Capacity: 8440mAh/95.03Wh 11.26V, Battery Type: Li-Polymer 【Package include: 1pcs - OEM laptop replacement battery for macbook air 13 inch, 2pcs - screwdrivers, 1pcs - Professional installation instructions】【Operating life and certification】UL-/CE-/FCC-/RoHS-Certified/PSE Report for safety. Cobalt Proportion: >98%. Upgrade chip -- Up to 1500+ recharge cycles over the life of the battery, Long operating time after charging full with 8440mAh