Amazon.com: Adapter Converter for Makita 18V BL1860 BL1850 BL1840 Li-ion Battery to Ridgid AEG 18V Hyper li-ion Power Tool Battery : Tools & Home Improvement
Battery Adapter Compatible with Makita 18 Volt NiCad & NiMh Cordless Power Tools, Converter for Convert Makita BL1830 BL1850 BL1860 BL1840 18V Lithium-Ion Battery to Makita 18V Ni-Cd/Ni-Mh Battery