Something just to my menu settings on my PD150. Every time I take the battery off, I'm having to reset several settings in my menu including Clock Set, Rec Mode, Audio Mode, Mic NR, Rec Lamp, to name a few.

The only thing I did recently was try a new memory stick (Magic Gate), which didn't work.

Is there an internal battery that needs changing?

Yes, it is buried under one of the panels. There is a set of instructions somewhere, either on this forum (do a search here) or on the Internet (use Google).

Thanks a ton!

I found the answer on page 157 of the Sony PD150 manual.