Although straightforward, I'm still proud of how I replaced the "un-replaceable" battery of my 4-year old Nexus 5 (still in mint condition). /me even made an opening pry "tool" by cutting an eraser holder into two[+], which worked perfectly well. (Still have to install Lineage OS, though, as Google stopped security updates.)

[+] https://kashyapc.fedorapeople.org/Eraser-holder-turned-openi...