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Hilti claims that its TE 2-A18 Rotary Hammer Drill delivers the same power as its TE 2 corded model. The tool has a high-efficiency motor, a drop-resistant housing, an LED work light, and a lithium-ion battery, and is comparable in weight to the corded version. Optimum drilling diameter range is 3/16 inch to 3/8 inch. A compact model is also available. Professionals who buy either drill get unlimited battery replacements for two years. The TE 2-A18 costs about $500.