Replacement Battery Model: A1527/A1705; Full Charge Capacity: 37 Wh 4900 mAh; Voltage: 7.56 V; Compatible with models: MacBook 12-inch A1534 (Early 2015, Early 2016, 2017) 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