How do you change out the battery for Vexilar Pro pack?

[MidCoast]

My battery is bad for my Vexilar Pro Pack.  How do you change out the battery?  Is there a place I am suppose to open to take out the battery?

[rustysetter]

On mine I removed the outside cover and found the  access on the bottom of the plastic piece it's mounted on.

[Garett Svir]

If you take the screws out of the sides of the head unit and pull out of the way, you can access the screws below. Remove the screws, disconnect battery and you should be in business.