Europe is transitioning to USB-C, with the “Common Charger” directive mandating a unified power connector for all new devices with a power draw of up to 240W after 2028. However, even in , USB-C is proving to be a source of frustration for many. Online support forums and e-commerce sites are filled with users lamenting that their small charging bricks aren’t delivering on their promises. The issue isn’t simply the physical connector; it’s the protocol – what’s actually flowing through it.
This article summarizes the main pitfalls to be aware of when selecting a new USB charger. And there are many.
To What End?
Before making a purchase, consider primarily what specific device the power supply will be powering most often. While the official USB-C Power Delivery (PD) standard has finally gained traction in recent years, the transition period has spawned a multitude of proprietary protocols. This means a charger that works flawlessly with one device might struggle or perform sub-optimally with another, even if they both use USB-C.
The core of the problem lies in how power is negotiated between the charger and the device. USB-C PD allows for dynamic power negotiation, meaning the charger and device communicate to determine the optimal voltage, and current. However, many manufacturers have implemented their own fast-charging protocols – like Qualcomm’s Quick Charge, Oppo’s SuperVOOC, or Samsung’s Super Fast Charging – that aren’t fully compatible with USB-C PD. While a USB-C PD charger will often work with devices using these proprietary protocols (typically at a slower charging speed), a charger designed for a specific proprietary protocol may not work at all with a device that doesn’t support it.
This situation is further complicated by the fact that chargers don’t always clearly advertise which protocols they support. A charger might claim to be “USB-C PD compatible,” but that doesn’t necessarily mean it supports the latest PD revisions or the full range of voltages and currents. It’s crucial to check the charger’s specifications carefully to ensure it’s compatible with your devices.
Wattage Matters
USB-C chargers come in various wattages, ensuring compatibility with different devices. A phone might charge perfectly well with a 20W charger, while a laptop could require 65W, 100W, or even 140W for optimal performance. Using a charger with insufficient wattage won’t necessarily damage your device, but it will significantly slow down the charging process. Conversely, using a charger with excessive wattage won’t harm a device that supports USB-C PD, as the device will only draw the power it needs.
However, it’s important to note that wattage isn’t the only factor. Voltage and current also play a crucial role. A charger that delivers 65W at 20V and 3.25A is different from one that delivers 65W at 5V and 13A. The former is better suited for laptops, while the latter is more appropriate for devices that support USB Power Delivery’s Programmable Power Supply (PPS) standard, which allows for finer-grained voltage and current control.
Cables Are Critical
The cable itself is just as important as the charger. A cheap or poorly made USB-C cable can limit the charging speed or even prevent charging altogether. This is because the cable needs to be able to handle the voltage and current demanded by the charger and device. Look for cables that are certified by the USB Implementers Forum (USB-IF) and that support the USB-C PD standard. The cable’s specifications should clearly indicate its maximum power delivery capability.
some cables are designed for charging only and don’t support data transfer. These cables typically have fewer wires and are less expensive, but they won’t be suitable if you need to transfer data between your device and a computer. Ensure the cable you choose supports both charging and data transfer if you need both functionalities.
The EU Directive and Its Implications
The EU’s Common Charger Directive, which became law in and will be fully enforced after , aims to standardize charging connectors for a wide range of electronic devices. The directive mandates that devices with rechargeable batteries charged via cable must use USB-C. However, the directive doesn’t address the issue of charging protocols. It only ensures that devices can be charged with any USB-C charger, but it doesn’t guarantee access to maximum charging power. As Birger Hägg at the Swedish Post and Telecom Authority notes, “you may not have access to the maximum charging power.”
This means that even after the directive is fully implemented, consumers may still encounter compatibility issues and slower charging speeds if they use a charger that doesn’t support the same charging protocol as their device. The directive is a step in the right direction, but it’s not a complete solution to the USB-C charging puzzle.
The situation highlights a broader issue: the fragmentation of the USB-C ecosystem. While USB-C has replaced a multitude of proprietary connectors, it hasn’t yet delivered on the promise of a truly universal charging standard. Consumers are still faced with a complex landscape of chargers, cables, and protocols, making it difficult to choose the right combination for their devices. As the market matures and USB-C PD becomes more widely adopted, hopefully, this complexity will diminish, and the USB-C paradise will finally materialize.
