Amazon.com: TURPOW 2 Packs 6.5 Ah Replace for Makita 18V Battery & Double Rapid Charger Combo, Compatible with BL1815 BL1830 BL1840 BL1850 BL1860 for Makita 18Volt Batteries LXT Lithium ion Cordless Tools :
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Amazon.com : Powtree BL1815 18V 3.0Ah LXT Lithium-ion Replacement Battery for Makita BL1815 BL1830 BL1860 BL1850 BL1840 BL1850B-2 BL1845 BL1815 BL1820 BL1860B Cordless Power Tools Series : Tools & Home Improvement