Battery Replacement on 4-year-old MacBook Pro
5 - 10 minuten
My old yet trusty MBP has served me well since Thanksgiving 2009. This computer still has some legs but two things plague it: short battery life and overheating. By replacing the old battery (which had 1000+ cycles, when Apple claims ~400 to be typical before death) I not only extended the computer's available time away from a charger, I also reduced the heat generated inside the computer and slightly improved performance.
Repair was very simple, provided you have a small Phillips screwdriver and a tri-wing screwdriver (I had to buy the latter -- which I did through Amazon). Unscrew the bottom of the laptop case with the Phillips, unscrew the battery with the tri-wing, and pop in the new battery. The computer automatically recognizes the new battery so there is nothing to do on the software end at all.
Provided you are not a complete novice in computer guts, I would recommend anyone with similar issues to do the same as I did. Perhaps not if your Mac is still within the warranty (mine is 4+ years old so warranty, schmarranty) which is voided by this action. Apple charges ~$130 to do this very same thing overnight at their stores, but if you're comfortable opening up a computer yourself, you can do it for ~$99 + tax + shipping.
Now what's next is replacing the optical drive with an SSD, porting my OS over to the SSD, and for ~$250 I will basically have a new computer that should run like the wind.