Type-C on both ends looks like a solved standard. It is not. Two cables that look identical can differ by a factor of ten in charging speed and by a factor of forty in data rate. Here is how to tell them apart before you buy.
The three things a cable is rated for
- Power — measured in watts. Common tiers are 60W and 100W (and now 240W).
- Data — USB 2.0 (480Mbps) is the default even on many premium-looking cables. USB 3.2 is 10Gbps.
- Video — whether it carries a display signal at all.
A cable can be excellent at one and useless at another. The Type-C cable that came with your phone almost certainly does 60W power and USB 2.0 data — fine for charging, hopeless for moving a large file or driving a monitor.
Why your fast charger is charging slowly
This is the most common cable problem in Indian homes. A 65W charger with a 20W-rated cable gives you 20W. Nothing on either device tells you this is happening.
For anything above 60W, the cable needs an e-marker chip — a small controller that tells the charger how much the cable can safely handle. Without it, the charger defaults to a safe low figure. Look for the wattage printed on the connector or stated in the listing; an unmarked cable is a 60W cable at best.
Length costs you watts
Resistance rises with length. A 2m cable of the same gauge delivers less than a 1m one, and cheap thin-gauge 2m cables are noticeably worse. For fast charging, 1m to 1.5m is the practical range. Keep the long cable for overnight charging where speed is irrelevant.
Lightning: what changed
Older iPhones use Lightning. A USB-A to Lightning cable caps out around 12W. A USB-C to Lightning cable unlocks Power Delivery fast charging — roughly 50% in 30 minutes on a compatible iPhone. If you have an iPhone 8 or later and are still using the USB-A cable, this single change is the cheapest speed upgrade available.
Salpido's SDC70C USB-C to Lightning covers this; the SDC10i and SDC70i are the USB-A variants for older chargers.
MFi and why it matters on Lightning
Apple's Made for iPhone certification is not marketing. Uncertified Lightning cables trigger the "This accessory may not be supported" warning and often stop working after an iOS update. On Type-C to Type-C this does not apply — there is no equivalent lock.
Braided versus rubber
Braided nylon resists the fraying that kills most cables at the connector neck. It is worth the small premium if the cable lives in a bag. For a cable that stays plugged in beside the bed, it makes no difference.
What matters more than the jacket is strain relief — the moulded section where cable meets connector. A cable with a long, flexible strain relief lasts years longer than one where the jacket meets the plug abruptly.
A quick buying checklist
- Fast charging a phone: 60W Type-C, 1m, braided
- Charging a laptop: 100W Type-C with e-marker
- iPhone (Lightning): USB-C to Lightning, MFi
- Connecting a monitor or transferring large files: check for USB 3.2 and video support explicitly — most cables do not have it
- Car or travel: 1m, braided, with good strain relief
Common questions
Can a bad cable damage my phone? A properly built one cannot. Genuinely defective uncertified cables can, which is the argument for buying from a brand with a warranty.
Why does my cable work for charging but not data? It is almost certainly a charge-only cable, or USB 2.0 where you need USB 3.
Does the same cable work for Android and iPhone 15? Yes — iPhone 15 and later use Type-C.
How long should a cable last? Two to three years of daily use. Failure at the connector neck earlier than that points to strain relief, not luck.
See all USB cables and cables and adapters.