Fixed it less than 10 minutes.
15 - 30 minutos
My 33 months old macbook pro battery only lasts 2.5 hours.
It was very easy and it took me less than 10 minutes to replace my old battery. Good thing is my current capacity is 7138mAh and higher than its design capacity. This means I have a lot of battery capacity before it drop below 100%. Now my battery is more than good as new.
Only one problem is I forgot to order the special screw driver. It's a bit difficult to remove those three special screws without using the proper tool. I had to cut the sides of my smallest flat screw driver to be able to slot it in diagonally on the star shaped screw head.
My advice is you need to buy the star shaped screw driver to make your repair easy and faster.