As a follow up, I installed the new Yuasa YTX12-BS yesterday, since it is coming out of storage now. I commissioned the battery by adding the acid pack on 04-Mar and it was on a trickle charger for 6 days to ensure that it was fully charged and holding it. I used a Dremel with the wire brush attachment to polish up the wiring connectors to ensure a good connection, as well as, some spray protectant after the install. The bike started right up without any hesitation.You are likely in a similar situation as me with my '12 Bonnie SE. While my original battery showed a good voltage while resting, it has only 87 CCA of the rated 180 CCA available. I was able to get the bike to start with a portable battery jump, which I believe narrowed things down to a weak battery. I have already purchased another Yuasa YTX12-BS and will commission/install it in the spring when the Bonnie comes out of storage. Hopefully, nothing else is the matter, but this forum has considerable posted info on it already to troubleshoot, if needed.
I had the dreaded click when attempting to start last November just before placing into storage. There wasn't much of a discernable warning before going from starting to not starting. It was the original battery and I am pleased to have got seven years out of it.