Introduction
Replacing the battery in a Kwikset Home Connect 620 Smart Lock is a straightforward process that most people can accomplish at home.
This process presents little opportunity for injury. Even the most novice DIY-er should have no problems following the instructions and performing the repair.
Tools
Parts
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            Remove the three (3) M3 x 6mm screws that secure the faceplate using a #1 Philips screwdriver. 
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            Left side 
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            Right side 
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            Bottom 
 
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            Reattach the three (3) M3 x 6mm screws that secure the faceplate using a #1 Philips screwdriver. 
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            Bottom 
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            Right side 
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            Left side 
 
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                            Conclusion
                          
                          That's it! Your Kwikset Home Connect 620 Smart Lock should now be working properly.