Battery Pack for MDWD Toughbook 08 and Toughbook 07, Genuine Panasonic Replacement Battery Pack for the Toughbooks 08 (MDWD) and Toughbook 07

The CF-VZSU21W is the exact same battery that came in the Toughbook 07 and Toughbook 08 (also called MDWD), the battery in your Toughbook may read as CF-VZSU21 without the U but the CF-VZSU21U is the replacement for that Battery with a slight alteration to the model number when it began to support a new model.