Amazon.com: Battery Adapter Converter for Makita BL1850 BL1860 18V Battery to Hitachi 18V BSL1830C BSL1815X BSL1815S BSL1830 Battery, to Metabo HPT 18V Battery, Work with Hitachi & Metabo 18V Slide Style Tools :
2Pack 5.0Ah Lithium-ion BL1850B Replacement for Makita 18V Battery Compatible with Makita 18 Volt Battery LXT BL1815 BL1830 BL1830B BL1835 BL1840 BL1850 BL1860 BL1860B - - Amazon.com
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