Here is the process to exchange the battery on HA700 control unit or detectors:
Step 1:
Check the status of LEDs status, if one of them is flashing you need to do this:
personal code + 1
personal code + 4
Step 2:
Enter to the test mode:
personal code + 03
Step 3:
Now , you can change your batteries without the siren ringing
Step 4:
When you finish, push on ( * ) to exit the test mode