Siemens SIMATIC S7 System Manual page 56

Installation
3.3 Installation and removal procedures
Note
The CPU models CPU CR20s, CPU CR30s, CPU CR40s, and CPU CR60s do not support
the use of expansion modules or signal boards.
Installing or replacing the battery in the SB BA01 battery board
The SB BA01 battery board requires battery type CR1025. The battery is not included with
the SB BA01 and must be purchased.
To install the battery, follow these steps:
1. In the SB BA01, install the new battery with the positive side of the battery on top, and the
negative side next to the printed wiring board.
2. The SB BA01 is now ready to be installed in the CPU. Follow the installation directions
above.
To replace the battery, follow these steps:
1. Remove the SB BA01 from the CPU following the removal directions above.
2. Carefully remove the old battery using a small screwdriver. Push the battery out from
under the clip.
3. Install a new CR1025 replacement battery with the positive side of the battery on top and
the negative side next to the printed wiring board.
4. Re-install the SB BA01 battery board following the installation directions above.
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System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART