Milwaukee 18V to Bosch (Blue) 18V Battery Adapter

This adapter lets you power Bosch 18V GBA (Blue) cordless tools with the Milwaukee M18 batteries you already own. Both platforms are rated 18V, so torque and speed on the Bosch 18V GBA (Blue) tool stay where they should be. 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-MIL18-BOSB18
• Fits this battery Milwaukee M18 (Lithium-Ion)
• Battery voltage 18V
• Runs these tools Bosch 18V GBA (Blue) (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 114 g (4.0 oz / 0.25 lb)
• Dimensions (L × W × H) How It's Measured 111.5 × 70 × 49 mm (4.39 × 2.76 × 1.93 in)
• Colour Black
• 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 16, 2021)

Why choose this adapter

• Your Milwaukee M18 battery and Bosch 18V GBA (Blue) 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 Bosch 18V GBA (Blue) compatibility

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

Important charging and safety information

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