Makita battery adaptor to fit Ryobi - nailer,driver, drill, grinder, saw, wrench | eBay
Amazon.com: ZDTZAN Battery Adapter MT20RNL for Makita 18V Battery to Ryobi 18V Battery, Convert for Makita 18V Battery to Ryobi 18V Lithium-ion Battery Tool Use : Tools & Home Improvement
Makita Battery Adapter to Ryobi – Power Tools Adapters