What is the difference between the 661-5229 and the 661-5557 batteries for the Apple MacBook Pro "Core 2 Duo" 2.4 13" Mid-2010 A1278 EMC 2351?

Apple 60W MagSafe 2 Power Adapter
(MacBook Pro with 13-inch Retina display)

Apple 60W MagSafe 2 Power Adapter (MacBook Pro with 13-inch Retina display)

Product No Longer Available

1 Answer from the Community

  • 661-5557 is a 63.5 watt-hour battery and 661-5229 is a 58 watt-hour battery. Just means that the 661-5557 will last a little longer than a 661-5229 would in the same system. Basically, go for the 661-5557 if you can. More battery life is always a good thing.