
into the device and not accessible by the user. However, the backup
battery has only enough juice to power the Pocket PC for a few minutes
while you change main batteries. Don't expect it to keep your RAM data
alive if the main battery runs out.
Install Active Sync latest version off of the Microsoft site. Turn off automatic SYNC ..... change it to manual sync.
Then check the connections on the watch battery----- you may need to add a piece of tape to the battery lid to get a tight connection. Carefully bend out the tab that contacts the battery. Wipe the battery off with a clean rag before installing.
The MobilePro 900 back up battery is low and should be replaced. The battery is a CR2032 coin-cell battery, which is very common and can be purchased at most department and drug stores.
Refer to section 1-7 of the "MobilePro 900 Handheld PC's User's Guide" for detailed replacement instructions.
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.