The Non-Financial Ledger: What a Power Bank Is Supposed to Be

A power bank is one of the most ordinary objects in modern life. You charge it overnight on your nightstand. You toss it in your bag before a flight. You hand it to your kid in the backseat. You plug it in on your desk while you work. It sits next to your keys, your wallet, your phone. It is, by design, a thing you stop thinking about.

That is exactly what Barbara Yim was doing in November 2022 when she ordered a Charmast W1056 from Amazon. She needed a portable charger. She saw a product marketed as safe. She paid her money. She trusted the product to do what it said it would do and nothing else.

What she did not know — what Charmast made sure she could not know — was that the battery inside her new charger had a defect that could cause it to overheat and catch fire. Not in some rare, freak-accident scenario. The complaint describes the hazard as inherent to the product’s design and formulation. The danger was baked in from the factory floor.

Think about where people keep power banks. On bedside tables while they sleep. In backpacks with school laptops and textbooks. In diaper bags. In jacket pockets on crowded trains. In gloveboxes. On airplane tray tables. The CPSC recalled this product specifically because it poses fire and burn hazards. That is the government’s language. Fire. Burns. This is not a product that might cause mild inconvenience. This is a product that can ignite near your body, your belongings, your children, your home.

The complaint makes clear that Charmast was aware that other manufacturers had already solved this problem. Safer designs and production methods existed. They were available to Charmast. The company chose not to use them. It chose instead to keep selling the W1056 in six colors on the world’s largest retail platform, from December 2018 until a recall forced them to stop in September 2024. Nearly six years. For nearly six years, people brought this product into their homes without knowing what it was.

The lawsuit does not describe any individual fire incidents from the available source text, but the CPSC recall footnoted in the complaint exists precisely because the hazard has been documented. Recalls are not precautionary suggestions. They are issued after evidence of harm. The betrayal here is not just financial. It is the specific violation of trust that happens when an ordinary purchase turns out to be a hazard hiding in plain sight — and someone who knew said nothing.

The Defect: What Went Wrong Inside the W1056

The Charmast W1056 was marketed and sold as a standard portable charger. The complaint identifies the root cause of the hazard plainly: the lithium-ion battery inside the product can overheat and ignite.

• The W1056 was sold in six colors: black, blue, green, mint, pink, and white. Every version carried the same defective internal battery. The brand name “Charmast” was printed on the front; the model number W1056 was printed on the back.
• The defect is described as inherent to the product’s design and formulation, meaning it was present in the product from the moment it left Charmast’s control. The products “were defective when they left the exclusive control of Defendant,” according to the complaint.
• The hazard is specifically a lithium-ion battery failure mode: overheating leading to ignition. This is the same failure mechanism responsible for aircraft restrictions on battery-powered devices, product recalls across multiple electronics categories, and numerous documented house fires globally.
• The complaint states that the defect “was undiscoverable” by consumers at the time of purchase and at any point during the class period. There was no external sign, no warning light, no way for a buyer to detect the danger before it potentially manifested.
• Charmast’s own competitors had already solved this problem. The complaint notes that “other manufacturers formulate, produce, and sell non-defective portable chargers with formulations and production methods that do not cause the product to overheat and ignite.” The fix was available. Charmast did not apply it.
• The complaint is explicit that “feasible alternative formulations, designs, and materials are currently available and were available to Defendant at the time the Product was formulated, designed, and manufactured.” This is not a case of unknown science. The safer path was known. It was not taken.
• The U.S. Consumer Product Safety Commission issued a formal recall. The CPSC recall notice, cited in the complaint’s footnotes, describes the product as posing “fire and burn hazards.” It identifies the sales channel as exclusively Amazon.com and the sales window as December 2018 through September 2024.

Legal Receipts: What the Complaint Actually Says

The following are verbatim extracts from the filed complaint, Case No. 3:25-cv-02351, U.S. District Court, Northern District of California. Each quote is followed by a breakdown of what it proves.

“Defendant willfully and knowingly omitted material information regarding the quality and safety of the Products as discussed herein. Defendant countenanced these material omissions to boost or maintain sales of the Product, and to create a false assurance that prolonged loyalty to Defendant’s brand — the continued use of the Product — would not place consumers in danger.”

• This is the central fraud allegation. The complaint does not characterize the concealment as mere negligence or oversight. It uses the words “willfully and knowingly.” This means the lawsuit asserts that Charmast made a deliberate choice.
• The phrase “to boost or maintain sales” identifies the motive: revenue. Charmast allegedly kept quiet about the hazard because disclosure would have cost them customers.
• The phrase “false assurance that prolonged loyalty to Defendant’s brand would not place consumers in danger” means Charmast allegedly used its marketing to build trust it knew was unearned, trapping repeat customers in a cycle of buying a dangerous product.

“Defendant, as the owner, manufacturer, marketer, and seller of the Products, had a duty to disclose because of Defendant’s exclusive and/or superior knowledge concerning the Products… because the facts would be material to consumers; because the Defendant actively concealed or understated them; because the Defendant intended for consumers to rely on the omissions in question.”

• The phrase “exclusive and/or superior knowledge” is legally significant. It means Charmast possessed information about the defect that consumers had no independent means of obtaining. The asymmetry of information was total.
• “Actively concealed or understated” distinguishes this from failing to mention a risk. The complaint alleges affirmative steps to keep consumers from learning the truth.
• “Intended for consumers to rely on the omissions” alleges that the silence was strategic, not accidental. Charmast allegedly knew buyers would assume safety from the absence of any warning.

“Defendant engaged in fraudulent and deceptive conduct by devising and executing a scheme to deceptively convey that their products were safe. Defendant’s actions were done to gain a commercial advantage over competitors, and to drive consumers, like the Plaintiff and Class Members, away from purchasing a competitor’s product.”

• The word “scheme” is precise and deliberate in legal filings. It implies coordination and planning, not a single failure of process.
• “Gain a commercial advantage over competitors” directly connects the concealment to market competition. Safer competitors who warned consumers honestly were undercut by Charmast’s willingness to hide its product’s danger.
• This allegation, if proven, means that Charmast’s deception did not just harm its own customers — it also distorted the competitive market for portable chargers by allowing a dangerous product to compete on false terms.

“Defendant knew or should have known of the defect but failed to warn Plaintiff and Members of the Classes… Plaintiff had no way of knowing of the Product’s latent defect.”

• “Knew or should have known” is the negligence standard. Even if Charmast disputes actual knowledge, the complaint argues the defect was discoverable through reasonable testing and oversight.
• “Latent defect” is a legal term for a defect that is not apparent on inspection and cannot be discovered by a buyer through reasonable examination. Consumers were structurally incapable of protecting themselves.

“Defendant failed to provide adequate warnings regarding the risks of the Product after knowledge of the Defect was known only to them. Despite their knowledge of the Defect and obligation to unilaterally strengthen the warnings, Defendant instead chose to actively conceal this knowledge from the public.”

• “Obligation to unilaterally strengthen the warnings” refers to a manufacturer’s legal duty to update safety warnings proactively, without waiting for a lawsuit or regulator to force action. Charmast allegedly had this duty and ignored it.
• “Chose to actively conceal this knowledge from the public” is among the most direct allegations in the entire complaint. It frames the conduct as a choice, not an omission.

Societal Impact Mapping: Who Gets Hurt When a Charger Catches Fire

Public Health

The W1056 defect produces a burn and fire hazard in an object people routinely place near sleeping family members, in confined spaces, and directly adjacent to their bodies. The documented harms and risks are as follows:

• The CPSC recall explicitly identifies fire and burn hazards. Burns from lithium-ion battery fires range from minor skin injuries to severe, disfiguring third-degree burns, depending on proximity at the time of ignition. The complaint requests “medical monitoring expenses” as part of its damages, signaling that ongoing health surveillance may be necessary for affected consumers.
• Lithium-ion battery fires produce toxic gases including hydrogen fluoride, carbon monoxide, and other combustion byproducts. Exposure in an enclosed environment such as a bedroom or vehicle can cause respiratory injury beyond the immediate burn risk.
• The defect was “undiscoverable” at time of purchase. This means that every person who bought the W1056 and has not yet experienced an incident has no way to know whether their specific unit is about to fail. The health hazard is ongoing, not historical.
• The class covers buyers from December 2018 through September 2024, a period spanning nearly six years. Anyone who purchased the product during that window and still possesses it may still be at risk. The recall, while issued, does not guarantee that all units have been removed from circulation.
• Power banks are commonly used in close physical proximity to sleeping individuals, children, and infants. A fire event during sleep hours, when the product might be unattended on a nightstand or charging inside a bedroom, represents a worst-case scenario public health risk.

Economic Inequality

The financial injury from the W1056 defect falls hardest on buyers who could least afford to absorb the loss. The complaint’s economic allegations reveal a structural pattern of harm.

• The product was sold exclusively through Amazon.com. Amazon’s customer base skews toward cost-conscious online shoppers, many of whom chose Charmast precisely because it offered a lower-cost alternative to premium power bank brands. The complaint’s allegation that “no reasonable consumer would have purchased the product had they known” applies equally to budget-driven buyers who had fewer alternatives.
• The complaint alleges consumers paid for a product that delivered zero safe value: “adulterated, defective, worthless.” Working-class and lower-income buyers who purchased the W1056 as a practical tool for staying connected did not receive the product they paid for. They received a liability.
• The aggregate damages in controversy exceed $5 million across a class numbering “at least in the thousands.” Individual recovery amounts may be relatively small per person, which means that without the class action mechanism, these consumers would have no practical recourse. The cost of individual litigation would exceed any individual recovery.
• The complaint demands “medical monitoring expenses” as a separate category of damages. For uninsured or underinsured class members, any medical costs arising from a battery fire or burn incident would compound economic harm well beyond the purchase price of the power bank.
• The complaint also identifies that Charmast’s concealment “drove consumers away from purchasing a competitor’s product.” This means buyers who would have chosen a safer, non-defective power bank were steered toward the defective one by Charmast’s deceptive safety claims. They did not get to benefit from the competitive market they thought they were shopping in.

The Cost of a Life Metric

How It Was Supposed to Work: The Process Charmast Bypassed

Federal and California law imposed clear obligations on Charmast as a manufacturer and seller of consumer goods. The complaint maps out exactly where those obligations were ignored.

• The complaint asserts ten counts of federal and state legal violations, including California’s Unfair Competition Law (Business and Professions Code § 17000), which prohibits “any unlawful, unfair, or fraudulent business practice” and “deceptive, unfair, misleading or untrue advertising.”
• The UCL claim is significant because it allows for injunctive relief — a court order barring Charmast from continuing to “deceptively market, promote, and describe” the recalled power banks. Even post-recall, the lawsuit seeks to shut down any continued misleading conduct.
• The complaint also notes that “no adequate remedy at law” exists for the UCL violation, meaning standard monetary damages are insufficient and equity-based relief from the court is necessary to make victims whole.

What Now? Here Is What You Can Actually Do

This case is in its earliest stages. The class action was filed March 7, 2025, and no judgment has been entered. But the recall is real, the lawsuit is live, and your options are concrete.

Key Parties in This Case

• Defendant: Shenzhen Charmast Technology Co., Ltd. The foreign corporation whose registered agent is in Colorado. This is the entity sued for every count in the complaint.
• Lead Plaintiff’s Counsel: John C. Bohren, Yanni Law APC, Los Angeles, CA. Contact: yanni@bohrenlaw.com, (619) 433-2803.
• Co-Counsel: Paul J. Doolittle and Seth C. Little, Poulin Willey Anastopoulo, LLC, Charleston, SC. Contact: paul.doolittle@poulinwilley.com, (803) 222-2222.

Watchlist: Regulatory Bodies With Jurisdiction

• U.S. Consumer Product Safety Commission (CPSC): Already issued the W1056 recall. The CPSC’s recall reporting page (SaferProducts.gov) allows consumers to file incident reports if they experienced fires, burns, or overheating from recalled products. Every report strengthens the documented record.
• Federal Trade Commission (FTC): Has jurisdiction over deceptive advertising and unfair trade practices affecting consumers. The allegations in this complaint of willful safety misrepresentation fall within the FTC’s enforcement mandate.
• California Attorney General / UCL Enforcement: The lawsuit invokes California’s Unfair Competition Law. The California AG’s office accepts consumer complaints about deceptive business practices and can pursue enforcement independent of the civil lawsuit.
• Amazon Seller Accountability: The W1056 was sold exclusively through Amazon.com. Amazon’s A-to-Z Guarantee and seller accountability reports provide a channel for documenting harm caused by third-party marketplace sellers. Filing through both Amazon’s system and the CPSC creates a parallel paper trail.

If You Bought a Charmast W1056

• Stop using the product immediately if you still have one. The CPSC recall covers all W1056 units in black, blue, green, mint, pink, and white sold between December 2018 and September 2024.
• Check your Amazon order history. If you purchased a Charmast W1056 during the class period, you are a potential class member. Document the purchase date, price paid, and any incidents you experienced.
• Contact class counsel at Yanni Law APC or Poulin Willey Anastopoulo to understand your options. The class has not yet been certified; joining early allows you to receive notice of all case developments.
• File a report with the CPSC at SaferProducts.gov. If your unit overheated, melted, or caught fire, a formal incident report creates an official record that can be used as evidence in the litigation and in future regulatory action.
• Share this information with anyone you know who regularly uses Charmast products, particularly the W1056. The defect is latent. They may not know their unit is at risk.
• Mutual aid note: if someone in your community experienced a fire or burn injury from this product but lacks resources to pursue individual legal action, connecting them with class counsel costs nothing. The class mechanism exists specifically so that financial barriers do not determine who gets justice.