This new Li-Polymer laptop replacement battery from V7 is 100% compatible with your MacBook 15 inch Aluminum, MB722 laptop and is rated at 10.8V, 4200mAh. V7 laptop batteries all come with a 1 year warranty and meet or exceed the original Apple laptop battery specifications because they are manufactured for high performance in ISO 9000 factories using the best quality cells and most up to date safety and engineering control standards.