Introduction
A quick guide to replacing the battery in a Buick key fob
This specifc guide was written for a 2019 Buick Key Fob, but should apply to most Buick Key's with push to start.
The battery is a CR2032
Tools
Parts
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            Using an opening tool/pick helps avoid damage, however you can also use the inner key to pry the two shells apart 
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            If using the inner key to pry them apart, just reinsert the tip of the key into fob and gently twist 
 
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            Slide a tool underneath the old battery to pop it out, the replacement battery goes in face down toward the bottom shell 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.