DESC: Lithium-ion provides up to 50% longer run-time than 18-volt NiCd batteries. Superior cold weather operation allows near full run-time performance down to -4 degress Farenheit 14.4-volt NiCd battery weight with 18-volt power V-technology batteries provide fade-free power until the end of discharge 5-year/2000-charge warranty; compatible with all Milwaukee 18- to 28-volt batteries, Weight: 2 lbs., Manufacturer: Milwaukee