The Apple MacBook Pro 2011 uses an internal lithium-ion battery, and the specific part depends on your screen size. The 13-inch models carry roughly a 63.5 Wh pack, the 15-inch models about 77.5 Wh, and the 17-inch models about 95 Wh, all within the 10.8 to 11.26 V range. Common part numbers across the line include 020-6380-A, A1322557, and 661-5229. Because the same generation spans three sizes, check the A-number on the bottom of your case before ordering.

Start with your screen size (13, 15, or 17-inch) and the A-number printed on the bottom of the aluminum case. That A-number ties directly to a battery family, since the 15-inch pack looks similar to the 17-inch but is physically shorter. From there, match the part number, such as 020-5071-B or MA348LL/A, to your exact model. With 18 distinct part numbers covering about 77 models, the case markings are the fastest way to confirm a correct fit before you buy.

Replacement batteries for the Apple MacBook Pro 2011 range from $46.99 to $69.99. Where your model lands in that range depends mainly on screen size and capacity, since a 13-inch pack near 63.5 Wh is smaller than a 17-inch pack near 95 Wh. Part numbers like 020-6380-A and MC-MBOOK15 fall within this pricing. Confirm your exact model and A-number so you pay for the battery that actually fits your machine.

No, Apple MacBook Pro 2011 batteries are not freely interchangeable across the line. The 13-inch (about 63.5 Wh), 15-inch (about 77.5 Wh), and 17-inch (about 95 Wh) packs differ in capacity and physical size, and the 17-inch unit is longer than the 15-inch even though they look alike. With 18 distinct part numbers in this category, you should match the A-number on your case rather than assuming one battery covers multiple sizes or both the Early and Late 2011 updates.

The main difference is capacity and physical size tied to screen size. The 13-inch sub-series uses about a 63.5 Wh internal battery, the 15-inch about 77.5 Wh, and the 17-inch about 95 Wh, all lithium-ion in the 10.8 to 11.26 V range. The 15-inch and 17-inch packs are easy to confuse because they look similar, but the 17-inch is physically longer. Part numbers also split by the Early 2011 and Late 2011 updates, so two same-size models can still differ.

The battery part number and the A-number both appear on the bottom case of your Apple MacBook Pro 2011, and the A-number (for example A1286 for a 15-inch) maps to a battery family. Once the case is open, the battery itself is usually labeled with a number such as 661-5229 or 020-6380-A. Cross-checking the A-number on the outside with the label inside confirms you are ordering the right one of the 18 part numbers in this category.

Yes, the Apple MacBook Pro 2011 battery is internal but accessible, and many owners replace it themselves. You remove the bottom case to reach the lithium-ion pack, and a tri-wing screwdriver is typically needed for the internal screws. Match your screen size and A-number to the correct part, such as 020-5071-B or A1322557, before you start. Work carefully, disconnect the battery connector before lifting the pack, and keep the screws organized since lengths can vary.

Common signs include much shorter runtime than you used to get, the laptop shutting down unexpectedly even with charge showing, or the machine only staying on while plugged in. You may also notice the trackpad feeling uneven if a pack expands inside the case. Since these internal lithium-ion batteries run 10.8 to 11.26 V and 55 to 95 Wh, a worn unit holds far less than its rated capacity. If you see these symptoms, match your A-number to the right part, priced from $46.99 to $69.99.