Battery Health

[In Sams World]

So, ive had my Macbook 2 months now and until last night battery health was 100%, wake up this morning and it has dropped all the way to 91% !!! in one night!

Has anyone heard of this before?

Also ive heard of calibrating the battery how does one do this and what exactly does it do?

Much appreciated.

 

[scienide09]

Through the power of the Interweb, one can do all sorts of crazy things, including searching these forums or the Apple website for more information.

 

[khunsanook]

If you google "calibrate macbook battery" the first hit is exactly what you need

You should drain your battery at least once or twice a month to keep it healthy. My battery is at 83 cycles, 86 percent health. Battery monitoring programs are variable. This is my second battery. The first one showed ridiculously high health after 100 cycles, but would die with 10 percent charge left. Apple replaced it. More on recent battery issues...