Amazon.com: MT20DL Battery Adapter for Makita 18V BL1830 BL1860 BL1815 Li-ion Battery Convert for Dewalt 18V 20V DCB200 Li-ion Battery
Amazon.com: Amityke Battery Adapter,Power Wheels Adapter for Makita 18V/14.4V Battery BL1820, BL1830, BL1840, BL1850 with 14 awg Wires Power Convertor for DIY Ride On Truck, Robotics, RC Toys and Work Lights :
Amazon.com: 2 Pack 6.0Ah BL1860B Battery with DC18RC Charger Compatible with Makita 18V Battery BL1860 BL1850 BL1850B BL1840 BL1840B BL1830 BL1830B BL1815B LXT400 18-Volt Power Tools Batteries : Tools & Home Improvement