Will not using battery in MacBook make it last longer? If I don't use my MacBook on a battery, does it mean that it will last longer?
I heard that when you have normal notebook from HP, Asus, Dell, Acer.... no matter if you use the notebook on battery or not... after 2 or 3 years it will be dead... lasting only like 30 minutes or maybe only 5 minutes... 
Is it the same with MacBook?
I have a MacBook which is 6 years old and it still lasts 4-5 hours.... The Macbook has not been used on battery in those 6 years. ;o)
Apple says that:


  Rechargeable batteries have a limited number of charge cycles and may
  eventually need to be replaced and disposed of.


Naturally, if the battery has not been connected, no charge cycles have passed.