A1965 Battery Capacity: 4800mAh, Voltage: 11.4V/55Wh, Battery Type: Li-Polymer Premium Electric CoreJapan Newest 4.0 upgraded battery for macbook air 13 A1932. Better circuit board, multiple command chip control, keep the battery stable charge and discharge.Over charger and discharger (short-circuit) protection, ensure fast charges and low power consumption