There is much more mercury in batteries than in CFLs. Proponents of CFLs say their mercury content is like the dot at the end of a sentence. I remember using a vise to squeeze drops of liquid mercury out of a dead 9 Volt mercury battery to improvise a mercury switch from a neon lamp.
Many bans are the result of well-meaning people with more enthusiasm than knowledge. A majority of the population can be led or misled by charismatic leaders with an unwise agenda. Incandescent lighting is superior to flourescent lamps in some applications, and inferior in others. Performance is sometimes more important than efficiency. The choice should be up to educated consumers, not to a few legislators.