I will now impart you with the enlightenment contained in an interesting AA battery anecdote of mine. I used to buy these AAAs, or as most any battery so far as your appliances are concerned. What makes them different is they have more juice than smaller batteries and will last longer.
AA Batteries provide 1.5 volts powered'>toys. Rechargeable batteries are also available and are great for wireless video game controllers which eat up batteries. You will, though, need a charger.