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The short answer
Charging power and data speed are independent. Most cheap USB-C cables carry 60W and USB 2.0 data, which is fine for a phone and useless for a drive or a monitor. Buy 100W or 240W for laptops, and check the data rating separately if the cable will carry anything other than power.
USB-C is a connector, not a capability. Two cables that look identical can differ by a factor of forty in data speed and by a factor of four in charging power. Because nothing is printed on most cables, people accumulate a drawer of them and then cannot work out why the monitor does not work on one and does on another.
The two specifications
Power
- 60W is the default for a cable with no electronic marker chip. Enough for phones, tablets and small laptops.
- 100W requires an e-marker chip and covers most laptops.
- 240W is the current maximum and covers large and gaming laptops.
A cable rated below what the charger and device negotiate simply charges more slowly; it does not become unsafe with reputable cables, because the negotiation takes the cable’s rating into account.
Data
- USB 2.0 at 480Mbps is what most charging cables carry, including many expensive ones. Fine for syncing a phone, painful for an external drive.
- USB 3.2 Gen 1 at 5Gbps and Gen 2 at 10Gbps cover external SSDs comfortably.
- USB4 and Thunderbolt at 40Gbps cover docks, multiple displays and fast storage.
Crucially, a 240W charging cable is very often a USB 2.0 data cable. The high wattage tells you nothing at all about data.
If a cable will carry video to a monitor, it must support the data speed the video needs, not just power. This is the single most common reason a USB-C monitor works with one cable and not another, and why the cable supplied with the monitor is usually the one to use.
Cables worth considering
Anker USB-C to USB-C cable, 60W, two pack, 6ft
The right cable for the majority of everyday charging, and priced so that having several around the house is reasonable. Sixty watts covers phones, tablets and small laptops. Do not expect useful data speed from this class of cable; it is a charging cable.
Anker USB-C to USB-C cable, 100W, 10ft
Length is what people actually want and rarely buy, ending up with a phone tethered to a socket. Ten feet with 100W support covers a laptop at a dining table from a wall socket across the room. Longer cables do have slightly higher resistance, which is accounted for in the rating.
LISEN 240W USB-C to USB-C fast charging cable, 6.6ft
Buy this class if your laptop’s charger is rated above 100W, which is common for 16-inch and gaming machines. Using a 60W cable on such a laptop means it charges slowly and may drain while in use, which people misdiagnose as a failing battery.
INIU 240W USB-C to USB-C cable, two pack 6.6ft
Having the same capable cable in two places removes the daily annoyance of the right cable being in the wrong room. High-wattage cables are worth standardising on, since they charge everything, while the reverse is not true.
Anker USB-A to USB-C cable, two pack 3ft
Still necessary, because car sockets, hotel sockets and older plugs are overwhelmingly USB-A. Charging is slower over this connection by design, and it remains the practical cable for topping up in a car or from a desktop computer.
What we liked
- One connector type for nearly everything
- 240W cables charge every device you own
- Braided cables survive daily flexing
- Cheap enough to keep several around
What we didn't
- Power and data ratings are independent and rarely printed
- Most charging cables carry only USB 2.0 data
- Monitor and dock problems are often cable problems
- Very cheap cables can be poorly built
Practical advice
Label your cables
A small tag or a dot of paint on the high-wattage and high-speed ones saves endless confusion later, since nothing distinguishes them visually.
Standardise on 100W or 240W for charging
They charge everything, and mixed drawers of unknown cables are where the frustration comes from.
Keep one high-speed data cable
Clearly marked, for drives, docks and monitors. This is the cable people hunt for when something does not work.
Use the cable that came with the device
For monitors and docks especially, the supplied cable is specified for that device’s requirements.
Prefer braided cables for anything that moves
The failure point is where the cable meets the connector, and braiding plus a reinforced strain relief extends life considerably.
Avoid unbranded cables for high power
Reputable brands implement the negotiation correctly. This is one of the few places where brand genuinely correlates with safety.
Discard any cable with a damaged connector, exposed shielding or a section that has become hot in use. A cable carrying 100W or more is handling real current, and a damaged one is a genuine hazard rather than merely unreliable.
Will a 240W cable charge my phone faster?
No. The phone negotiates what it needs, and a higher-rated cable simply has headroom. It will not harm the phone and it will not speed it up beyond its own limit.
Why does my monitor not work on one USB-C cable but works on another?
Because video requires data bandwidth, and most charging cables carry only USB 2.0 data. Use the cable supplied with the monitor or one rated for at least 10Gbps.
What is an e-marker chip?
A small chip in the cable that reports its capabilities to the devices. Cables above 60W require one, which is why high-wattage cables cost more than plain ones.
Does cable length affect charging speed?
Slightly, through resistance, and certified cables account for this within their rating. Very long uncertified cables are where you see real losses.
Can a bad cable damage my device?
A properly made cable cannot, because the negotiation limits power to what the cable reports. Poorly made unbranded cables that misreport their capability are the genuine risk, which is why brand matters here.
How to choose
Buy 100W or 240W for charging and standardise on it, so any cable in the house charges anything. Buy one clearly marked high-speed cable for data, drives and monitors, and keep it separate. Prefer braided construction and a known brand for high power. Then label them, because in six months nothing will tell them apart.
