X60S Battery Maintenance

[mikealevy]

In the battery maintenance section (get there by double clicking the battery gauge on the bottom of the screen), it says: "If you primarily use your computer with the ac adapter attached and only infrequently use battery power, battery deterioration may occur faster if the battery is constantly charged at 100%. Lowering the charge thresholds for your battery and periodically resetting the battery gauge will help increase its lifespan."

So I set it for:
"Optimize for battery lifespan (automatically change for me)" (Notify me when thresholds change)

and,

"Notify me when reset is recommended" (for Battery gauge reset)

I then ran the battery down to about 20% and then recharged it, and it then recharged it to full / 100% -- does anyone know how it's suppose to work? Does it take a few discharge / recharge cycles before it automatically lowers the recharge thresholds?