Lazada Laptop Replacement Battery for Apple A1245 A1237 A1304, Apple MacBook Air 13" MB003 MC233 MC234 MC503 MC504, 661-4587 661-4915 661-519 [Li-Polymer 7.2V 37Wh] 100% new from manufacturer, up to 500 recharge cycles over the life of the battery. Battery type:Li-polymer;Cells:6;Capacity:37Wh;Voltage:7.2V. Safe guarantee:CE-/FCC-/RoHS-Certified for safety. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time: Over 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.