Can a 9v E-sized battery connected in a series with a AA/AAA battery be used to run a remote control car that usually runs on 10.5v (8x AA/AAA)? - Quora
Testing the 9V Battery Hack (or: Assault on Battery) – xkcd
This Duracell 9V battery contains six mini AAAA batteries : r/mildlyinteresting
9v battery hi-res stock photography and images - Alamy
Can you make a 9-volt battery out of AA or AAA batteries? - Quora