[leedega]

I too have a DELL Axim X3 PDA with a dead "backup" battery. Technically the backup battery on this model is not classified as "user replaceable" because you have to take your whole axim apart to replace it (unlike some other models like the X5 which I believe takes a standard watch-like battery (CR2032) and just slips in a socket on the back of the unit (no hardware disassembling required).

You are correct when you say that the battery you find when you take apart the unit is encased in plastic with 2 wires coming out of it. This is a custom battery designed for this axim with a special connector to plug it in.

There are basically two ways you can still replace this battery. The first way which may be the easiest but probably the most expensive is to simply purchase a new battery. I don't believe DELL sells them (since they classify them as non-user replaceable) but several third parties do sell them (just do a Google search for dell axim x3 backup battery and you should find some). This would involve just taking the PDA apart (which it sounds like you already have), then pulling out the old battery and simply plugging the new one in.

Alternatively you can purchase the battery by itself (I think several manufacturers make them and you may be able to find the odd one on ebay as well). This is a bit more work because what you have to do then is remove the old battery, rip open the plastic seal, pull the wires off the old battery and attach them to the new battery (either via solder or maybe some electrical tape might do). Then replace the battery and voila. It is important to make sure you get the right battery too since the wrong one could (in the worst case) toast your PDA, or (in the best case) just not work right and be worthless. Take the old one apart and see what the part number is on the battery. Mine was a V20HR. Just google the part number and see what you can find.

I hope this helps.

DISCLAIMER: It is very easy to toast your PDA in a multitude of ways by doing either of these replacements so be careful (I'm not going to be held responsible for any mistakes you may make!).