Power mike question

I have to replace the mike on my mobile unit and I have a brand-new Cobra power mike laying around and was thinking about using it. The original mike was not a power mike. Not sure where/when/how I obtained the power mike but I must have paid something for it once upon a time and it would save me from buying another mike if I'm able to use it.

My radio is one of those Northpoint export radios with a few extra watts output (35 I think on hi setting).

My question is this: Are there any risks of screwing up my radio with a power mike? Never used one before.

Also is a battery mandatory. ie would the mike work as a conventional mike if a battery was not installed?

 

Thanks. I only asked about the battery because I wondered what would happen if the battery went dead and I didn't have a spare onboard.

I tried the power mike but evidently it is wired different than the Cobra mike I was using, although both mikes are Cobra. I used to have the time and patience to tinker with stuff like that but now I don't so I just turned around and ordered the same model Cobra as the one that went bad The old mike lasted about 7-8 years so i figured what the hey