Replace your old, dead Toshiba battery for PA3634U-1BRS. This replacement battery is compatible with the Toshiba U400, U405, U405D, U500, and U505 series laptops. Charges quickly. Longer discharge time. Steady output and low power consumption. More than 500 times charge-discharge cycles over the battery lifetime. Best for Business trip and game playing. Using Li-ion cell to make your battery have a LONG life span.Made by 6 high quality Li-ion cells with no memory effect. Compatible with your equipments and chargers perfectly. Built-in circuit protection,Automatic power cut off at high electric current,voltage or temperature ensures safety and extended battery life.Meets and exceeds OEM specifications. Actual operation time varies depending on types of the device and the way it is used.