Replacement Battery Model: A2389; Full Charge Capacity: 55 Wh 4800 mAh; Voltage: 11.4 V; Compatible with models: MacBook Air 13-inch A2337 (2020 M1) Advanced Quality: All-new 5.0 technology upgrade; High-capacity Japanese battery cells for longer-lasting and safer performance Superior Safety: BattArmor safety system with overcharge, circuit-overload, short-circuit, temperature protection and more Quality Certification: The battery is quality-certified and tested to provide the reliable power for your MacBook What You Get: Battery; Installation tools and guide; Service Manual; 24-hour friendly customer service