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This adapter lets Milwaukee M18 18V batteries run Hercules 20V cordless tools from Harbor Freight, so you can skip a second battery platform. It is molded ABS with copper terminals, rated 40A continuous and 80A peak, and carries built-in BMS protection that cuts power before the battery is over-drained. It suits owners with a stock of M18 packs who want to use Hercules tools without buying Hercules batteries. Against buying into the Hercules battery line, it saves duplication, but it adds a connection point and does not add a USB port or charge the packs.
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This adapter lets Milwaukee M18 lithium-ion batteries power Hercules 20V cordless tools from Harbor Freight. It works in one direction only: Milwaukee batteries powering Hercules tools.
The housing is injection-molded ABS and the terminals are copper. Internal wiring is 5 mm². The adapter is rated for 40A continuous, with 80A peak at 18VDC for up to 2 seconds. It also has a built-in battery management system (BMS) that provides battery protection.
The adapter only powers tools. It cannot charge Milwaukee or Hercules batteries and must never be connected to a charger. Remove the battery from the adapter before charging, and charge it on the original charger made for the Milwaukee M18 battery.
