Really? That's the first time I've ever heard that... I'll keep an eye on the battery meter from now on to make sure the battery doesn't fall below 30%.
Also I'm not sure if you had the time to do a clean installation of Windows yet but I finally got HP's CoolSense to work properly after a clean installation. It's not much quieter now since the dm1z only stays in the 'Quiet Mode' profile but even under 'Quiet Mode' the fan noise is still subtle.
Actually, I haven't had a chance to do a clean installation yet. I've been looking for an external DVD writer so that I can make an HP Backup disk. In fact, the reason why I wanted to do this is because I like the CoolSense program a lot! Now that you noted it's not working properly with a clean installation, I'm hesitant to do anything. Mine is currently able to use all 3 settings.