Amazon.com : DM18RL Battery Adapter for Milwaukee for Dewalt 20V/18V Lithium Battery Convert to for Ryobi 18V ABP1801 P108 Battery : Tools & Home Improvement
FirstPower Battery Adapter for Makita 18V Lithium-ion Power Tools,Convert Milwaukee 18V or Dewalt 20V Lithium-ion Battery to Makita 18V Lithium-ion Battery - - Amazon.com
Mellif USB Battery Adapter DM18RL for Dewalt to Ryobi Battery, for Dewalt 20V for Milwaukee 18V Convert to for Ryobi 18V Lithium-ion Battery - - Amazon.com