User's Manual Part 1

3.1.2. Calendar/Clock Battery
The SuperM.O.L.E.® Gold Profiler has another battery that powers an internal calendar
and clock. This battery is not rechargeable and has no status indicator. The expected
battery life is about 2-3 years.
If the calendar and clock does not seem to operate (it resets itself), the battery
may be discharged. For information on replacing the calendar/clock battery
refer to topic Service>Changing the Calendar/Clock Battery.