When I started R/C cars the standard sub-C nicad was 1200 mAh / 1.2V for 1.44 W-h. With a six-pack and a brushed electric motor we geared the cars to run flat out for four minutes plus a lap. There were 1700 cells but everyone agreed they were basically too finicky to use except for pro racing.
Now these cells are like 10 Wh and they're smaller! An R/C car can be run until you get bored or break it. Just amazing.
I'm seeing that the cells that don't live up to the rated capacity are actually fake and you can tell by weighing them.
Example:
How to Know a Fake 18650 Battery - All