Amazon.com: Amityke Battery Adapter,Power Wheels Adapter for Makita 18V/14.4V Battery BL1820, BL1830, BL1840, BL1850 with 14 awg Wires Power Convertor for DIY Ride On Truck, Robotics, RC Toys and Work Lights :
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18v Makita LXT Power Pack - Cordless to Corded Conversion | Makita, Makita tools, Power pack
Makita USA - Product Details -SE00000457
Mellif Step Down DC Voltage Converter for Milwaukee 18V to 12V Battery – Mellif Tools
Makita 18v LXT Battery Backpack Adaptor PDC01 - more runtime than ever before! - YouTube