Brand new 9 cells (73Wh,10.95V) replacement battery for Apple A1321 laptop is made with high-grade Li-ion cells from Panasonic, LG or Samsung to ensure maximum performance, high quality and long lifetime,cells are the heart of the battery. All our Li-ion replacement batteries for Apple A1321 laptop have been tested and proven to match and/or exceed original battery performance and are 100% compatible with Original Manufacturer Specifications