I have the midland 75-779 that i bought about 20 years ago i just got it out of storage an wanted to see if it still works. I do not have the dc in plug adapter for it anymore so i tryed to put the 8 AA batteries but then i realized it takes 2 other batteries that i have no idea what kind they are as its not marked in there there [ 1 on each side ]is a brass colored metal strip in each one .... can anybody tell me what goes in those 2 slots ? a AAA don't fit in there ?