A lot of discussion lately regarding our XF batteries and when to replace them. I have a Battery Bug by Argus (Battery Monitors) that I use on my Goldwing to monitor the overall health of the battery. It provides a continues readout of voltage and a percentage of battery life left and provides a warning beep when it's time to replace the battery. I'm thinking about ordering and installing one for the XF. They make several different type depending on application.
I'm not affiliated with this company in any way, but am impressed with their product.
http://www.argusanalyzers.com/index.php?id=15