So, it's time to investigate. According to DeWalt, "XR" stands for eXtreme Runtime or extended runtime. They say that the batteries have higher capacity than non-XR batteries and that the tools ...
The good news is that you can absolutely use a Flexvolt pack on an XR tool; in fact, they're built with that exact use case in mind. The big gimmick behind DeWalt's Flexvolt battery packs is that ...