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Is it possible to tweak settings so that the battery will only charge up to 90% -95% and then use power adapter to run ?

A friend told me he was able to set such limits on his non-mac PC so I was hoping there would be a way to do it. From reading I have done online it appears this is better than having a 100% battery most of the time.

I have an MBP 13" 2012 running latest version of OSX ML(10.8.2).

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You might want to try using Watts - configurable reminders to calibrate your battery, take it off AC after too long, etc. I found it well worth the purchase price. –  da4 Oct 12 '12 at 16:57

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The logic for doing what you want is already hard-coded into the battery and its internal charging circuits. Not only is pretty much every laptop on the market today doing this, but I imagine it's not something you can change, either. (Commenting from personal experience, I've seen this behavior in every laptop I've owned or had loaned to me over the past 6 years-- Two Dells, two MBPs, and a Lenovo)

When it comes to proper care of laptop batteries these days, the only real advice that an end-user can take is

Store the battery in a cool, dry place when it's not being used, and don't heat it up while it's charging.

Yes, that means you probably don't want to use the laptop while the battery is charging.

Pretty much every other detail with regards to charging cycles or the implementation thereof have been gone over by experts that study batteries for a living, and are likely already tailored to your battery far better than any generic internet advice will give you.

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