Stanley V20 to DeWalt 20V Battery Adapter
$33.49
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Stanley V20 to DeWalt 20V Battery Adapter
$33.49
Taxes included.
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Use your Stanley V20 batteries on DeWalt 20V MAX cordless tools, without buying into a second battery platform. Voltage is not the obstacle here — both sides are 20V. The socket is, and that is what this solves. The 3D-printed ABS housing keeps the fit precise, and pure copper contacts keep current delivery steady. It removes the need to keep separate batteries for different platforms, which saves money and simplifies the workflow.
Specifications
- Fits this battery
- Stanley V20 (Lithium-Ion)
- Battery voltage
- 20V
- Runs these tools
- DeWalt 20V MAX (Lithium-Ion)
- 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
- 128 g (4.5 oz / 0.28 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 deliveryMore details
- Revision
- Revision 01 (released on October 5, 2025)
Why choose this adapter
- Your Stanley V20 battery and DeWalt 20V MAX tools run at the same voltage, so the adapter changes the fitting rather than converting anything.
- 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.
Stanley V20 and DeWalt 20V MAX compatibility
It works in one direction only: Stanley batteries powering DeWalt tools. For the opposite pairing, see adapters that run on DeWalt 20V MAX batteries.
Compatibility can vary with the exact battery and tool model. Before ordering, confirm that your battery belongs to the Stanley V20 platform and that your tool takes DeWalt 20V MAX batteries.
Important charging and safety information
This adapter is for powering cordless tools and nothing else. It cannot charge Stanley or DeWalt 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 Stanley V20 battery.
How it works
-
1. Use the battery you own
Any compatible Stanley V20 battery you already have.
-
2. Slide on the adapter
It goes where the original DeWalt 20V MAX battery sits.
-
3. Click in and work
No tools, no wiring, no modifications.
Stanley V20 to DeWalt 20V MAX — 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 Stanley V20 battery measures off the charger with no load; 18 V is what it holds in use. DeWalt 20V MAX 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 DeWalt 20V MAX tool run as long on a Stanley V20 battery?
Runtime comes from the battery, not the adapter — a 5.0Ah Stanley V20 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 Stanley V20 battery or my DeWalt 20V MAX tool?
Used with undamaged, compatible equipment it is not expected to. Stanley V20 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 DeWalt 20V MAX 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 Stanley V20 battery off the adapter and charge it on its own charger.
Does it work with third-party Stanley 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 DeWalt 20V MAX 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 DeWalt 20V MAX tool?
128 g (4.5 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.