This Duracell 9V battery contains six mini AAAA batteries : r/mildlyinteresting
Duracell vs Energizer 9 volt battery. Are all 9V batteries the same?
Testing the 9V Battery Hack (or: Assault on Battery) – xkcd
Mega-Teardown: An Assortment of Alkaline 9V Batteries | Gough's Tech Zone
Duracell Coppertop 9-Volt Alkaline Batteries (4-Pack) 004133302963 - The Home Depot
AAAA Batteries from 9 Volt Battery... - Observations
AAAA Batteries – Blondihacks
Duracell Coppertop Alkaline 9-Volt Battery (2-Pack) 004133303961 - The Home Depot
Get Six 1.5V Cells From One 9V Battery (with Pictures) - Instructables
EEVblog #518 - 9V Alkaline Battery Construction - YouTube
Inside a 9volt battery is more batteries! - 9GAG
Battery Teardown To Get At The Cells Inside | Hackaday
Testing the 9V Battery Hack (or: Assault on Battery) – xkcd
Duracell Coppertop Battery Alkaline 9V - Each - Tom Thumb
Duracell Coppertop Battery Alkaline 9V - Each - Tom Thumb
Duracell - CopperTop 9V Alkaline Batteries - long lasting, all-purpose 9 Volt battery for household and business - Pack of 12 : Health & Household - Amazon.com