MacBook Unibody Model A1342 Battery Replacement · the battery connector up out of its socket on the logic board. It may be easier to use your fingernails to lift up on both sides
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Remove the eight 4 mm Phillipsscrews securing the lower case tothe MacBook.
Step 2
The lower case is constructed of rubber-coated aluminum. Do not excessively bend the aluminumduring removal, as any permanent deformation will cause tolerance issues after reassembly.
Slightly lift the lower case near the vent opening.
Continue running your fingers between the lower and upper cases until the upper case pops off itsretaining clips.
The location of these three clips is shown in the third picture.
To reassemble your device, follow these instructions in reverse order.
Step 7
Use the battery's plastic pull tab tolift and remove the battery from theupper case.
If you're installing a new battery, youshould calibrate it after installation:
Charge it to 100%, and then keepcharging it for at least 2 morehours. Next, unplug and use itnormally to drain the battery.When you see the low batterywarning, save your work, andkeep your laptop on until it goesto sleep due to low battery. Waitat least 5 hours, then charge yourlaptop uninterrupted to 100%.
If you notice any unusualbehavior or problems afterinstalling your new battery, youmay need to reset yourMacBook's SMC.