DS1302 For Help!

Hello, I am new.
The clock display screen I made with DS1302 and 12864, added a password, has the function of changing the password, and stored it in the DS1302 to prevent power failure. But how to write it in DS1302? After the power is off, is it possible to power the DS1302 alone?
I saw a video and details from this post …But I still need some practical advice.
Thanks !

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