Dell Original 65 WHR 6 Cell Battery for Precision Mobile M4600 M4700 M6600 M6700 WorkStations Always on the go- No more worries about running out of battery power! You can power your Laptop with this 6-Cell Lithium-Ion Primary Battery from DellTM. With a capacity of up to 65 WHr, the battery lets you work seamlessly when you are on the move for business trips or vacations. This battery provides uninterrupted reliable performance you need to get the most out of your system.