Changed the battery in my polar cs400 and has now locked the settings mode.Anyone know how to unlock it?

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For CS400 you must do factory reset:
1) Hold all 4 buttons (2 left side, 2 right side) down until "everything is illuminated"
2) then press and release left-down button and after that press and release right-upper button (it must be done fast, lets say in 1 second)
3) if you got service menu, then use right side buttons to navigate to "Reset to default". If no service menu, then repeat 1. and 2.
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