You can expect about 2 hours to 4 hours of additional run time with this Fujitsu FPCBP446AP battery when new, depending on your energy use.
This laptop also has the ability to add a CD Modular Bay Battery. Simply pull out the CD Player & insert a second battery in it's place. The modular battery is found by following this link: (
Modular Bay Battery)
This battery works as an additional battery in these Fujitsu LifeBook models: