Instruction Manual

22
Backup Battery
Since the data is stored on the SDHC card (Class 10), there is no need a backup power source for data
retention.
The main unit has a built-in rechargeable battery for clock operation.
This battery is automatically charged when the rechargeable battery (RRC2020) is inserted.
Please note that the date and time will not show correct values if the clock battery runs out.
After the main unit has been turned off for a long period, check the date and time for correctness after
power-on.
If they are not correct, refer to “3-6 Date and Time Adjustment” on p. 25 for instructions on how to set
them.