Circular saws have one blade mounted right on the axle of the engine. The voltage amounts to 18 volts and has a somewhat modest weight of 4.7 kg.
From ManoMano
MT5518MBL 18V cordless plunge saw - Mafell
ITS
Mafell MT5518MBL 18V 57mm Plunge Saw with 2 x 5.5Ah Batteries, Charger & Case