I have upgraded from PCM-M1 to Mictrotrack, and I have bought a 5 Gb Seagate Microdrive.
Here are the battery tests for the unit I've bought:
Taping at 24 bit 96 Khz:
57 minutes (2 Gb limit)
+ 57 minutes (2 Gb limit)
+ 14 minutes
Total: 2 hours 8 minutes
Taping at 16 bit 48 Khz:
2 hours 36 minutes
Taping at 16 bit 44.1 Khz:
2 hours 35 minutes
Do you think this is the standard battery life for the Microtrack?
I am a bit, just a bit, disappointed. I know I would get problems only at a Bruce Springsteen show

Do you think it's the Microdrive that sucks more battery?
I have yet to test a Compact Flash card, I was wondering what is your experience. Please let me know, thanks!