CSE New Laptop Battery for HP EliteBook 2530P 2540P HP COMPAQ Business Notebook 2400 2510P NC2400 for Part #'s RW556AA 411126-001 412779-001 HSTNN-DB21 HSTNN-FB22 Laptop Notebook -12 Months Warranty Battery type: Li-ion; Capacity: 5200mAh/58WH; Cells: 6-cell; Voltage: 11.1V. 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,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: the actual operation time will depend on how much electricity is required by the device and how you use it.