Brand New POWWER 9 Cell 7200mAh 85whr Ultra Hi Capacity Replacement Li-Ion re-chargeable battery for Dell Latitude D830 laptop computers. Always on the go? No more worries about running out of battery power! You can back up your system with this 9-Cell 85whr Ultra Hi Capacity Dell Latitude D830 Notebook Lithium-Ion Battery from POWWER. 1 Year Warranty: We will replace this or any other item that you purchase from us for 1 year from the date your order is processed if it fails under normal wear or is defective. We always sell new high quality items and we are willing to back them up! The POWWER / SterlingTek name images and contents of this SterlingTek listing are protected by trademarks and copyrights. Copyright © 2009 SterlingTek. Quality Products @ Great Prices .... Guaranteed. SterlingTek!!! Serving You Since 1999. How long can this battery last? ***Please compare with your battery's capacity: for example 4800mah may have double running time than 2400mah (actual running time may different depends on the program using on your computer). The higher the mAh rating the longer the battery will hold its charge between charging cycles.