You may have heard, or experienced for yourselves that Macs aren't the most easy to repair.
Here's how you replace the battery in a MacBook Pro 15", basically any model with a retina display.
Detailed explanations are in the image descriptions.
Basically you open the MacBook Pro with a Pentalobe. Wearing Eye and respiratory protection, and for good measure, nitrile gloves always look fancy, you apply solvent under the battery cells with a needly and syringe.
Applying the toluene in between and subsequently under the battery packs takes some time. You basically apply the solvent to one side of each cell, while keeping the computer tilted so it will flow under the cells and reach the glue strips which hold the batteries in place. About 0.5mℓ per cell is enough.
Once done from one side, you spin the MacBook Pro around, rinse and repeat from the other side. This process takes some time, because the glue needs some soaking to losen.
Once you have removed all the goo and glue and cleaned up the battery compartment you can prepare the replacement battery pack for insertion into the chassis.
The new battery pack comes with plastic foil attached to both sides, top and bottom. This is needed so you can handle it without breaking the cell connections. Once you peel the foil away, it becomes flexible and flimsy which isn't really helping with aligning the connector and screw holes.
This concludes replacing a glued in battery pack in your MacBook Pro which takes about an hour. To calibrate your system to the new chemistry charge up to 100%, let it run down until it goes to sleep on its own and recharge back up. This ensures a proper time left estimation.
While you're waiting for that, properly dispose of all the chemicals, and the old battery pack. They MUST NOT go into your trash!
Clean up your working area and tools and you're done.
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