Batterytec&reg; Battery for HP ProBook 640 645 650 655, ProBook 640 G0, 640 G1, 645 G0, 650 G0, 650 G1, 655 G1; CA06 CA06XL CA09, HSTNN-DB4Y HSTNN-LB4Y HSTNN-LB4Z. [10.8V 4400mAh, 12 Months Warranty] Battery Type: Li-ion, Cells: 6-cell,Capacity: 4400mAh; Voltage: 10.8V. 100% New Manufacturer. To 500 charging cycles during the lifetime of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 12 months Warranty without problems. Class A cells provide fast loads and low power consumption, chip protection offers both security and stability.