This Panasonic ToughBook brand laptop battery CF-VZSU1431U provides a secondary battery by inserting it in place of your CD player. This media Bay Battery is for the ToughBook 31 MK1 i3 units. Also fits the CF-52 P8400 i3 MK2 and MK3.
Not Compatible with i5-Discrete models or CF-31 models with i5 2.53 Ghz or i5 2.60 Ghz processors. NOTE: The secondary battery does not fit all CF-31 or CF-52 Models.