Reciprocating saws are practical since they can cut both flat and vertical surfaces. It has a voltage of 18 volts and has a somewhat modest weight of 1.7 kg.
From Amazon
BLACK+DECKER 18 V Cordless 20mm Reciprocating Electric Saw, Battery not included, BDCR18N-XJ
Robert Dyas
Stanley Black+decker® 18V Cordless Reciprocating Saw (bare)