Universal Lightweight Lithium Polymer Rechargeable Battery; Doubles The Life Of A Laptop Battery; Provides Up To 7 Hours Of Extra Power When Maximized With The Extended Battery; Automatically Detects Voltage Of Connected Laptop; Modular Design Allows The Addition Of A Second Battery To Double The Life Of A Battery Laptop Between Charges; Provides An Additional Usb Port, Enabling Simultaneous Charging Of Other Small Portable Devices Like Cellular Phones & Ipods; Includes 9 Adapter Tips, Including A Mini Usb Tip For Connection To Most Small Portable Devices