CMOS BATTERY Toshiba Satellite A20 GDM710000003 Real Time Clock Bios Backup Battery is a Rechargeable Sony US1620 backup battery that is trickle charged by the Toshiba Motherboard. The battery will have a 2 pin Molex connector on the end to allow it to be fastened to the Motherboard mating connector. Genuine Toshiba P/N P000331520 will consist of a rechargeable Lithium ion Sony 16mm diameter 2mm thickness model US1620. Printed Markings GDM710000003 3v Lithium Ion This is traditionally called a cmos battery it can also be identified as the memory battery, as a Real Time clock Bios Battery, diskcell, pile, pila, akku batterie and other names that the industry refers to it. Sony US1620 Li-Ion Battery 2 wires 2 pin connector plug