I still use the Futaba Attack, and old Airtronics radios too. I had to change batteries on all of them. One had the nasty black wire syndrome, and I have junked two for parts, as the sticks broke. I consider my DX 7 as my newest. I just use it for indoor stuff pretty much. I was not aware of the clock battery. Hope that is not a serious problem. I had to change the main 8 cell battery in that one too.