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.