David and all, The battery in the K3 is ONLY for keeping the Real Time Clock alive, and will last a very long time. The memory does not need a battery. 73, Don W3FPR On 12/19/2019 1:03 PM, David Robertson wrote: > There is a battery in the K3. It is a coin cell for keeping memory alive. > If the battery gets low the K3 might indicate a low battery. >