At what percentage should I charge my Macbook

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: 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.

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).

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'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.