USB-C Chargers Explained: Stop Charging Your Phone at 5W
KifTechShare
USB-C is everywhere now, but the cables and chargers are not all equal. Buy the wrong one and you'll either charge your phone at 5W when it could do 45W, or worse, wonder why your laptop isn't charging at all. Here's what you actually need to know.
The thing most people get wrong: it's the charger AND the cable
Fast charging requires both a charger that supports the right protocol and a cable rated for the wattage. A 65W GaN charger paired with a cheap 5W cable will charge at 5W. The cable is often the bottleneck people overlook.
USB-PD is what you want for most things
USB Power Delivery (USB-PD) is the universal fast-charging standard. It negotiates wattage between the charger and device — your phone asks for what it can handle, the charger delivers it. A 65W USB-PD charger won't overcharge a phone that only accepts 25W. It'll just charge at 25W.
USB-PD covers iPhones (20W), most Android flagships, MacBooks, and modern Windows laptops. If you want one charger for everything, USB-PD is it.
Samsung's Super Fast Charging needs something specific
Samsung Galaxy S21 and later support 25W or 45W Super Fast Charging via USB-PD PPS (Programmable Power Supply). A regular USB-PD charger without PPS support will charge your Galaxy — just not at full speed. If you want the genuine 25W or 45W on a newer Samsung, the charger needs to explicitly support PPS at that wattage. This is listed on the product page.
GaN chargers are worth it
Gallium Nitride technology runs cooler and packs into a significantly smaller body than old silicon-based chargers. A 65W GaN charger is roughly the size of a standard 12W phone charger from five years ago. If you travel or work from different spots, it's worth the small premium. The heat reduction also means longer lifespan.
Cable ratings matter above 60W
Standard USB-C cables handle up to 60W. Above that — for laptops, monitors, or high-capacity power banks — you need a cable with an e-marker chip that communicates its rating to the charger. These are listed as 100W-rated or e-marked cables. Using a non-e-marked cable with a 100W charger on a laptop will limit charging to 60W or less.
South African plugs
All KifTech wall chargers include Type C (small round pin) or Type M (large round pin) SA plugs or universal adapters. Input voltage is 100–240V AC — fully compatible with South Africa's 220–230V grid. No adapters needed.
Wireless charging — worth it?
Convenient, yes. Fast, not particularly. Standard Qi charges an iPhone at 7.5W and most Android phones at 5–10W. MagSafe gets to 15W on iPhone 12 and later with an official MagSafe pad. For overnight or desk charging it's fine. For topping up quickly, a cable is still faster.
Will a high-wattage charger damage my phone?
No. Your phone's battery management system requests only the wattage it can safely accept. A 100W charger powering an 18W phone will charge at 18W.
Why is my new Galaxy charging slowly?
The Galaxy S21 and later need USB-PD PPS support for Super Fast Charging. A standard USB-PD charger without PPS will charge at a lower wattage. Check the charger listing for PPS support.