Bosch (Blue) 18V to Bauer 20V Battery Adapter
$39.89
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Bosch (Blue) 18V to Bauer 20V Battery Adapter
$39.89
Use your Bosch 18V GBA (Blue) batteries on Bauer 20V 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-BOSB18-BAU20
- Fits this battery Bosch 18V GBA (Blue) (Lithium-Ion)
- Battery voltage 18V
- Runs these tools Bauer 20V (Lithium-Ion) from Harbor Freight
- Tool voltage 20V
- 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 108 g (3.8 oz / 0.24 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 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.
- Covered by a 12-month warranty from the day it arrives.
Bosch 18V GBA (Blue) and Bauer 20V compatibility
It works in one direction only: Bosch batteries powering Bauer tools. For the opposite pairing, see adapters that run on Bauer 20V batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Bosch 18V GBA (Blue) platform and that your tool takes Bauer 20V batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Bosch or Bauer 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 Bosch 18V GBA (Blue) battery.