A USB charger has become an almost invisible part of the home: beside the bed, on the kitchen counter, at a desk and in a travel bag. That makes it easy to treat it as little more than a connector or a wattage figure. A mains adapter, however, converts 230-volt alternating current into low voltage for a phone, tablet or laptop; internal insulation and separation from touchable parts are safety-critical.
On 4 November 2026, Hungary’s National Trade and Consumer Protection Authority (NKFH) published results from a targeted nationwide inspection. Of 186 USB chargers tested in its laboratory, 156 failed to meet the relevant standard, a non-compliance rate of 83.87%. Samples came from electronics stores, specialist retailers, small shops operated by Far Eastern businesses and online shops.
This figure must not be read as meaning that 83.87% of every charger on the Hungarian market is dangerous: it was a targeted market-surveillance sample, not a representative consumer ranking. The warning is still serious because the authority examined internal insulation and construction faults that may not be visible to the eye. A careful buying routine cannot replace a laboratory, but it can help avoid products that are visibly poor, untraceable or used incorrectly.
1. Do not start with the cheapest anonymous adapter
Choose a traceable retailer with a name, address and customer service, and obtain a receipt or invoice. For online purchases, save the product page, order confirmation and exact model number. If a recall or complaint arises later, “white USB charger” will not identify the product.
NKFH specifically recommends specialist or electronics stores and cautions against suspiciously cheap products of unknown origin. A higher price alone is not proof of safety; a traceable economic operator and documented product are meaningful safeguards.
2. Find the manufacturer, model and electrical ratings
The charger or its durable label should identify the manufacturer or responsible economic operator, model, input and output voltage/current or power. On multi-port adapters, check whether the headline wattage applies to one port or is shared across all outputs.
Faint, blurred or contradictory text does not prove danger, but it is a warning sign. Do not use an adapter whose basic details have rubbed away, cannot be read, or do not match the packaging.
3. Understand what CE marking means
Some electrical and electronic products must bear CE marking. CE is not an independent quality award and does not mean a central EU laboratory tested every unit. By applying it, the manufacturer declares conformity with applicable EU requirements and must hold supporting technical documentation.
Check that the marking is visible and legible, but do not stop there. The responsible operator, model, user information and electrical ratings provide a more useful picture together. A CE logo cannot override a cracked case, loose plug or abnormal heat.
4. USB-C compatibility is not the same as safety
EU common-charger requirements have applied to many portable devices since 28 December 2024 and to laptops since 28 April 2026. They require USB-C connectivity and compatible charging information. This improves interoperability and can reduce unnecessary adapters.
The shape of the connector is not a safety certificate. Two USB-C adapters can have different internal construction, maximum output and charging protocols. Match the voltage, power and protocol required by the phone, tablet or laptop using the device maker’s documentation.
5. Rate the cable as well as the charger
The charger, cable and device form one system. Not every USB-C cable is suitable for the same load as a high-power laptop adapter. An underrated, damaged or unknown cable can cause slow charging, interruptions or heating.
Inspect connector fit, the cable jacket and strain relief. Replace a cable if insulation is frayed, conductors are exposed, the connector is loose or there is discoloration. Do not automatically blame the charger for a fault caused by the cable or device port.
6. Do not build an uncertain travel-adapter chain
NKFH also examined units combined with travel adapters. A travel adapter does not necessarily convert voltage; many only change the plug shape. Check its rated voltage, current, earthing and mechanical fit.
Do not daisy-chain several converters, power strips and extension leads merely to reach a socket. If the assembly hangs, moves or leaves the plug pins partly exposed, do not use it.
7. Abnormal heat means stop immediately
A charger can become warm in use, but extreme heat, a burnt smell, crackling, repeated cut-outs, discoloration or deformation are not normal. Unplug it, let it cool on a non-combustible surface and do not keep “testing” it.
Do not use a charger with a cracked case, loose contacts or water exposure. Opening a mains adapter at home is particularly dangerous: internal components may retain charge after it is unplugged.
8. Give it air and keep it traceable
Do not cover an operating charger with fabric, trap it between a mattress and wall, or leave it beside a heat source. Use a solid, dry, ventilated surface. Unless the manufacturer says otherwise, disconnect the device when charging is complete and do not leave a rarely used adapter permanently in the socket.
Periodically search the model and batch identification on the retailer’s and manufacturer’s sites, NKFH’s dangerous-products database and the EU Safety Gate. Follow recall instructions; do not pass on the product or place electrical equipment in ordinary household waste.
One-minute checklist
- Is the retailer identified and reachable?
- Have I saved the receipt, model and order details?
- Are the maker, input, output and power legible?
- Are the other required details present alongside CE marking?
- Do the charger’s power and protocol match the device?
- Is the cable undamaged and rated for the load?
- Is the plug stable, with no cracks, discoloration or burnt smell?
- Is charging taking place on a dry, ventilated, non-combustible surface?
The crucial limit is that a consumer cannot measure internal insulation distances at home. A sound choice therefore comes not from a superficial “premium” feel, but from traceable purchasing, compatibility checks and taking abnormal behaviour seriously at once.
Sources and further reading
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