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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 managed to get enough solvent under all the cells to pry them up and out of the chassis, you can start working your way from the chassis center towards the front edge. The whole pack is somewhat clamped in under some screw mounting domes which hold the bottom case in place.

Once you have the pack out, you need to mechanically stabilise it, its six cells are only connected by the wires. Only center cells have a plastic frame keeping them together.

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.

@MacLemon
At first glance I thought you had the COVID vaccine there :blobfoxsipowo:

@ultem Nope, that's just a standard sealed bottle with a rubber membrane. They're used everywhere for delicate liquids, like solvents, chemicals, vaccines, etc. Nothing fancy, but you may not be used to seeing these. :-)

@chpietsch Pentalobes are an uncommon type of screw head, that Apple somehow likes to use a lot to keep people out of devices. Simply by the fact that most people don't have the right screwdrivers for them. They're also pretty delicate.

They look like a flower petal and since they're usually tiny where used, they're also often mixed up with the quite common Torx.

You can read up on them:
en.wikipedia.org/wiki/Pentalob

@MacLemon
Where do you source replacement batteries? I wanted to suss out a trackpad cable once, took one look at all those batteries glued in there, and over the top of the trackpad cable, and put the thing back together. Oh well :-/

@Funkpirata That heavily depends on the type of part needed.
You can just buy 3rd party batteries for most Macs, especially when they‘re a few years old. Depends on the machine how involved a replacement is.

As for special internal cabling, it‘s either harvesting from zombies, AliExpress (eg. fans), or authorized Apple repair shops who you partner with.

We certainly need a that forces Apple (and every other company) to provide the necessary info for free and sell spare parts.

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