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 OnBuy
Black & Decker BDCR18N-XJ Reciprocating Saw 18 Volt Bare Unit
Robert Dyas
Stanley Black+decker® 18V Cordless Reciprocating Saw (bare)