The 554,000-Unit Fire Hazard: How USB-C Charging on Power Tool Batteries Triggered the Massive Greenworks Recall

On Thursday, the U.S. Consumer Product Safety Commission (CPSC) and Greenworks Tools announced a massive recall affecting over half a million Kobalt-branded yard power tools. The issue centers on a modern convenience that ultimately backfired: a built-in USB-C charging port located directly on the tool's high-capacity lithium-ion battery. While this feature was originally designed to make the batteries more versatile for consumers, a critical flaw in the internal circuitry has turned 554,780 units into potential fire hazards. The discovery has prompted regulators to issue an immediate halt to a specific charging method, urging homeowners to check their garages before the peak of the summer lawn care season.[1][2]

The exact mechanism of the hazard is highly specific, which is why the tools themselves are not inherently dangerous during normal yard work. According to the CPSC, the danger arises when users attempt to charge the battery through its USB-C port while the battery remains inserted in the yard tool. Doing so can cause the battery's internal components to short-circuit. This electrical conflict between the tool's high-voltage motor connections and the low-voltage USB-C input bypasses the battery's safety gates, leading to rapid overheating. As long as the battery is removed from the tool before plugging in the USB-C cable, the short circuit is avoided, though regulators still advise seeking a replacement.[1]

The real-world consequences of this short circuit have already been documented across the country. Greenworks has received 34 separate reports of the batteries producing smoke, sparking, or outright catching fire while docked and charging via USB-C. Fortunately, because these incidents largely occurred in garages, sheds, or driveways away from flammable indoor furnishings, the company and the CPSC report that there have been zero injuries and no secondary property damage. Regulators are moving quickly to ensure that this streak of good luck continues by removing the defective units from circulation.[1]

The recall casts a wide net over Lowe's spring gardening lineup, affecting a broad range of equipment used by everyday homeowners. The affected products include 24-volt and 48-volt Kobalt string trimmers, leaf blowers, push mowers, self-propelled mowers, chainsaws, and pruning saws. These tools were sold exclusively at Lowe's stores nationwide and on the retailer's website between January 2026 and May 2026. The retail prices for the affected equipment ranged from $20 for standalone replacement batteries to $482 for heavy-duty, dual-battery mower kits.[1]

Identifying a recalled unit is a straightforward process for consumers. The recall strictly applies to Kobalt 24V batteries that are equipped with a USB-C charging port. These specific batteries were sold in five different capacities to accommodate various tools: 3.0Ah, 4.0Ah, 5.0Ah, 6.0Ah, and 8.0Ah. If a Kobalt battery does not feature a USB-C port, it is not included in this recall and remains completely safe to use. Consumers are encouraged to check the label on the bottom of their batteries to confirm the capacity and look for the USB-C input.[1][2]

For consumers who own the affected units, Greenworks has established a comprehensive and entirely free replacement program. Owners are instructed to immediately stop charging the batteries via USB-C while they are inserted in the tools, as this is the specific trigger for the fire hazard. By visiting the official Greenworks recall website and entering their tool's serial number, customers can easily register for a complete replacement kit without needing to visit a Lowe's store or provide a primary proof of purchase.[1][2]

The replacement package is designed to permanently eliminate the hazard by removing the problematic feature entirely. Greenworks is sending out redesigned replacement batteries that completely omit the USB-C port, ensuring that the short circuit scenario cannot be replicated. Depending on the specific tool model owned, the replacement kit may also include a dedicated charging adapter, an updated product manual, and a bright warning label to affix directly onto the yard tool to remind users of the new, safer charging protocol.[2]

Crucially, the company is taking proactive steps to ensure that the dangerous lithium-ion batteries are safely removed from circulation rather than simply discarded by consumers. The replacement kit includes a pre-paid shipping label and detailed instructions for returning the original, recalled battery in the exact same box the new one arrived in. This vital logistical step prevents the defective units from ending up in standard municipal trash or recycling centers, where damaged or short-circuited lithium-ion cells are notorious for sparking catastrophic facility fires when accidentally crushed by heavy machinery.[2]

The root cause of this recall highlights a broader transition—and a significant growing pain—within the global power tool industry. Over the past few years, manufacturers have increasingly added USB-C ports to high-capacity tool batteries, marketing them as versatile, dual-purpose devices. The consumer pitch is undeniably appealing: a massive 48V lawnmower battery can easily double as a portable power station to charge smartphones, laptops, or camping gear during a neighborhood blackout or a weekend off the grid. This added utility has become a major selling point for premium yard tools.[4]

However, merging high-draw yard equipment with delicate consumer electronics standards requires incredibly complex Battery Management Systems (BMS). A power tool battery must be capable of dumping massive amounts of current instantly to spin a heavy mower blade, while simultaneously managing the slow, carefully negotiated trickle of a USB-C input. When the battery is docked in the tool, the tool's circuitry essentially wakes up, creating an electrical pathway that the USB-C charging logic failed to properly isolate, resulting in the dangerous short circuit.[4]

The DIY and lawn care communities have reacted to the recall with a mix of frustration and pragmatic relief. On popular forums like Reddit's small engines and lawn care communities, users noted the inconvenience of losing the highly advertised USB-C functionality. However, they also praised Greenworks for executing an aggressive, no-cost replacement strategy before any serious injuries occurred. The incident serves as a cautionary tale for early adopters of cross-compatible battery technology, proving that merging two very different electrical ecosystems is harder than it looks.[3][4]

Moving forward, the CPSC's swift action on the Kobalt batteries sets a clear precedent for how regulators will handle the ongoing electrification of yard tools. As more brands attempt to turn their proprietary batteries into universal power banks, safety testing will need to rigorously account for every possible docked and undocked charging scenario. For now, Lowe's shoppers should take a few minutes to check their garages, unplug their USB-C cables, and claim their free replacements to ensure a safe summer of lawn care.[1]