Dewalt to Makita 10.8V Battery adapter by cornellius - Thingiverse
Amazon.com: Battery Adapter for Makita DCA1820 18V Compatible with Makita Lithium Battery to DeWalt CA1820 18V DC9180 DC9096 Tool Use : Tools & Home Improvement
ZDTZAN MT20DL Battery Adapter for Makita 18V Li-ion Battery use on Dewalt 20V Battery Tool, Convert for Dewalt 18V 20V DCB200 Li-ion Battery Cordless Power Tools
Adapter For DEWALT Convert MAKITA 18v Li-Ion Battery To DEWALT 18v Battery Use Bl1850 DEWALT Tools MT20DL - Walmart.com