Circular saws have one blade mounted right on the axle of the engine. The voltage amounts to 18 volts and weighs in at 2.8 kg, so it should work for everyday use.
From Amazon
Makita DCS553Z Cordless Metal Circular Saw 18 V (Without Battery, Without Charger), Blue
Buyaparcel
Makita DCS553Z 18V LXT 150mm Brushless Metal Cutting Circular Saw - Bare Tool