2 x 4.0Ah batteries, not a bad deal (even if brushed motors)
The Stanley FatMax V20 18V Combo Kit includes an 18V Hammer Drill, 18V Impact Drill Driver, 18V Circular Saw, 18V Angle Grinder, two 18V V20 Cordless System 4.0Ah batteries, a 2.0A charger and a soft storage bag.
fatmax is still a brand?? I bought a drill years ago, back in Masters closing down sale days. Thought the fatmax brand line disappeared as I hadn't seen them anywhere (other than tape measures). On a side note the drills and battery are still great (but I rarely use it).