VZW TP2 - No Warning When Battery Is Low?

[DLCPhoto]

I've been using my TP2 a fair amount - just got it, still learning, playiing, etc. - so I've been running down the battery fairly quickly. A couple of times, it apparently just ran out completely and turned off. As far as I know, there were no audio notifications, vibration, etc. I had put it to sleep, and was in my front pocket both times this happened.

I looked completely through the User Manual, and saw no mention one way or the other about whether or not this is the way it's supposed to behave.

Anybody with any insight on this? I'd prefer to be able to get an audible warning so I could plug it on, etc.

Thanks!