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Battery Benefits: Over 1000+ recharge cycles; Certified by CE, FCC, RoHS and UL for safety. Features an improved circuit board with multiple command chip control for stable charging and discharging. Overcharge and over-discharge protection provides fast charging and low power consumption. Compatible Laptop Models: Fits MacBook Air Retina 13-inch Model A1932 EMC 3184 (Late 2018, Late 2019), and Model A2179 EMC 3302 (Early 2020). Model Identifier: MacBookAir8,1, MacBookAir8,2, and MacBookAir9,1. Specification: Battery Model A1965. Capacity: 4379mAh/49.9Wh, Voltage: 11.4V. Battery Type: Li-Polymer; 100% brand new. Compatible Part Number: Replaces MacBook Air Retina 13-inch Model A1932 and A2179 from 2018-2020, battery type A1965. Model Numbers: MRE82LL/A, MRE92LL/A, MREA2LL/A, MREC2LL/A, MREE2LL/A, MREF2LL/A, MUQT2LL/A, MUQU2LL/A, etc. High Performance Upgrade: The upgraded high-performance battery supplies reliable power with 11.4V, 49.9Wh, 4379mAh capacity, ensuring extended usage time for your MacBook Air 13-inch laptop