The Apple MacBook Pro 5.5 uses an internal lithium-ion battery built on the A1322 design, with common part numbers including 661-5229 and 020-6380-A. It is rated near 10.95 V and falls within the line’s broader 10.8 to 11.26 V range, with capacity in the 55 to 95 Wh span. Because it is an internal unibody battery, you access it by removing the bottom aluminum case rather than releasing an external latch. The price is $69.99.

Match your exact model identifier and the printed battery part number before buying. The Apple MacBook Pro 5.5 line covers about 77 configurations served by 18 distinct part numbers such as A1322557, 020-5071-B, and 661-5229, so similar looking units can take different batteries. Check the model details in the About This Mac screen, then read the part number printed on your current battery once the bottom case is off. Confirming both the model and the part number is the surest way to order the correct replacement.

Replacement batteries for the Apple MacBook Pro 5.5 are priced at $69.99. That single price covers the lithium-ion options across this line, which run from about 55 to 95 Wh and 10.8 to 11.26 V. With 18 distinct part numbers available, including 020-6380-A and MC-MBOOK15, you pay the same listed price regardless of which exact part your configuration needs, so your job is to match the part number rather than weigh different price tiers.

Not universally. While the Apple MacBook Pro 5.5 is a single generation built around the A1322 internal battery, the broader category spans 18 part numbers and about 77 configurations, so a part that fits one unit may not fit another. Both CPU tiers within the Mid 2009 model (2.26 GHz and 2.53 GHz Core 2 Duo) share the same internal layout and battery requirement, but you should still verify the printed part number such as 661-5229 against your machine before treating any two as interchangeable.

The Apple MacBook Pro 5.5 is essentially one sub-series, the 13-inch Mid 2009 model, so the main variation comes from CPU tier and the specific part number stamped on the cell. The 2.26 GHz and 2.53 GHz configurations use the same internal layout and the same A1322 based battery, rated around 10.95 V. Across the wider catalog, voltages range from 10.8 to 11.26 V and capacity from 55 to 95 Wh, which is why part numbers like 020-5071-B and 661-5229 must be matched exactly.

The part number is printed directly on the battery itself, which sits inside the unibody chassis of the Apple MacBook Pro 5.5. Remove the screws on the bottom aluminum case to lift it off and read the label, where you will see a code such as 661-5229, 020-6380-A, or A1322557. You can also note your exact model from the About This Mac screen first, then cross-check it against the printed part number to confirm you are ordering the correct one of the 18 available.

Yes. The Apple MacBook Pro 5.5 is well regarded for repairability, and swapping the internal A1322 battery is a manageable do-it-yourself job. You unscrew the bottom aluminum case, disconnect and remove the old battery, then seat the replacement (rated near 10.95 V) and reconnect it. Because this is an internal unibody battery rather than a latch-release type, having the correct screwdrivers on hand helps. Confirm the part number such as 661-5229 before you start so the replacement matches your machine.

Watch for rapid charge loss, a unit that shuts down well before reaching zero, or one that runs only while plugged in. On the Apple MacBook Pro 5.5, a battery originally rated for roughly 58 to 63.5 Wh that now holds a fraction of that is a clear signal. A cycle count near or past its service limit, shown in System Information, also points to replacement. If your machine no longer holds a usable charge, a fresh lithium-ion battery at $69.99 restores portability.