chuter

I have a Milwaukee Heavy Duty 3/8" Cordless Hammer Drill Model 0420-1, . It's a fantastic drill/driver. The only down side is the horrible battery life. I have two of the Supertough 2 2.0 Amp hour batteries 48-11-0250 that give me only minutes of battery life. If I get four-six screws into wood or a few holes drilled in metal or wood from each battery I'm lucky. Are there other options for batteries for this unit?