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For occasional around-the-house chores, a lightweight 9.6V model is a cost-effective choice. It will drive about 50 screws between charges. For light remodeling projects, a 12.0V model will drive about 150 screws. For heavy duty jobs such as drilling in metal or major remodeling, consider a 14.0V drill. An 18.0V model is usually only needed by professionals requiring high torque.