Coolgo New Laptop Battery for HP COMPAQ MU06 MU09 593554-001 593562-001 HSTNN-UB0W HSTNN-UB1G MU09XL - 18 Months Warranty [li-ion 9-cell 9cell 10.8V 7800mAh Black] 9cell 10.8V 7800mAh Black for HP Pavilion DM4 Compaq Presario CQ32 CQ42 CQ62 G62 MU06 MU09 10.8V 5200mAh Black Quality Certication: All the products pass the ISO9001, CE and ROHS, FCC multiple international authentication and completely accord with environmental protection requirement. Consummate Design: Excellent design makes the product not only has the overcharge, discharge and short circuit multiple protection, but also to balance charge-discharge of all the internal cells. Environmental Test: Standard modern assembly line. All products have passed a variety of charge-discharge and aging test before they leave the factory. 100% quality test for all items. Operation time: For standard battery(6-cell, 4400mah): 2-3 hours; for extended battery(12-cell, 8800mah): over 4 hours (Note: The actual operation time depends on how much electricity is required by the device and how you use the battery.)