Hi Malcolm, I had this problem a couple of years ago and it turned out that I was not using the latest version of the PIP or PVP instructions. Apparently if you are using the version that asks you to do the automatic test by resetting the clock back to a date of 2004 then what happens after is it "thinks" the battery has been in use for however many years and Writes that age back to the battery which suddenly reduces the displayed battery capacity. We had several do this and one defib replaced before Medtronic forwarded us the most current version of the PIP instructions which are Titled Rev-H. In Rev -H you do NOT sent the year back in time when doing the automatic test?
Which PIP are you using?
Hope that helps
Cheers
Mike
