Long Life Battery for Toughbook 29, Toughbook 51, Toughbook 52 MK1, Toughbook 52 MK2 and Toughbook 52 MK3.  Genuine Panasonic Toughbook Replacement Battery

The CF-VZSU29ASU is the replacement Toughbook battery for the compatible laptops listed above.  With the Toughbook 52, the CF-VZSU29ASU is the same battery that came with the High End version of the laptop (a 9 Cell Battery), the low end version of the Toughbook 52 comes with a 6 Cell and this battery can be used as an extended life battery for the low end 52 as well.

The CF-VZSU29ASU replaces the Toughbook battery models:
CF-VZSU29
CF-VZSU29AU
CF-VZSU29A