Bauer 20V to Bosch (Blue) 18V Battery Adapter
$39.89
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Bauer 20V to Bosch (Blue) 18V Battery Adapter
$39.89
Use your Bauer 20V batteries on Bosch 18V GBA (Blue) 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. Your existing batteries do more work, and there is no second ecosystem to buy into.
Specifications
- SKU PTA-BAU20-BOSB18
- Fits this battery Bauer 20V (Lithium-Ion) from Harbor Freight
- Battery voltage 20V
- 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 121 g (4.3 oz / 0.27 lb)
- 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 March 1, 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 Bauer 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.
Bauer 20V and Bosch 18V GBA (Blue) compatibility
It works in one direction only: Bauer 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 Bauer 20V 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 Bauer 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 Bauer 20V battery.