Replacement Laptop Battery for PANASONIC 6140-01-540-6513 CF-VZSU29 CF-VZSU29AU CF-VZSU29U Series, Product Type: Laptop Battery, Notebook Battery, Battery Type: Lithium-Ion (Li-Ion), Voltage: 10.8V, Capacity: 6600mAh, Number of Cells: 9, Color: Black, Warranty: 60-Day Money Back Guarantee. Full One Year Warranty. Compatible Laptop Models: CF-VZSU29, CF-VZSU29AU, OEM Part Numbers: Panasonic CF-29, Panasonic CF-52, Panasonic ToughBook 52, Panasonic ToughBook CF-29, Panasonic ToughBook CF-52