Puredick Replacement Laptop Battery for Apple Macbook Pro 13 inch A1278 A1322 [2009 2010 2011 Version] Battery 020-6547-A 661-5229 661-5557 (XT3) Battery Type: Li-ion || Voltage: 11.1V || Capacity: 44Wh || Cells: 6-cell 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,12 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 Dell battery.In reality, this will depend on the amount of electricity required by the device and how you use it.