The Bosch CRS180-B15 18V 1-1/8 In. D-Handle Reciprocating Saw Kit comes with a powerful, compact saw and a CORE18V 4 Ah battery. The saw is only 17.7 In. long and 6.35 Lbs. (tool only, not including battery), and it delivers an efficient 1-1/8 In. stroke, to remove more material per stroke. The saw’s Lockjaw system allows for toolless one-handed blade changes. It has two speed ranges to match the speed of the cut to the material. The Bosch CORE18V Advanced Battery is the next-gen Lithium-ion battery that keeps the power and runtime, while losing the weight. The GBA18V40 single-layer battery is engineered with the 21700 cell, the latest in battery-cell technology, the battery matches the power of the original two-layer 4.0 Ah battery with half the number of cells. This new-generation CORE18V still features the Bosch-exclusive CoolPack 2.0 heat-management system and cutting-edge engineering.