Warrior 18V to Bauer 20V Battery Adapter
€27,95
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Warrior 18V to Bauer 20V Battery Adapter
€27,95
Taxes included.
Free Shipping to Germany & UK. Other European countries around €3 (local currency applied)Zero customs fees. Zero surprise taxes.
Use your Warrior 18V batteries on Bauer 20V cordless tools, without buying into a second battery platform. Built with a durable 3D-printed ABS housing and pure copper contacts — light in the hand, accurate on the fit. 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-WAR18-BAU20
- Fits this battery
- Warrior 18V (Lithium-Ion)from Harbor Freight
- Battery voltage
- 18V
- Runs these tools
- Bauer 20V (Lithium-Ion)from Harbor Freight
- Tool voltage
- 20V
- Housing
- ABS (3D)
- 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
- 97 g (3.4 oz / 0.21 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 deliveryMore details
- Revision
- Revision 01 (released on June 8, 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.
- Made for the Warrior 18V 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.
Warrior 18V and Bauer 20V compatibility
It works in one direction only: Warrior 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 Warrior 18V 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 Warrior 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 Warrior 18V battery.
How it works
-
1. Use the battery you own
Any compatible Warrior 18V battery you already have.
-
2. Slide on the adapter
It goes where the original Bauer 20V battery sits.
-
3. Click in and work
No tools, no wiring, no modifications.
Warrior 18V to Bauer 20V — Common Questions
Will my Bauer 20V tool run as long on a Warrior 18V battery?
Runtime comes from the battery, not the adapter — a 5.0Ah Warrior 18V battery lasts roughly twice as long as a 2.5Ah one, exactly as it would on its own tool. The adapter’s copper terminals and heavy-gauge wiring are there to keep resistive loss low.
Could this damage my Warrior 18V battery or my Bauer 20V tool?
Used with undamaged, compatible equipment it is not expected to. Warrior 18V batteries are lithium-ion with a protection circuit built into the battery, and it keeps working through the adapter — it stays in the battery and never moves into the adapter. Stop when the tool slows noticeably rather than running the battery flat, and stop using the adapter if it becomes unusually hot or the contacts look damaged.
Can I charge through the adapter?
No, and it should never be attempted. The adapter carries power one way only, out to the Bauer 20V tool — there is no charging circuit inside it. Connecting it to a charger puts the battery, the charger and the adapter at risk. Always take the Warrior 18V battery off the adapter and charge it on its own charger.
My Bauer 20V gear came from Harbor Freight. Is that the same platform?
Yes — Harbor Freight is where Bauer 20V is sold, so a battery or tool bought there is the platform this adapter is built for. What matters is the socket, and Harbor Freight stock is the reference for it.
Does it work with third-party Warrior batteries?
Usually. What matters is the socket, not the badge: if the battery slides on and locks the way an original does, the adapter takes it and the Bauer 20V tool runs. Aftermarket moulding does vary, so if yours looks unusual send us a photo and we will check before you order.
How much does it add to the Bauer 20V tool?
97 g (3.4 oz) and a short extension between battery and tool. You notice it overhead or in a tight cabinet; on a drill or driver held normally it disappears.