SpecificationsBattery Voltage: 11.4V. Capacity: 51Wh. Cell: 3-Cell. Battery life: Up to 500 recharge cycles over the life of the battery. Compatible Part Number CI03, CI03XL, C103XL, CIO3XL, CI03048XL, CIO3, HSTNN-UB6Q, HSTNN-LB6T, HSTNN-PB6K, HSTNN-UB6Q, HSTNN-DB7N, HSTNN-I66C-4, HSTNN-I66C-5U, HSTNN-I66C-5H, HSTNN-I67C-4, HSTNN-I67C-5, 801517-221, 801517-222, 801517-231, 801517-232, 801517-241, 801517-242, 801517-421, 801517-422,801517-541, 801517-831, 801554-001. Compatible ModelsReplacement for ProBook 640 G2, ProBook 640 G3, ProBook 645 G2, ProBook 645 G3, ProBook 650 G2, ProBook 650 G3, ProBook 655 G2, ProBook 655 G3 Notebook. Quality Assurance100% new from manufacturer, every battery has passed factory testing, grade A cells ensure fast charges and low power consumption, built-in circuit protection ensures both safety and stability, guarantee your piece of mind while using the battery or storing it. Perfect Customer Service24 x 7 email support. Your satisfactio