You might not use a power cutter often, but it's very handy to have your own once the need arises. This product has a voltage of 18V.
From Data Powertools
Makita DCC500Z 18V 125mm LXT Brushless Disc Cutter Body Only
ITS
Makita DCC500Z 18V LXT Brushless Dustless 125mm Disc Cutter - Body