Hercules 20V to Porter Cable 18V Battery Adapter

Use your Hercules 20V batteries on Porter Cable 18V Ni-Cd cordless tools, without buying into a second battery platform. The molded ABS housing keeps it light and hard-wearing, and pure copper contacts keep current delivery steady. It keeps one battery platform serving more tools, which costs less than buying into another.

Specifications

• SKU PTA-HER20-POR18
• Fits this battery Hercules 20V (Lithium-Ion) from Harbor Freight
• Battery voltage 20V
• Runs these tools Porter Cable 18V Ni-Cd (Nickel-Cadmium)
• Tool voltage 18V
• Housing ABS (Injected)
• Terminals Copper
• Current rating 40A continuous (80A peak at 18VDC for up to 2 seconds)720 Watt continuous at 18V nominal
• Internal wiring 5 mm²
• Weight 102 g (3.6 oz / 0.22 lb)
• Colour Black, Yellow
• Operating humidity 5–95% RH
• Operating temperature -10 °C to 50 °C (14 °F to 122 °F)
• USB port No
• What's in the box Battery Adapter
• Warranty 12 months after the date of delivery
• Revision Revision 01 (released on August 20, 2026)

Why choose this adapter

• Injection-moulded ABS, not 3D printed — no layer lines to split under load.
• Solid copper terminals, so less of the current is lost as heat.
• 5 mm² internal wiring, rated for 40A continuous with 80A peak at 18VDC for up to 2 seconds, so a high-draw tool is not held back by the adapter.
• Made for the Hercules 20V batteries sold at Harbor Freight, so the fit is the one you already own.
• Covered by a 12-month warranty from the day it arrives.

Hercules 20V and Porter Cable 18V Ni-Cd compatibility

It works in one direction only: Hercules batteries powering Porter Cable tools. For the opposite pairing, see adapters that run on Porter Cable 18V Ni-Cd batteries.

Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Hercules 20V platform and that your tool takes Porter Cable 18V Ni-Cd batteries.

Important charging and safety information

This adapter is for powering cordless tools and nothing else. It cannot charge Hercules or Porter Cable batteries and must never be connected to a charger of any kind. Always take the battery out of the adapter before charging, and charge it on the original charger made for your Hercules 20V battery.