What was recalled
The U.S. Consumer Product Safety Commission (CPSC) has issued a recall concerning specific lithium-ion batteries designed for the Sublue Mix underwater scooter. This action involves both the original batteries installed in the scooters and separate replacement batteries that were sold for this device. The primary issue lies with the battery technology itself, specifically those units that are black in color. While the underwater scooters themselves come in various aesthetic finishes—specifically Arctic White, Space Blue, and Aqua Blue—the critical identifier for this recall is the battery component, which must be black to fall under this safety notice.
To help you identify if your device is part of this recall, look closely at the scooter’s exterior. The brand name "Sublue" is printed on the top surface of the unit. On the side of the scooter, you should see the text "Whiteshark Mix Underwater Scooter." These devices are designed for gliding through water, providing a unique recreational experience for divers and snorkelers. However, the safety concern is located on the underside of the scooter, where the battery compartment is situated. It is essential to inspect this area and the batteries themselves to determine if they match the recalled specifications.
The scope of this recall includes certain Sublue Mix underwater scooters that were sold with the affected lithium-ion batteries. The agency has documented 161 reports of thermal and swelling incidents associated with these specific batteries. Among these reports, there have been eight instances of fire, one report of personal injury, and two cases of property damage totaling $651,400. These figures underscore the seriousness of the defect and the necessity for immediate identification and remediation.
If you own a Sublue Mix underwater scooter, it is crucial to verify whether your battery is among those recalled. The recall applies to batteries that are black only. If your battery is not black, it may not be part of this specific safety notice, but it is always wise to check the official recall details for confirmation. The CPSC emphasizes that consumers should stop using the scooters with the recalled batteries immediately to prevent potential fire hazards. For more information on how to proceed with the remedy, including contact details for Sublue and instructions for returning the defective battery, please refer to the subsequent sections of this article.
The hazard, explained
When we talk about a fire hazard involving lithium-ion batteries, it is helpful to understand the specific physical mechanisms at play rather than just accepting that "batteries can catch fire." In the case of the Sublue Mix underwater scooters, the core issue lies in the thermal stability of the battery cells themselves. The Consumer Product Safety Commission (CPSC) reports that these lithium-ion batteries are prone to overheating and swelling. This is not merely a minor inconvenience; it indicates a breakdown in the internal chemistry of the cell.
Lithium-ion batteries rely on precise separation between their positive and negative components to function safely. When a defect occurs—whether due to manufacturing irregularities, internal short circuits, or material degradation—the battery can enter a state known as "thermal runaway." During thermal runaway, the temperature inside the battery cell rises uncontrollably. As heat builds up rapidly, it can melt the internal separators that keep the chemical reactions in check. Once these barriers fail, the battery generates even more heat in a self-perpetuating cycle. This is what leads to the swelling you might observe; gases produced by the decomposing electrolyte inside the cell cause the battery casing to expand like an overinflated balloon.
The danger escalates when this swelling or overheating breaches the external casing of the battery. If the internal pressure becomes too great, or if the heat ignites the flammable electrolyte fluid within, you are left with a direct fire hazard. According to Sublue’s data shared with the CPSC, this physical failure mode has already resulted in eight confirmed reports of fire involving these specific batteries. The swelling incidents serve as an early warning sign that the internal structure is collapsing, but by the time ignition occurs, the risk shifts from a battery malfunction to an active fire event.
Why does this matter for you? Because underwater scooters are often used in close proximity to the body and potentially near flammable materials on boats or docks. A battery that ignites can release toxic fumes and intense heat in a very short amount of time. The CPSC data highlights that this is not just a theoretical risk; there have been reports of property damage totaling $651,400 and at least one injury linked to these failures. Understanding that the root cause is internal thermal instability helps explain why simply "recharging" or "using it less" will not fix the problem. The physical integrity of the cell is compromised, making immediate cessation of use critical to preventing a minor defect from becoming a major safety incident.
Who is most at risk
The Sublue Mix underwater scooter is designed for recreational use in lakes, oceans, and pools, meaning the individuals most immediately at risk are those who enjoy water sports, diving, or simply looking for a fun way to glide beneath the surface. Because these devices are marketed toward adults and older children seeking an enhanced swimming experience, the primary group of consumers involved in this recall is anyone who purchased a Sublue Mix scooter—specifically those with the black lithium-ion batteries—and continues to use them in aquatic environments. The hazard stems from the battery compartment located on the underside of the unit, which means the defect is exposed to water and physical impact during normal operation. Consequently, any owner who has not yet inspected their device or who is actively using a scooter with a black battery pack faces the potential for thermal events while engaged in water activities.
While the product is generally intended for capable swimmers, certain demographics face heightened vulnerability due to the nature of lithium-ion battery failures. Individuals with limited mobility, such as the elderly or those with physical disabilities who rely on such devices for assisted movement in water, are at significant risk. If a battery were to swell or ignite, it could cause sudden loss of propulsion or buoyancy control, potentially leading to drowning or injury in deep water where immediate surface assistance is difficult. Similarly, children and teenagers who may lack the maturity to recognize early warning signs of battery failure—such as unusual heat, hissing sounds, or visible swelling—are particularly vulnerable. They might continue using a compromised device until it fails catastrophically, rather than recognizing the danger and stopping use immediately.
Furthermore, the risk extends beyond just the user to anyone in close proximity during charging or storage. The recall notes that 161 reports of thermal and swelling incidents have been received, including eight fires. Lithium-ion batteries, when damaged or defective, can enter a state known as thermal runaway, where they generate intense heat rapidly. If a consumer stores their scooter indoors, near bedding, curtains, or other flammable materials, the risk to property and personal safety increases dramatically. Families living in homes with limited fire escape routes or those with young children who might accidentally handle a damaged battery are at greater risk of severe injury or property damage. The reported incidents include one injury and $651,400 in property damage, underscoring that this is not merely an inconvenience but a serious safety threat requiring immediate attention from all current owners, regardless of their age or swimming proficiency.
How to tell if you have the recalled item
Verifying whether your Sublue Mix underwater scooter is part of this specific safety recall requires a careful visual inspection of both the main unit and its power source. Because the issue is isolated to particular components rather than every single product ever made by Sublue, checking for precise physical markers is the most reliable way to confirm your status. Start by locating the battery compartment, which is situated on the underside of the scooter body. This is where you will find the primary identifier: the color of the lithium-ion battery itself. The recall explicitly covers units equipped with black batteries only. If your scooter currently has a gray battery installed, it is not part of this specific recall batch, as Sublue has already implemented a remedy involving a new generation gray battery for those units.
Next, examine the exterior casing of the scooter to ensure you have the correct model. The recalled scooters were marketed under the "Sublue" brand and specifically identified as the "Whiteshark Mix Underwater Scooter." You should look for the word "Sublue" printed clearly on the top surface of the device. On the side of the unit, verify that the text "Whiteshark Mix Underwater Scooter" is present. It is important to note that while the battery in question must be black, the scooter bodies themselves were sold in three distinct color options: arctic white, space blue, and aqua blue. Therefore, the color of your scooter’s body does not determine whether it is recalled; only the battery color and model designation matter.
If you are unsure about the age or origin of your device, consider when and where it was purchased, though this is secondary to the physical inspection. The recall, announced on March 13, 2025, targets certain Sublue Mix underwater scooters and their replacement batteries sold previously. These devices are designed for gliding through water, making them popular among divers and snorkelers. To be absolutely certain, do not rely solely on purchase receipts or general model names. Instead, physically check the battery compartment under the scooter. If you see a black lithium-ion battery in a Sublue Whiteshark Mix Underwater Scooter (available in arctic white, space blue, or aqua blue), you possess a recalled item and should stop using it immediately. For final confirmation or if the markings are worn, contact Sublue directly at 855-206-8698 or visit their recalls page online.
What to do — step by step
If you own a Sublue Mix Underwater Scooter, your immediate priority is safety, not convenience. The first and most critical step is to stop using the scooter with the recalled black batteries immediately. Do not wait for a replacement kit to arrive before taking action. Lithium-ion batteries that have demonstrated thermal issues are unpredictable; continuing to charge or use them significantly increases the risk of overheating or ignition. Treat the device as inactive until you have secured the proper replacement from Sublue.
Next, you need to initiate the remedy process by contacting Sublue directly. You can reach their consumer support team toll-free at 855-206-8698. Their representatives are available around the clock, operating from 9 a.m. to 5 p.m. Pacific Time, Monday through Sunday. Alternatively, you may send an email to support.us@sublue.com or visit their dedicated recall portal at www.sublue.com/recalls. If you prefer to navigate their main site, look for the "Recalls" link located at the top of the page. When you contact them, clearly state that you have a Sublue Mix Underwater Scooter with the black battery and wish to participate in the recall program.
Once you have registered your claim, Sublue will facilitate the exchange process. They will provide you with a specific battery collection kit designed for safe transport. It is vital that you use this kit rather than attempting to ship the battery on your own. The recalled batteries are considered potentially hazardous materials due to their instability. By using the manufacturer-provided kit, you ensure that the battery is contained and protected against short circuits or physical damage during transit. You will only receive your free new generation gray battery replacement after Sublue confirms they have received your returned recalled black battery.
A crucial part of this process involves proper disposal instructions. Do not throw the recalled black battery in your regular household trash. Furthermore, do not place it in standard used battery recycling boxes found at retail stores or home improvement centers. These general recycling streams are not equipped to handle damaged or defective lithium batteries safely. Instead, you must follow the procedures established by your local municipal recycling centers for damaged or recalled lithium batteries. If you are unsure how to dispose of it locally, consult your city or state ordinances regarding hazardous waste disposal for lithium-ion cells. This careful handling protects sanitation workers and environmental systems from potential fire hazards associated with improperly discarded power sources.
Your refund, repair, or replacement options
If you own a Sublue Mix Underwater Scooter equipped with the recalled black lithium-ion batteries, your primary remedy is not a cash refund, but a free hardware replacement designed to restore safety without requiring you to purchase a new device. The manufacturer, Sublue, has committed to providing a "new generation" battery in gray as a direct substitute for the defective units. This approach ensures that you can continue using your scooter with peace of mind, knowing that the specific thermal and swelling risks associated with the original black batteries have been addressed through an upgraded component.
To initiate this process, you must contact Sublue directly rather than returning the item to the retail store where it was purchased. You have three convenient ways to reach their support team: call their toll-free number at 855-206-8698, send an email to support.us@sublue.com, or visit their official website at www.sublue.com/recalls. The recall page on their site also features a dedicated "Recalls" link in the top navigation bar for additional information. Support is available around the clock, from 9 a.m. to 5 p.m. Pacific Time, Monday through Sunday, ensuring you can get assistance regardless of when you discover the issue.
The replacement process involves a specific exchange protocol designed to handle hazardous materials safely. Sublue will provide you with a specialized battery collection kit to securely package and return your recalled black battery. It is important to understand that you will receive your new gray replacement battery only after you have returned the defective unit. This "return before receipt" structure is standard for lithium-ion battery recalls because these components pose significant risks during transit if not handled correctly.
A critical part of this remedy is how you handle the old battery while waiting for instructions. Do not attempt to dispose of the recalled black battery in your household trash or place it in standard used battery recycling boxes found at retail stores. These batteries are classified as damaged or defective and require special handling according to local and state ordinances. Municipal recycling centers have specific procedures for such hazardous items, which differ significantly from normal battery disposal. By following Sublue’s instructions and using their provided collection kit, you ensure that the potential fire hazard is contained until it can be professionally processed.
This remedy reflects the severity of the incidents reported, including eight fires and one injury. By opting for a free replacement rather than a refund, Sublue acknowledges that the product itself may still function correctly when paired with safe components. However, the integrity of the safety system relies entirely on using their authorized gray battery. Attempting to use third-party batteries or ignoring the recall could void any safety guarantees and leave you vulnerable to the overheating risks that prompted this action in the first place.
While waiting for your replacement, the safest course of action is to stop using the scooter with the recalled battery immediately. The remedy process can take time due to shipping and verification steps, so planning ahead is essential. Keep the collection kit accessible but stored safely away from flammable materials until you are ready to ship it back. By following these steps precisely, you not only protect yourself and your property from potential fire hazards but also contribute to the broader effort of removing defective lithium-ion batteries from circulation.
What can happen if you ignore it
It is easy to think that a faulty battery is just an inconvenience—a dead device or a minor glitch until you get it fixed. However, with the Sublue Mix underwater scooters and their specific lithium-ion batteries, ignoring the recall transforms that inconvenience into a genuine safety emergency. The core issue here is thermal runaway. When these particular batteries overheat, they do not simply stop working; they enter a state of uncontrolled chemical reaction. This process generates intense heat rapidly, which can cause the battery casing to swell, rupture, or ignite. If you continue to use the recalled black batteries, you are essentially carrying a potential fire starter in your pool, on your boat, or in your garage.
The consequences of ignoring this warning are not theoretical. Sublue has already documented 161 reports of thermal and swelling incidents involving these specific components. Among these reports, there have been eight confirmed fires. While the number may seem small relative to the total units sold, each fire represents a real-world event where property was damaged and lives were put at risk. The data also confirms that this hazard has moved beyond equipment damage: there is one reported injury and two instances of property damage totaling $651,400. This means that for every person who ignores the recall, they are rolling the dice on a scenario where their home could burn, their vehicle could be destroyed, or they could suffer physical harm from burns or toxic fumes.
Beyond the immediate risk of fire, there is a secondary danger related to disposal and storage. Many consumers assume that if a battery stops working, it can be tossed in the regular trash or placed in a standard drop-off bin at a store. This is extremely dangerous with recalled lithium-ion batteries. If you ignore the recall instructions and simply discard these faulty units improperly, the remaining chemical energy in the cells can trigger fires in garbage trucks, waste management facilities, or recycling centers. These fires are difficult to extinguish and can cause significant environmental contamination and infrastructure damage. You might not see the fire yourself, but your decision to ignore the remedy contributes to a larger public safety hazard.
Finally, consider the context in which these scooters are used. They are often stored in homes near other flammable materials or kept in damp environments like pool areas. A battery that ignites in such a confined space can spread smoke and flames before you even realize what is happening. The recall provides a free replacement, yet choosing to keep the defective unit means you are prioritizing short-term convenience over long-term safety. The risk of losing your property or suffering injury is far greater than the effort required to contact Sublue and swap out the battery. Do not wait for an incident to become personal; act now to ensure that your underwater adventures remain safe.
Staying safe: broader tips
While this specific recall addresses a critical failure in the Sublue Mix underwater scooter’s power system, the underlying issue—thermal runaway in lithium-ion batteries—is a widespread concern across countless devices we use daily. From electric vehicles and power tools to smartphones and laptops, these energy-dense cells are incredibly efficient but require careful handling to remain safe. Understanding how to identify early warning signs and practicing proper storage habits can prevent similar incidents in your own home.
The most important step in preventing lithium-ion battery fires is vigilance during the charging process. Never leave devices charging unattended for long periods, especially overnight or while you are asleep. If a device becomes unusually hot to the touch, makes a hissing sound, or shows visible swelling of the casing, disconnect it immediately from the power source and move it to a non-flammable surface outdoors, away from structures and other flammable materials. Do not attempt to puncture, crush, or continue using a swollen battery, as this can trigger immediate ignition.
Proper storage is equally critical. Lithium-ion batteries should be kept in a cool, dry place, ideally at room temperature. Extreme heat, such as leaving a device in a parked car on a sunny day, significantly degrades battery integrity and increases the risk of thermal events. If you are storing devices for extended periods, ensure the battery charge is between 40% and 60%. Storing batteries completely depleted can lead to deep discharge damage, while storing them at 100% capacity accelerates chemical aging.
Furthermore, always use only the manufacturer-approved chargers and cables. Third-party or damaged charging accessories may not regulate voltage and current correctly, leading to overheating. Regularly inspect your power cords for fraying, exposed wires, or burn marks. If you notice any discoloration around charging ports or outlets, stop using that equipment immediately.
Finally, stay informed about product safety beyond individual recalls. Sign up for notifications from the U.S. Consumer Product Safety Commission (CPSC) via their website to receive alerts about new recalls in your area. Additionally, consider installing smoke and carbon monoxide detectors on every level of your home, testing them monthly, and replacing batteries annually. These simple, proactive measures create a vital layer of protection that complements product safety efforts.