This HSTNN-FB40 battery replaces the HP Business notebook 510 and 530 series models. This battery is rated 14.4 volts and 4400 mAh and will normally last 2.5 hours.

Replaces these HP battery part numbers:

440264-ABC
440265-ABC
440266-ABC
440267-ABC
440268-ABC
440704-001
441674-001
443063-001
4438518-001
446783-001
HSTNN-C20C
HSTNN-C29C
HSTNN-FB40
HSTNN-IB44
HSTNN-IB45
RW557AA