Casio IT-2000D - Manual (Page 37)

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2.2.6 How to Replace or Recharge Batteries
Replacement of Batteries
The method used to replace the main battery, sub-battery, and SRAM card battery are explained
here. Failure to observe the correct battery replacement procedure may result in a loss of data.
Always observe the following steps in battery replacement.
Main battery replacement

Hold down the Power switch for more than one second to turn off the main unit power.

Make sure that two sub-batteries are installed, then open the battery compartment lid.

Replace the fully charged main battery, the close the battery compartment lid.
Note:
Make sure that both sub-batteries are installed. If either of the sub-batteries is not installed,
the data may be lost.
Do not open the battery compartment lid while the power is on. If it is opened accidentally, an
emergency alarm sounds. In case such the event occurs, close the lid at once.
Sub-battery replacement

Hold down the Power switch for more than one second to turn off the main unit power.

Make sure that the fully charged main battery is installed.

Replace the primary sub-battery (button-type lithium battery) with a new one.
Note:
Make sure that the main battery is installed. If the primary sub-battery is removed without the
main battery being in place, data will be lost.
The secondary sub-battery (button-type lithium-vanadium battery) does not have to be replaced.
SRAM card battery replacement

Make a backup of the SRAM card on the F-ROM drive or on some other device.

Remove the SRAM card from the PC card slot of the main unit.

Replace the battery of the SRAM card.

Insert the SRAM card into the PC card slot.

If the data has been lost, format (refer to Chapter 2.3.6 “PC Card”) the SRAM card then
restore the data on it from the backup device.