This impact driver is a perfect companion when you take on your building project. It runs on a rechargeable battery, so it's completely cordless.
From Amazon
Makita DTD154RTJ 18V Li-Ion LXT Brushless Impact Driver Complete with 2 x 5.0 Ah Li-Ion Batteries and Charger Supplied in A Makpac Case
Powertool World
Makita DTD154RTJ LXT 18v Li-Ion Brushless Impact Driver Inc 2x 5.0Ah Batts