How To Make A Toy Boat Propeller How To Hook Up A 9 Volt Battery To Two 1.5v C Batteries To Achieve 12 Volts.?

How to hook up a 9 volt battery to two 1.5v C batteries to achieve 12 volts.? - how to make a toy boat propeller

I try not to ask a transformer 12v fan to good support for a toy boat (, lol) I need to know how I can make it to connect securely and efficiently. Please give us the details!