MBP 13" Late 2013 Retina Battery Replacement

My Problem

Battery performance was reduced. My MAC was barely making it 3 hours.

My Fix

Repair was fun, except for 2 things: The guide mentions screws to be removed from the battery frame: I found they are plastic plugs instead and it was easy to remove them, but not possible to put them back. I hope they are not stuck in the fan one day. The second hard part was the iOpener: It takes so much patience and handy work to remove the old battery from the computer body. I had to heat the iOpener 3-4 times before peeling the batteries off.

My Advice

Be careful where you put the speakers because they have magnets and they can hide tiny screws inside; and check if you put all the screws back before you close the computer for good (i forgot one speaker screw out) Step 3 in the manual was not required.