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A1321 Apple MacBook Pro 15 Replacement Battery 10.95V 7200mAh

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From $130.99 USD $158.99
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Replaces Apple part A1321, 661-5211, 020-6380-A for MacBook Pro 15 inch 2009 Unibody models.
10.95V at 7200mAh capacity restores full charge cycles to aging 2009 unibody chassis.
Connector slides straight into the internal slot with no locking tab — seat until flush.
We bench tested the cell against the original A1321 form factor; BMS accepted charge immediately with no fault codes.
After installation, discharge fully to hibernation cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

10.95V

Amp

7200mAh

Apple MacBook Pro 15" Unibody 2009 — 10.95V Li-Polymer Replacement Battery (A1321)

This is a 10.95V, 7200mAh Li-Polymer battery for the Apple MacBook Pro 15 inch Precision Aluminum Unibody 2009 models, including the A1286 chassis and MC118LL/A SKU. It fits the 15.4" 2.53GHz Core 2 Duo configuration and replaces OEM part numbers A1321, 661-5211, 020-6380-A, and 661-5476. Capacity on this cell matches the original spec at 78.84Wh.

  • A1286 chassis compatibility: All 2009 MBP 15" Unibody variants share the same six-cell Li-Polymer stack, battery connector pinout, and SMBus communication line — the same physical cell and BMS handshake covers the full model range listed here.
  • Bench tested on actual hardware: We ran this cell on an A1286 board. The SMBus negotiation completed without fault codes, the BMS reported correct voltage at each charge threshold, and the charging circuit stepped through trickle, CC, and CV phases without interruption.
  • Post-install calibration on the 2009 MBP: After fitting this cell, run the laptop on battery until it reaches hibernate cutoff, then charge uninterrupted to 100% without sleep. This resets the SMBus fuel gauge IC learn cycle against the new cell and clears the "Replace Now" health warning that macOS displays after every cell swap.

Why the A1286 shuts down at 20–30% after a battery swap

The 2009 MBP uses a Texas Instruments fuel gauge IC that stores learned discharge curves from the previous cell in non-volatile memory. When a new cell goes in, that stored curve no longer matches the actual chemistry — so the IC predicts empty far too early. Under combined CPU and display load, the board sees a voltage dip the IC interprets as cutoff and kills power. Running one full discharge-to-hibernate then a complete uninterrupted charge forces the IC to rebuild its curve against the new cell's actual voltage profile.

macOS showing 0% or "Service Battery" immediately after fitting a new cell

This happens because the EEPROM on the old battery held cycle count and health data that macOS cached. The new cell arrives with a different EEPROM state, and macOS briefly reports an unknown or degraded battery until the SMBus syncs. Reset the System Management Controller by shutting down, holding Shift+Control+Option+Power for ten seconds, then booting. After one full calibration cycle the health status normalises and the Wh figure in System Information aligns with the 78.84Wh rated capacity of this cell.

Compatible Models

MacBook Pro 15 inch Precision Aluminum Unibody 2009 Version MacBook Pro 15.4"" 2.53GHz Core 2 Duo MC118LL/A A1286 MacBook Pro 15.4"" 2.66GHz Core 2 Duo MB985LL/A MacBookPro5.3 Mid 2009 MacBook Pro 15.4"" 2.8GHz Core 2 Duo MB986LL/A MacBook Pro 15.4"" 3.06GHz Core 2 Duo A1286 MacBookPro5.4 Mid 2009 MB985 MB985*/A MB985CH/A MB985J/A MB985TA/A MB985X/A MB985ZP/A MB986*/A MB986CH/A MB986J/A MB986TA/A MB986X/A MB986ZP/A MC118 MC118*/A MC118CH/A MC118J/A MC118TA/A MC118X/A MC118ZP/A MacBook Pro 15" MacBook Pro 15" A1286 2009 Version MacBook Pro 15" MB985*/A MacBook Pro 15" MB985CH/A MacBook Pro 15" MB985J/A MacBook Pro 15" MB985LL/A MacBook Pro 15" MB985TA/A MacBook Pro 15" MB985X/A MacBook Pro 15" MB985ZP/A MacBook Pro 15" MB986*/A MacBook Pro 15" MB986CH/A MacBook Pro 15" MB986J/A MacBook Pro 15" MB986LL/A MacBook Pro 15" MB986TA/A MacBook Pro 15" MB986X/A MacBook Pro 15" MB986ZP/A MacBook Pro 15" MC118*/A MacBook Pro 15" MC118 MacBook Pro 15" MC118CH/A MacBook Pro 15" MC118J/A McBook Pro 15" MC118LL/A MacBook Pro 15" MC118TA/A MacBook Pro 15" MC118X/A MacBook Pro 15" MC118ZP/A MacBookPro 15.4 Mid 2009

Replaces Part Numbers

A1321 661-5211 020-6380-A 661-5476

Technical Specifications

Voltage10.95V
Amp Hours7200mAh
Capacity7200mAh
Rate78.84Wh
Net Weight450g /15.87 oz
Gross Weight710g /25.04 oz
Approximate Weight710g /25.04 oz
Dimension 251.46 x 91.29 x 13.54mm

Product Highlights

  • Brand: Apple
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My 2009 MacBook Pro shuts off around 25% battery even though the new cell is fully charged — what's wrong?

The fuel gauge IC on the A1286 board still has the learned discharge curve from your old cell stored in memory, so it calls "empty" far too early under load. This isn't a fault with the new cell — it's a calibration mismatch. Run the laptop on battery until it hibernates, then charge to 100% without interruption or sleep. After one or two full cycles the IC rebuilds its curve and the early shutdowns stop.

System Information shows the wrong Wh rating — it says something lower than 78.84Wh — is this cell under-spec?

The Wh figure macOS pulls comes from EEPROM data on the battery's BMS, not from a live capacity measurement. A freshly installed cell reports its rated EEPROM value, which can differ from what the fuel gauge IC calculates until it has run calibration cycles. Reset the SMC (Shift+Control+Option+Power for ten seconds at shutdown), then complete one full discharge-to-hibernate and uninterrupted charge to 100%. The reported Wh figure will align with the 78.84Wh spec after the IC logs its first full cycle.

The new battery stopped charging at 80% and won't go higher — is the cell faulty?

On the 2009 MBP, charge stopping at 80% is almost always a firmware-controlled charge limit, not a cell fault. Apple's SMC activates this limit when it detects the battery has been at full charge or plugged in for an extended period — it's a deliberate preservation mode. Go to System Preferences → Battery (or Energy Saver) and check whether "Optimized Battery Charging" is enabled; disabling it and unplugging then replugging the MagSafe adapter restores normal charging to 100%.

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