This is a brand new Dell Precision M6400 and M6500 long run 9 cell battery. This battery replaces the battery in Dell Precision M6400 and M6500 models and the part numbers listed below.

This is a battery for a high performance Precision 4600 engineering workstation. Consequently, the power consumption of your laptop is higher than most. As a result, you can expect about 2-3 hours of run time with this computer battery when new, depending on your energy use.