In addition, lithium polymer batteries are not subject to the memory effect common with older battery technology. This battery features Lithium polymer technology inside the battery which provides longer run times with less weight. To replace this battery you need unscrew the bottom of the laptop to access the battery. For the Snap-in battery, go to our Apple A1286 MacBook Pro (2008) battery page. This battery is only compatible with the internal battery in MacBook Pros. If your battery snaps into place, this is not the correct battery. To further complicate things, if the model printed on the bottom of the laptop is A1286, there are two different batteries that use the same model number. Here you can find the battery for the next generation of MacBook Pro 15″ (early 2011-mid 2012). This battery is compatible with the model that was going out of production and the next generation was just coming into production. If your laptop was made in 2011, it is important to note that Apple produced two different generations of MacBooks. Additionally, check your MacBook’s manufacture date by going to the Apple Icon and selecting About this Mac. You can find the model number on the bottom of your MacBook. Check your model number and the manufacture date to make sure you order the right battery. Apple made two different generations of 15″ MacBook Pros in Early 2011 which take different batteries. Compatibility Note: This battery is only compatible with the MacBook Pro 15 inch laptop models listed on the bottom of this page, including models made between 2009 and Early 2011. This A1321 battery replaces the original battery found in 15″ MacBook Pros made between early 2009 and early 2011.
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