Fits for MacBook air 13 inch a1466 battery: Battery ModelA1496 /A1405 /A1377. Parameter--Capacity: 7200mAh/55Wh, Voltage: 7.4V. Battery Type: Li-Polymer Battery Advantages: 1.More than 1500+ recharge cycles over the life of the battery; 2.100% Safe with Upgrade chip to ensure 6-fold protection, eg.Intelligent temperature control-Over heat protection, Over charging protection, Short circuit protection...Without (swollen battery) Damage to laptop, 3. High Performance Electric Core, Real capacity can ensure the long operating time after charging full