Powerku Laptop Battery for Apple Macbook Pro Retina 13" A1437 A1425 020-7652-a Md212ch/a Md212 Md213 Md212ll/a Md213ch/a 11.2v 74wh 18 Months Warranty A-Grade Li-polymer cell at full capacity health All batteries are tested in the computer and left in there to confirm they will hold a charge over time MSDS/ROHS/UN38.3 Certified and all batteries have been drop tested 24 x 7 email support, weekday phone support during normal business hours Powerku has 10 years of industry experience and offer exception service to our customers.