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FirstPower Battery Adapter for Makita 18V Lithium-ion Power Tools,Convert Milwauk 18V or Dewalt 20V Lithium-ion Battery to Makita 18V Lithium-ion Battery - Amazon.com
Amazon.com: V7 Battery Adapter for Makita 18V Lithium Battery Converter to Replace for Dyson V7 Battery, Work for Dyson V7 Series Vacuum Cleaners Animal Absolute Fluffy HEPA Cordless Stick(V7 Adapter Not Battery) :
Makita BL1850B2DC2 18V LXT® Lithium-Ion Battery and Dual Port Charger Starter Pack (5.0Ah) - Amazon.com
Amazon.com : for Battery Adapter DM18M for Dewalt 20V Convert to for Makita 18V Lithium BL1830 BL1840 BL1850 14.4V- 18V Battery : Tools & Home Improvement