About a month ago I posted that my core suddenly began showing partial display, so I changed the batt to no avail. Then I read here that others have had the same problem and had to ship for repair back to Suunto. Today I just decided to put the same battery back in the watch and lo and behold it is working fine again! Naturally I had to calibrate everything but thats no big deal. We'll see how long it holds up this time, but for now I'm back to being a happy camper.