And the specs on this little gem are:

Cordless electric impact screwdriver HITACHI KOKI 18V Cordless Impact Driver
(3.0Ah Li-ion Battery)
- Compact, lightweight 1.6kg(3.5 lbs.) and short body 162mm (6-3/8")
- Powerful design, class-top tightening speed and tighteing torque 150N-m (1,330 in-lbs.)
- Powerful large cooling fan for high-motor durability- The UC18YRL is capable of recharging Li-ion, Ni-Cd and Ni-MH batteries from 7.2V to 18V