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Test your new battery's fit and alignment carefully before installing it.

Unlike most laptop batteries, the MacBook's battery is precisely contoured to fit the "terraced" shape of the lower case. Each cell must be correctly positioned, or the MacBook may not close correctly and damage may result.

Your replacement battery may come affixed to a thick plastic top liner to help keep the individual cells in position as you install it. Don't remove this liner until after the battery is installed.

If your battery came with adhesive pre-installed on the bottom, peel away the bottom plastic liners to expose the adhesive. If your battery did not come with adhesive, apply a thin double-sided adhesive tape such as Tesa 61395 to the lower case in the areas marked in red.

Carefully position the battery and set it into place. Press and hold each cell firmly for 5-10 seconds to secure it to the lower case. Afterward, peel off the plastic top liner along with any foam padding.

2015 models only: After reassembly, remember to connect your MacBook to low-voltage power before turning it on. Failure to follow these instructions may result in logic board damage.

Calibrate your newly installed battery: charge it to 100%, and keep charging it for at least 2 more hours. Unplug and use it normally to drain the battery. When you see the low battery warning, save your work, and keep your laptop on until it goes to sleep due to low battery. Wait at least 5 hours, then charge your laptop uninterrupted to 100%.

If you notice any unusual behavior or problems after installing your new battery, you may need to reset your MacBook's SMC.

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