Best Tool Battery Inverters (DeWalt, Milwaukee, Makita)

If you already own cordless tools, you already own a stack of emergency batteries. A tool battery inverter snaps onto an 18V or 20V pack and turns it into a 120V outlet for small loads like a fan, a lamp, a router, a laptop or a phone charger. They are quiet, fume-free and safe indoors, but small: these run about 175 to 300 watts, so they will not run a fridge, microwave or space heater. The waveform matters. Our top pick, the MillerTech 300W, puts out a pure sine wave and works with DeWalt, Milwaukee or Makita batteries, which makes it the better choice for a CPAP or sensitive electronics. The Milwaukee M18 TOP-OFF and DeWalt DXAEPIP2W are cheaper, modified sine options for phones, laptops, fans and lights.

★ Top Pick

MillerTech 300W Pure Sine Power Tool Battery Inverter

Why it's herePure sine 120V output from DeWalt 20V/FLEXVOLT, Milwaukee M18 or Makita LXT batteries, so it is the safer choice for CPAPs, laptops and other sensitive electronics. 300W continuous with low-voltage cutoff to protect the battery, and a 1-year warranty.

Troy's pick (Brand)

No independent review used. Two versions at $144: DeWalt/Milwaukee and Makita; pick the one for your batteries. Cannot charge tool batteries. Verified Oct 19 2026.

~$144Price checked Oct 20, 2026at store.ldsreliance.com

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Compare all 3 picks

Rank	Product & source	Key note	Price
★ Top Pick	MillerTech 300W Pure Sine Power Tool Battery InverterTroy's pick (Brand)	Pure sine 120V output from DeWalt 20V/FLEXVOLT, Milwaukee M18 or Makita LXT batteries, so it is the safer choice for CPAPs, laptops and other…	~$144Price checked Oct 20, 2026at store.ldsreliance.com View product
Runner-up	Milwaukee M18 TOP-OFF 175W Power Supply (2846-20)Recommended by Home Depot customers (4.6/5, 2,060 reviews)	Snaps onto any M18 battery for one 120V outlet plus 45W USB-C and USB-A, and has a 5-year warranty.	~$119Price checked Oct 15–19, 2026at homedepot.com View product
Runner-up	DeWalt 2-Way 225W Power Inverter (DXAEPIP2W)Troy's pick (Brand)	Budget pick for DeWalt 20V MAX and FLEXVOLT owners: 225W from a battery (200W at the AC outlet) or 140W from a car 12V socket, plus USB-C and USB-A.	~$69.98Price checked Oct 15–19, 2026at homedepot.com View product

⚡ Modified sine wave inverters (the Milwaukee and DeWalt picks) can struggle with CPAPs, some laptops and other sensitive electronics. Use a pure sine model like the MillerTech for those, check your device manual, and keep loads under the rated watts.