Please note this battery is only suitable for Macbook Pros built in early 2011 Please check your own battery first, if your battery model is A1321, It is not compatible. DAMAITE is a professional manufacturer with 15 years of experience, whose mission is to develop, manufacture and sell high quality and stable rechargeable lithium-ion batteries and related products. We regard quality as an important factor for our survival in the market. All our products have passed CE, FCC, RoHS certification. Batteries and chargers have perfect protection functions such as overcharge, overdischarge, overcurrent, and overtemperature, making them safe, stable and powerful. We believe that quality products can give our customers more confidence to sell our products in the world market. Our goal is customer satisfaction.