The Bosch 36V ½” Hammer Drill is every bit as powerful as any corded model you are likely to have in your arsenal but with the obvious advantage of being cordless. Typically the Bosch 18636-02 kit which includes 2 FatPack batteries sells from around $400. Currently there is a very limited supply available from Ohio Power Tool for $199. These batteries alone are worth $150 each and supply seemingly endless power, in most cases 2 fully charged batteries will get you through almost any day.