April 4, 2026
You’re probably here for one of three reasons. You just bought an iPhone 17 and realised again that there’s no charger in the box. Your old charger finally gave out. Or your phone has started charging slowly, intermittently, or not at all, and you’re trying to work out whether the fix is a new charger or something more serious.
Whichever it is, the answer is simpler than the product pages make it look. The bad news is most “iPhone charger” guides online were either written before half the current lineup existed or are trying to sell you a $79 brick you don’t need.
This guide is built on Apple’s current published specs and the kinds of charging issues we see at Swift Tech Buy across our Chicago and Milwaukee stores. We’ll tell you what wattage your specific iPhone actually pulls, what’s worth spending on, and just as importantly when buying a new charger won’t solve your problem.
Most charger advice skips this and goes straight to product picks. That’s how people end up with the wrong wattage, the wrong port, or a charger that works but never hits the speeds they paid for. Two minutes here saves you a return.
1. Your iPhone’s port type.
iPhone 15, 16, 17, 17 Pro, 17 Pro Max, 17 Air, and 17e all use USB-C. iPhone 14 and earlier use Lightning. If you’re buying for an iPhone 14 or older, you need a USB-C-to-Lightning cable, not USB-C-to-USB-C.
2. The maximum wattage your model can actually use.
Higher-wattage chargers won’t damage your phone, the iPhone negotiates power automatically, but you also won’t see speeds above what your model supports. Buying a 100W brick for a phone that caps at 27W is wasted money. The table below has the numbers.
3. Whether wireless matters to you.
All iPhone 12 and later support MagSafe. iPhone 17 and 17 Pro models also support Qi2 at up to 25W, the new standard that finally makes wireless competitive with wired for daily use. If you’ve never bothered with wireless, you can skip it without missing much. If you live near your nightstand, it changes the experience.
This is the single piece of information missing from most guides. Use a USB-C Power Delivery (PD) adapter at or above the wattage shown:
| iPhone model | Wired (USB-C PD) | Wireless (MagSafe / Qi2) |
|---|---|---|
| iPhone 17 Pro / Pro Max | 40W for fastest charging | 25W (Qi2) |
| iPhone 17 / 17e | 40W for fastest, 20W still fast-charges | 25W (Qi2) |
| iPhone 17 Air | 40W | 20W |
| iPhone 16 / 16 Pro | 20W minimum, 30W ideal | 15-25W |
| iPhone 15 (all) | 20W minimum, 30W ideal | 15W |
| iPhone 12-14 | 20W (USB-C-to-Lightning cable) | 15W |
| iPhone 11 and earlier | 18W is enough; no MagSafe | 7.5W Qi only |
For everyday use on a current iPhone, a 30W or 40W USB-C PD adapter with a USB-C-to-USB-C cable covers every model from iPhone 15 onward, and works with iPads and most MacBook Airs as a bonus. That’s the single best buy if you want one charger for everything.
With a 40W adapter, an iPhone 17 charges to about 50% in 20 minutes. With a 20W adapter, it’s closer to 30 minutes. Both qualify as fast charging in Apple’s definition; the 40W just gets you there sooner.
Beyond wattage, four things separate a good charger from one you’ll regret:
Look for MFi (Made for iPhone) for any cable touching a Lightning port, USB-IF certification for USB-C cables, and Qi2-certified for wireless pads. These aren’t marketing badges, they mean the charger has passed independent safety testing. Uncertified chargers are the most common cause of damaged charging circuits we see come through the shop.
Chargers labeled “GaN” (gallium nitride) are smaller, run cooler, and pack more power into less plastic than older silicon designs. A 65W GaN charger is roughly the size of an old 20W brick. Worth the small price premium if portability matters.
The current USB-C fast-charging standards. Either works fine for iPhone; PD 3.1 future-proofs you for higher-wattage devices later.
Cheap USB-C cables fail at the connector before the head ever does. Braided cables with reinforced strain relief at the plug add a year or two of life for a few extra dollars. The cable, not the brick, is usually what wears out first.
Before you buy a new charger, run these checks. Often, what looks like a dead charger is actually something else.
This is the part most charger guides skip, because they’re trying to sell you a charger. If any of the following apply, a new charger is not your fix.
If you’re not sure which of these applies to you, that’s exactly what a free diagnostic is for.
A 40W USB-C PD adapter hits Apple’s rated fast-charge speeds — about 50% in 20 minutes. A 20W or 30W adapter still fast-charges, just a few minutes slower. Anything above 40W is fine but won’t charge any faster.
es. The iPhone only draws what it needs (max around 40W on iPhone 17 Pro), so a 65W or 96W MacBook brick is safe and convenient. This is the upside of USB-C — one charger for both devices.
Close but not identical. Qi2 is the open industry standard that uses the same magnetic alignment MagSafe pioneered, and on iPhone 17 it delivers the same 25W as Apple’s own MagSafe charger. A Qi2-certified third-party pad now works at full speed; older non-Qi2 wireless pads max out at 7.5-15W.
Yes, if they’re certified. Look for MFi (for Lightning), USB-IF (for USB-C), and Qi2 (for wireless). Uncertified bargain chargers from unfamiliar brands are where damage happens, both to the charger and the phone.
Most common culprits, in order: a worn or uncertified cable, debris in the charging port, battery health below 80%, the phone is too hot, or a low-power adapter sneaking in (some “fast” chargers are only 12W). Swap the cable first; it’s the cheapest test.
No. Reputable third-party brands with proper certifications match Apple’s performance for less money. The certification matters far more than the logo on the brick.
Not under normal use. Modern iPhones limit charging speed automatically as the battery fills past 80% and when temperatures rise. Heat does more long-term damage than speed, so the bigger habit to fix is charging in a hot car or under a pillow.
Yes, but slowly, typically 7.5W instead of the 25W Qi2 ceiling. If you use wireless every day, upgrading to a Qi2-certified pad is worth it. If it’s an occasional bedside top-off, your old pad is fine.
For most people on a current iPhone, a single 30W or 40W USB-C PD adapter with a certified braided cable does everything you need, fast charging at home, compatibility with iPad and laptop, and a setup that won’t be obsolete for years. Add a Qi2 wireless pad if it fits your habits. Skip everything else.
If your phone is still misbehaving after the right charger and the basic checks, the problem isn’t the charger, it’s the port, the battery, or the board. Swift Tech Buy diagnoses for free at our Chicago and Milwaukee stores; bring it in before you spend money on a new phone. A well-cared-for iPhone, with the right charging habits and a port repair when it needs one, will easily last six to eight years.
We accept phones that are re-financed or not paid off as long as they are not blacklisted.
Sell My Device
We accept devices in a variety of conditions, including damaged or even broken devices.
Sell My Device
5855 W Silver Spring Dr. Milwaukee WI 53218
(414)236-2867
(414)236-2867
Business Hours
Monday to Sunday - 9am to 9pm
North Oak Shopping Center 6810 W. North Ave Chicago, IL 60707
(773)413-7087
(414)236-2867
Business Hours
Monday to Friday - 10 A.M. to 7 P.M.
Saturday to Sunday - 10 A.M. to 6 P.M.
info@swifttechbuy.com
Copyright © 2026 Swift Tech Buy. All rights reserved.
(877) 835-1941 
info@swifttechbuy.com 
Login 
Track Order