After I bought my DeWalt 24-volt 6-1/2" circular saw I decided I also needed a AC power source. So I bought the DeWalt DW0247 24 Volt AC/DC Converter. I didn't make a wrong choice with this. The converter supplies the same power as the 24-volt battery but keeps on going. It has a built in fan to keep it cool. I liked how it was the same size as the battery but weighed a lot less. So if you have the saw you have to have the converter.