Amazon.com: powerost A1331 Laptop Battery Repalcement for Apple MacBook 13" A1342 MC233LL A MC234LL A MC375LL A MC516LL A MC207LL A 661-5391 020-6580-A 020-6582-A 10.95V/63.5wh Notebook Battery : Electronics
MacBook 13" A1342 Battery for Model A1331 (2009-2010)
MacBook Air (13-inch, Mid 2011) - Technical Specifications - Apple Support