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Rectangular silver laptop battery with black connector end

myVolts

myVolts MB990J/A laptop battery 66.6Wh 11.1V 6-cell

SKU CH-4WSR-6GGAR MPN MB990J/A

Lithium-polymer replacement battery delivering 66.6 Wh at 11.1 V for 13-inch MacBook Pro models from 2009 to 2012

  • 6Wh capacity powers MacBook Pro 13-inch through long sessions
  • 1V 6-cell Li-Polymer chemistry delivers stable voltage for daily work
  • Replaces Apple part numbers 661-5229 and 661-5557 for exact fit
  • Compatible with Mid 2009 to Mid 2012 models including A1278 and A1322
  • Built-in circuit protection guards against overcharge and deep discharge

Replacement battery for MacBook Pro 13-inch

This 66.6Wh lithium-polymer pack replaces Apple part numbers 661-5229 and 661-5557 across MacBook Pro 13-inch models from Mid 2009 through Mid 2012. It fits machines identified as A1278 and A1322 including MB990, MB991, MC374, MC375, MC700, MC724, MD313 and MD314 series. The six-cell design delivers 11.1V for direct compatibility with the original power system.

Certified safety circuits with 500-cycle rating

UL, CE, RoHS and FCC certifications cover the integrated overcharge and over-discharge protection circuits built into the pack. The manufacturer rates the cells for up to 500 recharge cycles over the service life. No active cooling or fan is required; the battery operates within the thermal envelope designed for the host notebook.

Drop-in install with no extra software

The battery ships as a single unit ready for user installation using the standard enclosure screws on supported models. No drivers, firmware updates or calibration utilities are bundled or required. Buyers needing a higher capacity than 66.6Wh or compatibility with Retina or later MacBook Pro models cannot use this pack.

Highlights

  • 6Wh capacity powers MacBook Pro 13-inch through long sessions
  • 1V 6-cell Li-Polymer chemistry delivers stable voltage for daily work
  • Replaces Apple part numbers 661-5229 and 661-5557 for exact fit
  • Compatible with Mid 2009 to Mid 2012 models including A1278 and A1322
  • Built-in circuit protection guards against overcharge and deep discharge

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the MB990J/A battery in my Mid 2012 MacBook Pro 13 inch, and what step do people often miss?

Remove the ten bottom-case screws, disconnect the old battery connector from the logic board, fit the new 6-cell 11.1 V pack, reconnect the connector firmly, then replace the screws; the step often missed is reseating the connector until it clicks.

What maintenance or replacement will the 66.6 Wh Li-Polymer pack need later?

The pack is rated for up to 500 recharge cycles; after that capacity drops noticeably and a replacement battery will be required.

What limit appears first during sustained use of this 11.1 V 6-cell battery?

The built-in overcharge and over-discharge protection circuit will cut power if voltage exceeds safe thresholds, which is the first limit reached under heavy continuous load.

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