Bauer 20V to AEG 18V Battery Adapter
$30.49
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Bauer 20V to AEG 18V Battery Adapter
$30.49
Taxes included.
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Use your Bauer 20V batteries on AEG 18V cordless tools, without buying into a second battery platform. Built with a durable injection-molded ABS housing and pure copper contacts for steady current delivery. Fewer battery systems in the workshop, on the bench or in the van, and no extra chargers to find room for.
Specifications
- SKU
- PTA-BAU20-AEG18
- Fits this battery
- Bauer 20V (Lithium-Ion)from Harbor Freight
- Battery voltage
- 20V
- Runs these tools
- AEG 18V (Lithium-Ion)
- Tool voltage
- 18V
- Housing
- ABS (Injected)
- Terminals
- Copper
- Current rating
- 40A continuous (80A peak at 18VDC for up to 2 seconds)
- Internal wiring
- 5 mm²
- Weight
- 113 g (4.0 oz / 0.25 lb)
- Colour
- Orange
- 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
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 AEG 18V compatibility
It works in one direction only: Bauer batteries powering AEG tools. For the opposite pairing, see adapters that run on AEG 18V 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 AEG 18V batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Bauer or AEG 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.
How it works
-
1. Use the battery you own
Any compatible Bauer 20V battery you already have.
-
2. Slide on the adapter
It goes where the original AEG 18V battery sits.
-
3. Click in and work
No tools, no wiring, no modifications.
Bauer 20V to AEG 18V — Common Questions
My battery says 20V. Can it run a tool rated differently?
Yes, and they are closer than the labels suggest. 20V is what a Bauer 20V battery measures off the charger with no load; 18 V is what it holds in use. AEG 18V tools are built around 18 V. The two numbers describe the same class of battery, which is why the adapter works rather than merely fits.
Will my AEG 18V tool run as long on a Bauer 20V battery?
Runtime comes from the battery, not the adapter — a 5.0Ah Bauer 20V 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 Bauer 20V battery or my AEG 18V tool?
Used with undamaged, compatible equipment it is not expected to. Bauer 20V 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 AEG 18V 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 Bauer 20V 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 Bauer 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 AEG 18V 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 AEG 18V tool?
113 g (4.0 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.
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