A:Answer Hello! Thank you for your inquiry. Battery life varies considerably depending on the model of device you have and your usage. 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. Model #LIJVF823 has a mAh rating of 2400. Even though this does not 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! Thank you.