6.9.2 RTC battery backup kit
The optional battery backup kit for the RTC is provided with a lithium coin cell (CR2032 or
equivalent) that is fitted into a socket on the ST950 CPU Card. Without this optional kit the RTC is
maintained using Supercaps which will provide 48hrs of backup in the event of a power failure. If
the RTC is required to be backed up for longer periods, this kit should be used and the coin cell
fitted as shown below:
With the optional RTC battery backup in place the RTC backup period will be in excess of three
years. The recommended battery replacement period is three years
Ensure that the coin cell is correctly oriented – positive side uppermost as shown in the sequence
of photos below.
Empty holder
Slide the coin cell into the holder under the positive arm as shown below.
Cell partially in holder Cell fully in holder
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