For 2Pack Makita 18v Battery 6ah with Makita Inverter Turn to 110V
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Makita - BL1850B 18V LXT Lithium-Ion 5.0Ah Battery
It charges faster and works longer than standard lithium-ion batteries, giving cordless tools unmatched performance and productivity. The Makita 5.0Ah battery has a charge time of only 45 minutes, so it spends more time working and less time sitting on the charger. The 18V LXT 5.0Ah battery is compatible only with Star Protection tools, indicated by the Star Symbol and/or Yellow Battery Receiver under the tool.
Makita BL1850B LXT Lithium-Ion Battery - 2 pack
18v battery rebuild suggestions : r/Makita
Makita USA - Product Details -BL1850B-10
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Badaptor Makita Battery Adapter to Ryobi 18v One+ Works with Ryobi