Weird Products That Run on Power Tool Batteries

Power tool batteries—especially 18V and 20V MAX lithium-ion packs—have become a surprising power source for dozens of non-tool products, from heated jackets to camping coffee makers. This article lists some of the most unusual items that run on these batteries, explains how they work, and helps you decide if they’re worth buying.

Why Power Tool Batteries Became a Universal Power Source

The rise of weird battery-powered products is a direct result of two trends: the popularity of cordless power tools and the falling cost of lithium-ion cells. Most major tool brands (like DeWalt, Milwaukee, Ryobi, and Makita) sell bare tools without batteries, which means millions of people already own compatible packs. Instead of buying a separate proprietary battery for every gadget, manufacturers saw an opportunity to tap into that existing ecosystem.

Another reason is the sheer capacity. A modern 18V/20V battery pack holds roughly 40–90 watt-hours (Wh) of energy—enough to run a small fan for several hours or charge a phone multiple times. That’s far more than a typical USB power bank, and it’s already ruggedized for job-site use. For consumers, it means one battery can power a drill, a work light, and a camping cooler, reducing clutter and cost.

Heated Clothing and Gear

One of the most popular categories is heated apparel. Heated jackets, vests, gloves, and even heated insoles now come with a pocket and a cord that plugs directly into a power tool battery. Brands like Milwaukee and DeWalt make their own heated hoodies and jackets, but third-party companies also sell adapters that let you use any 18V/20V battery with generic heated clothing.

These garments typically have carbon-fiber heating elements in the chest, back, or hands, controlled by a small switch or app. A 5Ah battery can provide several hours of warmth on a medium setting, which is useful for outdoor work, hunting, or winter sports. Some heated blankets and mattress pads also run on tool batteries, making them portable for camping or tailgating.

Camping and Outdoor Gear

Campers and overlanders have embraced the tool-battery ecosystem. You can now find:

• Portable coffee makers that brew a cup using a 20V battery
• Electric coolers that keep food cold for days without ice
• Inflatable air mattresses and paddle boards with battery-powered pumps
• Portable fans that clip to a tent pole or hang from a ceiling
• String lights and lanterns that use the same battery as your drill

These products are especially appealing because they eliminate the need for separate fuel canisters or 12V car adapters. A single 18V battery can run a small fan all night or power a coffee maker for several brews. Many campers also use an inverter adapter that converts the battery’s DC output to AC, allowing them to plug in standard appliances—though that requires a larger battery and is less efficient than a dedicated DC device.

Home and Workshop Gadgets

Beyond the outdoors, tool batteries have found their way into everyday household items. Some of the more unusual examples include:

• Battery-powered soldering irons that heat up in seconds
• Portable vacuum cleaners (though most have their own batteries)
• Electric screwdrivers and impact drivers (obviously, they’re tools)
• Battery-powered caulking guns and glue guns
• Portable work lights and task lamps
• Battery-powered fans for cooling yourself in a workshop or garage

Some brands even sell battery adapters that let you power a laptop or charge your phone from a tool battery—useful for remote work or emergencies. These adapters typically have a USB-C or DC output and include voltage regulation to protect your devices.

How Do They Work? The Adapter and Voltage Question

Most power tool batteries output a nominal voltage of 18V (marketed as 20V MAX for some brands, which is the same physical battery—the difference is just marketing). Some brands, like Ryobi, use 18V, while others like Milwaukee use 18V or 12V. To power a device that expects a different voltage, manufacturers include a voltage regulator or buck converter inside the product or adapter.

For example, a heated jacket might have a heating element rated for 12V, so it includes a small circuit that steps down the 18V battery. Similarly, a USB charger adapter will regulate the voltage to 5V for phones. This is why you can’t just wire a battery directly to any device—you need the correct adapter or the device must be designed for that specific voltage.

When buying a non-tool product that runs on tool batteries, check the compatibility: it must match your battery’s physical shape (the slide-on mount) and voltage. Most brands use a proprietary connection, so a DeWalt battery won’t fit a Milwaukee product without an adapter.

How to Choose: Compatibility, Capacity, and Cost

Before buying any battery-powered gadget, consider these factors:

• Battery compatibility: Does the product accept your brand’s batteries? Some products are brand-specific, while others use a universal adapter that accepts multiple brands.
• Voltage and Ah rating: Higher voltage (e.g., 18V vs 12V) generally means more power, but also more weight. Higher amp-hour (Ah) means longer runtime but a heavier battery.
• Runtime: Estimate how long you need the device to run. A 5Ah battery has 90Wh of energy (18V × 5Ah). If a device draws 10W, it will run for about 9 hours (90Wh / 10W).
• Cost: The product itself may be cheaper than a dedicated battery-powered version, but you’re already invested in the tool ecosystem. If you don’t own the tools, buying a battery and charger just for a gadget might not be economical.
• Safety certifications: Look for UL or CE marks on the product and the battery. Cheap adapters without proper protection can overheat or damage your battery.

Common Problems and Safety Concerns

While these products are convenient, there are some pitfalls to watch out for:

• Battery drain: Some devices (like fans or heaters) can drain a battery faster than expected. Always check the wattage and compare it to your battery’s capacity.
• Heat damage: Lithium-ion batteries can overheat if discharged too quickly or used in high temperatures. Avoid leaving them in direct sunlight or using them at maximum load for extended periods.
• Physical damage: Dropping a battery or exposing it to water can cause short circuits. Keep the contacts clean and dry.
• Non-standard adapters: Some third-party adapters may not have proper overcurrent protection, which can damage your battery or the device. Stick to reputable brands or those with safety certifications.
• Voltage mismatch: Using a 20V battery on a device designed for 18V is usually fine (they’re the same), but using a 12V battery on an 18V device will not work and may damage the device.

Alternatives: USB Power Banks and 12V Accessories

If you don’t already own power tool batteries, or if you want a more portable option, consider USB power banks. They’re cheaper, lighter, and can charge phones and small devices, but they lack the capacity and voltage of a tool battery. For camping, a 12V car accessory socket (cigarette lighter) can power many of the same devices if you have a car or a portable power station.

Another alternative is a dedicated portable power station (like a Jackery or Goal Zero), which is essentially a large battery with AC, DC, and USB outputs. These are more expensive but offer higher capacity and can run larger appliances. However, they’re not as modular as tool batteries—you can’t swap out a depleted pack for a fresh one.

Frequently Asked Questions

Can I use any power tool battery with any product?

No. The battery must physically fit the product’s mount and have the correct voltage. Most brands have proprietary connections, so a DeWalt battery won’t fit a Milwaukee product without an adapter. Some third-party adapters exist, but they may lack safety features.

How long will a battery last in a heated jacket?

It depends on the jacket’s wattage and the battery’s capacity. A typical heated jacket draws 20–40W on high. A 5Ah 18V battery (90Wh) would last about 2.25 hours on high (90Wh / 40W) and longer on lower settings. Always check the product’s specifications for runtime estimates.

Is it safe to use a power tool battery in a non-tool device?

Yes, if the device is designed for it and has proper voltage regulation and overcurrent protection. Avoid DIY wiring without a proper adapter, as it can cause short circuits, overheating, or fire.

Can I charge my phone with a power tool battery?

Yes, using a USB adapter that plugs into the battery. These adapters step down the voltage to 5V for USB devices. They’re available from most tool brands and third-party companies.

What does “20V MAX� mean? Is it the same as 18V?

Yes, “20V MAX� is a marketing term used by some brands (like DeWalt) for batteries that actually have a nominal voltage of 18V. The “max� refers to the initial voltage when fully charged, which can be around 20V. So, a 20V MAX battery is electrically the same as an 18V battery.

Can I use a higher Ah battery to get longer runtime?

Yes, higher amp-hour (Ah) batteries have more capacity and will run a device longer. For example, a 5Ah battery has 50% more capacity than a 3Ah battery. Just make sure the battery physically fits and is not too heavy for the device.

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