DEWALT DW9057 Compact 7.2-Volt 1.7 Amp Hour NiCd Pod Style Battery 10% Lighter than stnadard batteries 15% Smaller than standard batteries Powers the DEWALT line of 7.2-volt tools allowing users to run multiple tools off of the same battery pack Weighs 0.8 pounds Weighs .8-pound; 3-year limited warranty