The Short Explanation
iPhones negotiate power with the charger using USB Power Delivery. Regardless of whether the adapter is rated 20W, 40W, or 60W, the iPhone itself decides how much power to draw — and that ceiling sits around 20-27W on every current model, including the iPhone 17 Pro Max. So a 20W charger and a 40W charger will charge your iPhone at the same speed.
Apple Charger Wattage Comparison
| Charger | iPhone Charging Speed | Extra Use Case |
|---|---|---|
| Apple 20W | Full speed | None needed |
| Apple 40W | Full speed (same as 20W) | Also charges iPad |
| Apple 40W Dynamic (60W Max) | Full speed (same as 20W) | Also charges MacBook Air |
Prices and specs may change — check individual product pages.
So Which Should You Actually Buy?
If you only own an iPhone, the 20W adapter is the most cost-effective choice — you lose nothing in speed. If you also own an iPad or MacBook, the 40W (or 40W Dynamic, 60W Max) lets one charger cover every device, which is more convenient for travel.
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FAQs
Does a 96W or 140W charger charge iPhone faster than 20W?
No. iPhone's power draw is capped well below these wattages, so any PD charger 20W or above charges at the same top speed.
Is Apple's 40W charger worth buying if I only have an iPhone?
Only if you value having one charger for multiple devices — it won't charge your iPhone faster than the 20W.
Do AvaNext chargers come with warranty?
Yes, all AvaNext Apple chargers are genuine and warranty-backed, with nationwide Cash on Delivery.
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