The stiga e420 is a 2ah 48v battery for use with the stiga 48v 500 series mowers and garden tools and the 700 and 900 series garden tool only excluding mowers'. '.strtoupper('t')he batteries are 2 x lithium ion batteries that work simultaneously together. dual 48v lithium batteries are more efficient as they work together maximises power output'. '.strtoupper('t')he next generation 500 series batteries also offer longer run times and product life due to the twin design'. '.strtoupper('n')ew version of sbt 520 ae'. '.strtoupper('s')tiga have superseded to 274012004 st1