Maybe in the old (think '95 or 96) IBM ThinkPad I have at home. Just about every laptop I see today has a Li-ion battery, or is at least advertised with one.
Ask anyone who owns a laptop and they will say the same thing: battery life sucks. Nearly everyone reports it is less than they thought it would be.
Can't say that my brother, dad or I have experienced this. We get just about what ours were rated for.