I dropped a 9v battery & discovered there is actually 6 smaller batteries inside : r/mildlyinteresting
Amazon.com: DAIERTEK 10pcs 9V Battery Connector 9 Volt Battery Snap Clip I Type with 2 Pairs of Alligator Clips and 2.1mm X 5.5mm DC Male Power Plug : Electronics
Wholesale Jump Starter 9 Volt 12v Battery Car Cigarette Lighter Socket Charger 15A 30A Alligator Clip Cables From m.alibaba.com
Electric Lighter - How to Make DIY Electric Arc Lighter With 9V Battery - YouTube