SLODA New Laptop Battery for Apple A1237 A1245 A1304 MacBook Air 13" (only for Early 2008 Late 2008 Mid 2009), also fit 661-4587 MB003 MC233 MC234 with One Free Screwdriver [Li-Polymer 4-cell 37Wh] Battery type: Li-Polymer; Capacity: 5000mAh/37Wh; Cells: 4-cell; Voltage: 7.2V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 8-hr x 5-weekday call support, 12-month hassle-free warranty. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time for standard batteries: Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.