TechFuel PA3817U-1BRS PA3818U-1BRS Laptop Battery for Toshiba Satellite Laptops - Professional Performance (6-cell, 4400mAh 48Wh) Battery Type: 6-cell Li-ion; Voltage: 10.8V; Capacity/Energy Storage: 4400mAh/48Wh 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 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 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 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 Lithium-ion batteries must be shipped with less than 30% charge. Always fully charge your battery when it arrives. Laptop batteries need to be used. Unless you are charging your battery, do not leave your laptop plugged into the wall when not in use, or for extended periods while in use. Leaving the laptop plugged in with the battery installed will shorten the life of the battery. Never allow your battery to become fully depleted. Doing so may trip the battery&#039;s power protection circuit, preventing your battery from recharging.