Z.....you are not doing anything wrong. It appears he was describing how to change out or replace an older smoke alarm.....not just a battery. You are indeed correct that it is that simple to replace the 9 volt battery. You just open the door and stick a new one in, making sure you are installing it in the same orientation as the old one.
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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