Is your feature request related to a problem? Please describe.
I want to have my battery at 80%, but since there is the possibility to check even if the computer is closed (the MagSafe LED), I don't want to miss it out using battery

Describe the solution you'd like
Whenever the battery reaches 80% (the charging limit) the MagSafe LED should turn green

Describe alternatives you've considered
Opening the MacBook (but impractical)