Circular saws have one blade mounted right on the axle of the engine. It has a voltage of 18 volts and weighs in at 3.2 kg, so it should work for everyday use.
From Data Powertools
DeWALT DCS391N 18v XR Circular Saw Bare Unit
This product is also available at 4 unverified merchants.
Too expensive? Get a notification as soon as the price drops.