Ok sorry about that guys, let me re-word that. I wasn't actually doing the driving. I should have stated I was on a bus on my way to work (didn't even realize I said I was driving to work)
The impression that I have been getting through a number of threads in various forums is that the Microdrives, with their moving parts much like a hard drive, will drain a significant amount of power when being accessed constantly for any periods of time (such as listening to MP3's), especially while using the device for other functionality at the same time. This apparently is especially true of the older MD's such as my 340 MB card which drain more power than the newer 1 gig Microdrives.
The reasoning for this post is more that I wanted to confirm my suspicion that this sudden appearance in battery drain had more to do with me listening to MP3's off a microdrive then had I been listening to them off a Secure Digital card or standard CF card, as well as eliminating the possibility that my Axim was defective.
Like I said I have been more than happy with the batteries performance otherwise. This morning, while on the bus (not driving of course ;) ) I was again reading web pages from the avantgo service off of Pocket IE and in an hours time I was still at 94%. This sounds more like it. I think the Microdrive has got to go to make way for a SD or CF card.
BTW my SD card is on the way. Viking 128 MB (Stay away from Sandisk, I have not heard good things, even though with its pricing it is very tempting)