【A1618 Replacement Battery Capacity】8800mAh/ 99Wh 11.26V, Battery Type: Li-Polymer【Compatibility】 Compatible part numbers:661-00123， A1398(EMC 2674)，A1398(EMC 2745),A1398(EMC 2876)，A1398(EMC 2881)，A1494【Premium Electric Core】Our Laptop batteries are assembled from top quality material and circuit boards to ensure durability and performance, our batteries are equipped with grade A battery cells that provide up to 1000 charging cycles.【Premium Quality Replacement Notebook Battery】UL-/CE-/FCC-/RoHS-Certified/PSE Report for safety.【Warranty】 Provide 60 days Refund Service and 12 months Warranty, Please Note: The return windows of Amazon would be expired after one month. You can contact with us directly by the way as follow: Click our brand "BND" (under the button of "Buy Now")-----Click "Ask a question" and send us your message. We would reply you in 12 hours.