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I just changed the battery out of my Cobra Dynamic.  old style black brick.  My favorite mic.  I use it on the base.  I have to buy batteries last week for some red dot sights.  i was at the local Batteries Plus.  I got there last 7.5 volt little can.  The one in the Dynamic was till running, but I had never replaced it.  No markings on the one I had been running and a light green tint.  I think it may have been the original from Cobra.  They do not make things like the used to.