Puredick&reg; New Laptop Battery for Apple MacBook Air 13" A1405 (2012 Version) A1496 A1466(2013 Version) MC503 MC504 A1377 A1369 (Late 2010 Mid 2011 Mid 2012 Mid 2013 Early 2014), 020-7379-A 020-8143-A 020-8145-A 020-8145-01 020-6955-A 020-6955-01 661-6055 661-5731 MD760LL/A + Two Free Screwdrivers- 18 Months Warranty [ Li-Polymer 4-Cell 7.3V 50Wh] Battery type: Li-Polymer; Capacity: 50Wh; Cells: 4-Cell; Voltage: 7.3V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. CE-/FCC-/RoHS certificated for safety,18 months warranty,professional technical support, efficient and always satisfied customer service 24 x 7 email support. Operation time:Same Battery life with Brand new original Apple battery.In reality, this will depend on the amount of electricity required by the device and how you use it