At what percentage should I charge my Macbook

Jackkcc, greetings: If you have AC available, there is no advantage of cycling your MBP that way all the time. All you are doing is adding unnecessary cycles to your MBP. A partial monthly discharge will be sufficient to keep the lithium ion battery happy. The battery is there for the situations where you do not have AC available.

Ciao.

As OGELTHORPE says. Also never let your macbook battery drain below 20%, always plug into the AC power if the battery gets to 20%. Ideally you should let the battery drain to 40-60% once every month so that the electrons in the lithium battery move about; otherwise I keep mine plugged in as I use my MBP as a desktop replacement. If you do let it drain to say 50% each month that means the battery will go through 1 full cycle every 2 months or 6 per year. The fewer cycles the better, but sooner or later you will have to replace the battery, as it is only designed for 1000 cycles.

Jackkcc, greetings; As I said "If you have AC available" and since you don't, "The battery is there for the situations where you do not have AC available.".

Then your doing it correctly. 🙂

Ciao.

I keep mine attached to AC as much as possible. The OSX will NOT allow the MBP to be overcharged so that should not be a concern. Once a month, I will use it under battery power and let it reach the 40% level and then back to the AC.

Here are Apple battery article that you may find useful:

http://www.apple.com/support/macbookpro/batteries_power/

Ciao.

I use my MacBook every day for work and what i find is if you start with 100% battery then let it run down to 15% - 20% then let it charge while you finish your work then before you know it is back up to 100% then you can repeat the process again (run it down to about 15% - 20% then charge while finishing up).

I'm not at my office all day i travel. So when i do get to my office i do plug my MBP in but when i get to my office my battery is on average at 10%-20% battery power.