45-watt-hour lithium polymer Capacity 55 Wh Product DescriptionFor travel or backup, choose an extra rechargeable battery for your black, 13-inch MacBook. This 55-watt rechargeable lithium polymer battery is compatible only with the black, 13-inch MacBook…. More >> $92.99 Apple MB771LL/A 13-inch Macbook Rechargeable Battery Click Image To View Details