Battery Adapters

These adapters let you run tools from one battery brand on another brand's platform. We stock adapters compatible with 20V DeWalt, 18V Milwaukee, and 18V Ryobi batteries, including step-down converter versions that bring 18V or 20V packs down to 12V for use with 12V tools. Some models include a built-in fuse holder with spare fuses. Wire harness connector versions are also available for Fisher-Price and Peg-Perego ride-on toys.

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Milwaukee M18 Power Wheel Battery Adapter with 18V to 12V Step Down Converter

MWK-W1-12V20A

$25.99 $23.99 Save 8%

Milwaukee M18 Battery Adapter for Car Jump Starter | 2FT 8AWG or 6FT 10AWG Jumper Cable Kit

MWK+WD100-1-2ft/6ft

from $22.09

Starlink Mini DC Power Cable with Milwaukee 18V Battery Adapter - 3.28FT/1M

MWK-W1+DC2.1-1M

$31.99

Sale

Milwaukee 18V Battery Power Wheel Adapter with Peg-Perego Connector

MWK-BWHC-W2

$15.99 $13.99 Save 13%

Milwaukee 18V Battery Adapter for Power Wheels with Fisher-Price Compatible

MWK-BWHC-W1

$15.59

Sale

Power Wheels Battery Adapter Converter Kit for Milwaukee M18 Batteries

MWK-W1

$18.99 $15.99 Save 16%

Sale

Milwaukee 12V Conversion Kit M12 Battery Adapter for Power Wheels

M12-W1

$15.99 $11.99 Save 25%

Dewalt 20V to 12V Adapter with Step Down Converter for Power Wheels

De-W1-12V20A

$25.99

Sale

DeWalt 20V Battery Adapter with 2FT/6FT Jumper Cables | Car Jump Starter & 12V Power Cable

DE+WD100-2ft/6ft

$35.09 from $29.89 Save 15%

Starlink Mini DC Power Cable with Dewalt 18V-20V Battery Adapter - 3.28FT/1M

De-W1+DC2.1-1M

$28.99

Power Wheel Adapter for Dewalt 20V Battery Conversion for Peg-Perego Ride-Ons

De-BWHC-W2

$15.59

20V Dewalt Power Wheels Adapter with Wire Harness Connector - Fisher-Price Compatible

De-BWHC-W1

$15.59

Sale

Dewalt 20V to Power Wheels Battery Adapter Kit - 12 AWG Wire, Fuse & Connectors

De-W1

$17.99 $12.99 Save 28%

Ryobi 18V Batteries to Power Wheel Battery Adapter Kit with ON-OFF Switch

RYB-W1-FS

$14.29

Whole Set 12V Power Wheel Charger with Fisher Price Wire Harness Connector

AD-12V1A-U-FP+BWHC-W1

$20.79

Wire Harness Connector for Fisher Price Power Wheels - 12V SLA & Lithium Compatible

BWHC-W1

$10.39

DC 9V to 28V Boost Converter with DC Power Cable for Starlink Mini

DC-DC30V3.5A

$39.99

DC 12V to 57V Boost Converter with DC Cable for Starlink Gen 3 Router

DC-DC57V4.5A

$38.99

Starlink Mini SAE to DC Plug Adapter Power Cable – 18AWG – 3.28FT/1M

MINI-DC-SAE

$24.99

Starlink Mini Female XT30 to DC Plug Adapter Power Cable – 18AWG – 3.28FT/1M

MINI-DC-XT30F

$10.99

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Daier Battery Adapters: Unleash Versatility and Power Up Your Projects

Discover Daier's specialized range of battery adapters, expertly engineered to unlock new possibilities for your existing power tools and portable devices. Our adapters are designed to expand the utility of your batteries, enabling cross-brand compatibility and versatile power solutions for a multitude of applications. Whether you're extending the life of your power tool batteries or finding innovative ways to power 12V devices from higher voltage sources, Daier offers reliable and efficient battery conversion solutions.

Our extensive selection primarily focuses on power tool battery adapters, allowing you to use popular brand batteries, such as Dewalt 20V battery adapters, Milwaukee 18V battery adapters, and Ryobi 18V battery adapters, with tools or equipment from other manufacturers. This maximizes your investment in battery platforms and provides greater flexibility. A significant portion of our range also includes step-down converters and voltage reducers, specifically designed to convert higher battery voltages (e.g., 18V to 12V converters or 20V to 12V adapters) to safely power 12V tools or other low-voltage equipment.

Daier battery adapters are built for safety and durability. Many models feature integrated fuse holders with included fuses to protect against overcurrents and short circuits, safeguarding both your batteries and connected devices. Our adapters are constructed from robust, impact-resistant materials to withstand demanding use. Essential connectivity is ensured through pre-wired harnesses and common DC power plugs, facilitating straightforward, plug-and-play connections.

Beyond universal power tool conversion, our specialized battery adapters are widely adopted for:

Kids' Ride-On Toys: Powering popular children's electric vehicles, including Power Wheels battery adapters, Fisher-Price Power Wheels adapters, and Peg-Perego Power Wheels adapters, often converting 18V or 20V tool batteries to 12V for extended playtime.
DIY Projects & Robotics: Providing compact and powerful energy sources for custom builds, prototyping, and educational projects.
Portable Power Solutions: Using high-capacity tool batteries to power camping gear, portable lighting, fans, inverters, and other off-grid devices.
Emergency Backup Power: Creating versatile and reliable power sources from readily available tool batteries.
Vehicle Auxiliary Power: Connecting tool batteries to power accessories in cars, trucks, or utility vehicles.

When selecting a battery adapter, consider the specific battery brand compatibility, the required output voltage, the type of connector (e.g., barrel plug, wire harness), and whether fuse protection is included. Daier is committed to providing reliable and high-quality battery adapters that combine robust construction with efficient voltage conversion, ensuring safe and versatile power for all your projects. Explore our extensive range today to find the ideal battery conversion kit or power solution.

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Frequently Asked Questions

These adapters allow you to repurpose your existing professional 18V or 20V lithium-ion batteries (from brands like DeWalt or Milwaukee) as a high-performance power source for other devices. They are most commonly used to upgrade kids' Power Wheels toys for more speed, power DIY portable work lights, or provide 12V-24V power for off-grid electronics.

Daier offers specific adapters for the industry’s leading battery platforms, including DeWalt 20V Max, Milwaukee M18, Makita 18V LXT, and Ryobi One+ 18V. Please note that these adapters are brand-specific; for example, a DeWalt adapter will only fit a DeWalt battery due to the unique physical terminal and locking mechanism.

Yes, a direct connection from a 20V battery to a 12V device will likely cause damage. For 12V applications (like standard LED strips or 12V motors), you must use an adapter kit that includes a DC-DC Step-Down (Buck) Converter. This module safely regulates the 18V-20V input down to a steady 12V output. We offer both "Direct Output" and "12V Regulated" versions to suit your project needs.

Most basic adapters provide a mechanical and electrical connection but do not include a low-voltage cutoff circuit. Since lithium-ion batteries can be permanently damaged if drained too low, it is highly recommended to monitor the battery level or install a Low Voltage Disconnect (LVD) module. Some of our premium kits include an integrated fuse and switch to add an extra layer of protection and control.

No, it is a very popular DIY project. Most of our kits come pre-wired with high-quality 12AWG or 14AWG silicone wire, heat-shrink terminals, and inline fuse holders. This allows for a "Plug-and-Play" experience—simply secure the adapter to the vehicle's chassis, connect the wires using the included terminals, and insert your battery.

No. These adapters are designed for discharge only. Never attempt to charge your power tool batteries through these adapters using a generic charger. Always use the original manufacturer’s charger to ensure the battery cells are balanced and charged safely.