Go to Amazon Sites : br br HP Pavilion dv7-3173nr Laptop Battery - New TechFuel Professional 6-cell Li-ion Battery br br Battery Type 6-cell Li-ion Voltage 144V CapacityEnergy Storage 4400mAh63Wh br Brand new battery constructed with advanced circuit board technology including built-in thermal circuit protection for safety and stability Grade-A cells for faster charging and more efficient power consumption br Precision construction for optimal fit CE and RoHS certification ensures quality safety and peace-of-mind Up to 500 charge cycles over the life of the battery br Friendly and knowledgeable Customer Support Staff available by email or toll-free telephone No risk 30-day money back guarantee 1-year full replacement warranty br Built with quality components and rigorous quality control Operating time will vary depending upon computer settings hardware use etc Generally for every 2000mAh the battery will yield approximately 1 hour of run time