USB Chargers | Stephanis

Q: What is the difference between USB-A, USB-C and USB-C PD chargers?

USB-A is the traditional rectangular port offering up to 18W charging. USB-C is a reversible connector supporting higher power levels, while USB-C Power Delivery (PD) can provide up to 240W and charge smartphones, tablets and laptops.

Q: What is GaN technology and why should I choose a GaN charger?

GaN (Gallium Nitride) technology allows chargers to be smaller, lighter and more efficient than traditional silicon chargers. They generate less heat and can deliver high power output in a compact design.

Q: How many watts do I need to fast charge my smartphone?

Most smartphones require at least 18-25W for fast charging. Modern Android flagship devices often support 25-65W or more, while iPhone 15 models charge optimally with a 20W+ USB-C PD charger.

Q: Is it safe to leave my device charging overnight?

Yes, modern devices and chargers include overcharge protection. However, maintaining a battery at 100% for extended periods may affect long-term battery health. Keeping charge levels between 20% and 80% can help maximise battery lifespan.

Find the Perfect USB Charger for Every Device

Keep all your devices charged at all times. At STEPHANIS you'll find USB chargers for every need - from compact single-port travel chargers to multi-port desktop chargers that simultaneously power mobiles, tablets and laptops. Choose fast charging technology such as USB-C Power Delivery (PD), Qualcomm Quick Charge or GaN technology for a smaller size and maximum performance. Find the ideal charger for you at STEPHANIS.

Shop Our USB Charging Range: Power Banks, USB Cables, Wireless Chargers, Laptop Power Supplies, Travel Adaptors, Lightning Cables, Bluetooth Earbuds, Smartphones, Tablets, Laptops

Frequently Asked Questions

What is the difference between USB-A, USB-C and USB-C PD chargers?

USB-A is the classic rectangular port, offering up to 18W fast charging. USB-C is the newer reversible connector that supports significantly higher power delivery. USB-C PD (Power Delivery) chargers can provide up to 240W, making them suitable for smartphones, tablets, laptops and gaming devices. They are currently the most versatile charging solution available and work particularly well with MacBooks, iPad Pro models, Android flagship devices and the Nintendo Switch.

What is GaN technology and why should I choose a GaN charger?

GaN (Gallium Nitride) is an advanced semiconductor material that allows chargers to be smaller, lighter and more efficient than traditional silicon-based chargers.

More compact design for easier portability.
Higher charging efficiency with less energy loss.
Reduced heat generation during operation.
Capable of delivering high power output from a small charger.

For example, a 65W GaN charger can be as little as one-third the size of a conventional charger while delivering the same performance.

How many watts do I need to fast charge my smartphone?

The ideal charger wattage depends on the device you want to charge:

Smartphones: 18–25W minimum for fast charging.
Premium Android phones: often support 25–65W or higher.
Tablets: typically require 18–30W.
Laptops: generally need 65–100W+ USB-C PD charging.

Choosing a charger that matches your device's supported charging speed ensures optimal performance and charging efficiency.

Is it safe to leave my device charging overnight?

Yes. Modern smartphones, tablets and laptops include built-in battery management systems, while quality chargers feature overcharge protection that stops charging once the battery reaches 100%. However, keeping a battery at 100% for extended periods may gradually reduce long-term battery lifespan. For the best battery health, many experts recommend maintaining charge levels between approximately 20% and 80% whenever practical.