In 5 weeks the clock became 1.5 seconds late. This is an accelerating rate of drift after the many stable months leading up to the previous calibration! The updated error has gone from -6.37 PPM to -6.85 PPM. Extrapolating the currently corrected error, this would be about 15 seconds late per year.
Battery is sinking noticeably too, now below the 3 V line at 2.998 V.