A:Answer Hello! Thank you for your inquiry. Replacement battery model #LBD435 is a 9 cell battery. Regarding the run time that varies considerably depending on the model of device you have. The best way to compare a new battery is to compare it to your old battery by the mAh or Wh, which indicate how powerful the capacity of a battery is. Even though this doesn’t give you a run time at least you know if you are getting a battery that is comparable. If you have any further questions, please let us know!