[Elecraft] KBPF3 mod kit

[Dauer, Edward]

I just ordered the KIO3B and a KBPF3 mod kit for the K3.  The process of installing the KBPF3 mod provides access to the small battery under the plastic protective cover.  The K3 is about five years old.  Would it be worth replacing that battery while I am in there, or do they last essentially forever?  The mod will also require removing the Sub Rx.  As I remember, that was the most frustrating part of the original build.  I would appreciate any tips on how to remove and – especially – replace the Sub Rx with a minimum of cussing.  Would removing the right side panel help, or would that just complicate things?

Tnx,

Ted, KN1CBR