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DM18M Adapter converts for Dewalt 20V Lithium Battery and for Milwaukee 18V M18 Lithium Battery to for Makita 18V Lithium Battery BL1830 BL1840 BL1850 - - Amazon.com
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Amazon.com: 2Packs Upgraded to 6.0Ah 18V BL1860B Li-ion Replacement Battery Compatible with Makita 18V Battery BL1815 BL1830 BL1835 BL1840 BL1850 BL1860 LXT400 194205-3 Fit Cordless Power Tools : Tools & Home Improvement
Amazon.com: Upgrade 18V 6000mAh BL1860 Battery Replace for Makita BL1860B BL1860B-2 BL1850 BL1850B BL1840 BL1840B BL1830 BL1830B BL1820 BL1815 BL1815B LXT-400 194204-5 Drill Tools with LED Indicator (1Pack) : Tools & Home