Milwaukee 18V to Bostitch 18V Battery Adapter

Use your Milwaukee M18 batteries on Bostitch 18V cordless tools, without buying into a second battery platform. Both run at 18V, so the adapter changes the fitting and not the voltage. Constructed from durable molded ABS with pure copper contacts, for a secure fit and dependable current transfer. It is a cost-effective way to get more from the batteries you have, with no second charger to maintain.

Specifications

• SKU PTA-MIL18-BOS18
• Fits this battery Milwaukee M18 (Lithium-Ion)
• Battery voltage 18V
• Runs these tools Bostitch 18V (Lithium-Ion)
• 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 124 g (4.4 oz / 0.27 lb)
• 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 October 12, 2025)

Why choose this adapter

• Your Milwaukee M18 battery and Bostitch 18V tools run at the same voltage, so the adapter changes the fitting rather than converting anything.
• 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.
• Covered by a 12-month warranty from the day it arrives.

Milwaukee M18 and Bostitch 18V compatibility

It works in one direction only: Milwaukee batteries powering Bostitch tools. For the opposite pairing, see adapters that run on Bostitch 18V 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 Bostitch 18V batteries.

Important charging and safety information

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

Before you buy