All the batteries in my house are either AA or AAA for just about everything like the flashlights, my digital camera and the alarm clock. But there are also C batteries and D batteries. But why are there not any B batteries? I checked on Wikipedia and found out that there a lot more batteries than that, and yes, as a matter of fact, they do have a B battery:
Most commonly found within a European 4.5 volt lantern battery. Not to be confused with the vacuum tube B battery.