Hi Geoff, I have a K3 of similar vintage. When I upgraded to KSYN3As, I just replaced the coin cell while it was exposed with the sub-RX removed. At the time I replaced it, the cell was still going strong.
Most of the CR series coin cells from around 2007 survive on the order of 10 years (shelf life). I think that this lifetime is generally longer now, but it varies by manufacturer. The cell I put in was rated to be good until 2025. I've used CR series cells in applications where they lasted 15 years. 73, matt W6NIA On Sat, 18 Jul 2015 18:28:49 +0100, you wrote: >In the next few days Ill be taking apart my trusty K3 #266 to install K3SYNAs >and do KBPF3 mods. As its seven and a half years old I could also replace the >clock battery while I have it exposed or I could leave it to see how long it >keeps going. Has anyones K3 clock battery run down yet? Any views on how long >it should last? > >73 to all, > >Geoff >G3UCK >______________________________________________________________ >Elecraft mailing list >Home: http://mailman.qth.net/mailman/listinfo/elecraft >Help: http://mailman.qth.net/mmfaq.htm >Post: mailto:[email protected] > >This list hosted by: http://www.qsl.net >Please help support this email list: http://www.qsl.net/donate.html >Message delivered to [email protected] Matt Zilmer, W6NIA -- "Always store beer in a dark place." -R. Heinlein ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]

