BE&middot;SELL Replacement Laptop battery for MacBook Unibody 13" A1331 A1342 661-5391 020-6580-A 020-6582-A MacBook Air 13.3" MC233LL/A MC234LL/A Voltage:10.8V; Capacity:63.5wh CE-/FCC-/RoHS-Certified for safety Grade A cells ensure fast charges and low power consumption, Built-in circuit protection ensures both safety and stability 18 Months Warranty