As some others have indicated with their units, I too have the problem where the backup battery shows full charge, but if the main battery is removed even momentarily it will not maintain the memory and starts up in the calibration mode again.

I disassembled the unit and found the backup battery located on the smaller PCB just behind the front buttons. You have to remove the back cover, and then the main PCB to get to it. BE CAREFUL if trying this, as there is the ribbon cable connecting the LCD panel to the PCB, and a connector between the two boards, and it isn't easy to remove the main board because of these and having to maneuver around the side wheel and bottom connector that are externally exposed through the side of the outer plastic assembly. This may not be something to try for those not experienced with dealing with electronics.

Now for the (potentially) bad news. This is a rechargeable cell, and not sure how a replacement can be ordered. It has a lead frame spot welded to it to connect to the PC board. I measured it and it measured up to ~1.3V (good level?) and a quick current test on it showed almost 0.5A (should be more than adequate), so I am not so sure it is the battery but hopefully. The reference designator on the PCB for that battery is "B1" and the battery has a marking on it of "064". Perhaps that would be useful in case anyone wants to try to order a replacement somehow.

If anyone does find an available replacement, please post the info for others to benefit from.

newfib

h8py said:thrillho said:I bet its the same type (or the CR2032), but there's no way to get to it without opening up the case.
I opened up the case but found that it doesn't use coin battery. Any one have idea how to replace backup battery?

Ok, I disassembled my waypoint again and foundthe backup battery. Just like newfib said, it is in the smaller pcb. I also took the battery out and found it's model is:
VARTA V20HR. I have no luck locating seller this in the US. Anyone?

EDIT: found one HERE; And a cheaper one HERE

Just placed my order with MOUSER because of their price. I don't know if it comes with solder tabs or not. I sure hope so. Otherwise, I'll have to figure out how to put it back. Wire mayb?

JamesD1343 said:anyone find an ext rom unlocker to kill all these apps on here?
Not sure if this is what you're looking for?
Linky

The dumprom tool in xdadevelopers.com can dump xip.bin file (the latest waypoint ROM) to folds and files.
But I did not find any working ROM editing tools. If I can make the ROM pretty small to free up more memory, I will be satisfied with WM2003.

JamesD1343 said:hm close im really looking for a tool to clear the flash in teh unit so that a hard reset wont install all the extra junk that it does...ie waypoint software, ms reader...on my xv6700 i installed one of the kitchens and there was a rom wipe util in it.

ruggerscoot said:I got the $28 card from Newegg. I can't get this card to work, I plug the card in, it says "Unrecognized Card" I tryi to run the Prizm Settings and WLAN status Icon and it says "Unable to connect to the wireless NetCard is it inserted?" It is...I don't know what to do at this point. Any ideas?

Did you Download the cwb1000 Dell_x5 drivers from here and install them from the PC before plugging in the card?

Here is my experience of replacing the backup battery so far.
I purchased from MOUSER and received the battery without solder tab. Since I don't have welder, I can't use it.
So I purchased again from Battery Specialists with solder tab. Soldered it and charged it until backup battery is 100%.
Then I took out the primary battery for 10 seconds and put it back. All of settings are gone and I have to go through the screen adjustment again. So I don't think this replacement works for me.
One thing I don't understand is that after I put the primary battery back, the backup battery is still 100%. So it seems that the backup battery DOES CHARGE, but it doesn't supply power when backup battery is missing. The manual says it should provide power for at least 5 minutes when there is no primary battery.
I feel bad for spending more than 10 dollars for the batteries and not making it work.

Has anyone managed to load Windows 5.0 or 6.0?

I bought the PDA only and would like to ditch the GPS software to give me more memory. Has anyone done this?