Puredick Li-Ion 8-cell 14.8V 3900mAh/58Wh Laptop Battery for Dell XPS 14Z / 14Z-l412X / 14Z-l412Z Battery Type: Li-ion || Voltage: 14.8V || Capacity: 3900mAh/58Wh|| Color: Black||Cells: 8-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