Milwaukee 18V to Earthquake XT 20V Battery Adapter

Use your Milwaukee M18 batteries on Earthquake 20V XT cordless tools, without buying into a second battery platform. Injection-molded ABS on the battery side, precision 3D-printed ABS on the tool side, and pure copper contacts for steady current delivery. This helps you get the most out of your existing battery system while avoiding the cost of another set of batteries and chargers.

Specifications

• SKU PTA-MIL18-EQX20
• Fits this battery Milwaukee M18 (Lithium-Ion)
• Battery voltage 18V
• Runs these tools Earthquake 20V XT (Lithium-Ion) from Harbor Freight
• Tool voltage 20V
• Housing ABS
• 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 119 g (4.2 oz / 0.26 lb)
• Dimensions (L × W × H) How It's Measured 114 × 76 × 55 mm (4.49 × 2.99 × 2.17 in)
• Colour Black, Red
• 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 10, 2026)

Why choose this adapter

• 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.
• Covered by a 12-month warranty from the day it arrives.

Milwaukee M18 and Earthquake 20V XT compatibility

It works in one direction only: Milwaukee batteries powering Earthquake tools. For the opposite pairing, see adapters that run on Earthquake 20V XT batteries.

Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Milwaukee M18 platform and that your tool takes Earthquake 20V XT batteries.

Important charging and safety information

This adapter is for powering cordless tools and nothing else. It cannot charge Milwaukee or Earthquake 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 Milwaukee M18 battery.