Amazon.com: Battery Adapter for Makita 18V Lithium-Ion Cordless Tools, Convert for Milwaukee M18 18V or Dewalt 18V 20V Lithium Battery to Makita 18-volt BL1830 BL1850 LXT Battery Converter, w/ USB Charge Port :
Amazon.com: 2Packs Upgraded 5.0Ah 18V BL1850B with LED Replacement Lithium-ion Battery Compatible with Makita 18 Volt Battery for Compatible Makita 18V Lithium-Ion Cordless Power Tools : Tools & Home Improvement
Amazon.com: 18V BATTERY 5.0AH : Health & Household