Heavy Duty Batteries and Stompers

Does anyone know why batteries with a name like "heavy duty" are the least powerful you can buy today compared to the common alkalines and rechargables? If you need a battery for a remote control or a clock it sounds like a heavy duty will do, but unless you want your camara to puke out after 20 pics use higher powered stuff.

At one point long ago were "heavy duty" batteries the good batteries? How did they earn that name and why don't they have a new name now? Even back in 1980 when I was 10 years old the heavy duty batteries weren't any good.

This was all very confusing as a kid, because when you're 10 years old and wanting to win your stomper pull wouldn't you naturally reach for the "heavy duty" battery? It's like you'd think you're putting 93 octane in your machine, but in fact it's the opposite.

(Don't know why I just thought of stompers, but do you remember everybody wiring them up to 6V batteries anyhow with stripped out lamp wire, hooking lead tire weights to the front to hold the wheels down, and adding on extra cool tires for better traction?)