Actual Size

• Motorcycle batteries are generally much smaller than car batteries because they are required to fit in a smaller vehicle and perform a smaller task.
  
  

Power Output

• Motorcycle batteries range from 6.5 amps an hour to 12 amps an hour, while car batteries range from 12 amps an hour to 36 amps an hour. Car batteries help cycle the vehicle and power the accessories, while motorcycle batteries are required mainly just to start the engine. Once a motorcycle's engine starts, the magneto, much like an automobile's alternator, creates enough electricity from the engine cycle to power the motorcycle's lights, fire its spark plug and power any accessories. Some larger motorcycles, however, have a small alternator and require a battery to keep running.
  
  

Cost

• Motorcycle batteries are generally cheaper than car batteries simply because they are made of less material and require less acid. They can run anywhere between $40 and $100. Car batteries cost between $60 and $200.