SpecificationsBattery Voltage: 10.8V.
Capacity: 56Wh.
Cells: 4-Cells.
Battery life: Up to 500 recharge cycles over the life of the battery. ^^ Compatible Part NumberA1280 MB771G/A MB467LL/A MB466LL/A. ^^ Compatible the Modelsfor MacBook 13" A1278 Battery, MacBook 13" MB466*/A Battery, MB466CH/A Battery, MB466J/A Battery, MB466LL/A Battery, MB466X/A Battery, MB467*/A Battery, MB467CH/A Battery, MB467J/A Battery, MB467LL/A Battery, MB467X/A Battery. ^^ Quality Assurance100% new from manufacturer, every battery has passed factory testing, grade A cells ensure fast charges and low power consumption, built-in circuit protection ensures both safety and stability, guarantee your piece of mind while using the battery or storing it. ^^ Perfect Customer Service24 x 7 email support. Your satisfaction is extremely important to us. If you have any doubts, please click on seller store on right corner ask a question and contact us directly, professional and friendly customer service will be provied for you.