Ryobi makes several AC Inverters and USB chargers. The 40V battery RYi300BG is nice because it has a 300W Pure Sine wave inverter, a USB Type C port 5/9/12/20 VDC rated at 2A, and a USB type A port rated at 3A. Unfortunately it doesn't have a regulated 13.8VDC Cigarette Lighter Socket. This adapter adds that functionality.
It can be used with my 18V battery adapter ( https://www.prusaprinters.org/prints/42031-ryobi-18v-to-40v-battery-adapter ) or with SorrowBJD's Battery Adapter for Ryobi 40V battery( https://www.thingiverse.com/thing:3561617 )
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The author marked this model as their own original creation.