9v batteries can be daisy chained together to increase the total voltage : r/mildlyinteresting
How to Make 9v Battery Pack Using 18650 : 7 Steps - Instructables
Energy Density of 9V battery vs. AA batteries - Bald Engineer
78 9V batteries in series at 625V. - YouTube
Am I going to explode? The three 9v batteries in series is still an open circuit as the negative and positive are not connected. But what if I clip together to 9v