Watts, mAh, PD, MFi: How to Read Accessory Specs Before You Buy
Quick answer: For chargers, look at USB-C PD and watts. For power banks, mAh tells you capacity but real output is lower, so check the watt rating too. For cables, check the connector and the maximum watts. For Lightning accessories, MFi certification means Apple-approved. Ignore vague claims like “super fast” without a number.
Chargers
- W (watts): power. 20W or more fast-charges an iPhone.
- PD (Power Delivery): the USB-C fast charging standard iPhones use.
- PPS: mainly for Samsung super fast charging; harmless for iPhone.
Browse chargers.
Power banks
- mAh: capacity of the internal cells. Expect roughly 60–70% to reach your phone after conversion losses.
- Wh: what airlines look at; under 100Wh is normally allowed in the cabin.
- Output W: how fast it charges your phone.
See power banks.
Cables
- Connector: USB-C to USB-C, USB-C to Lightning, or USB-A.
- Max watts: 60W is enough for phones and most tablets; 100W or 240W for laptops.
- Data speed: many charging cables transfer data slowly; that only matters for moving files.
See cables.
Cases and protectors
- Exact model: iPhone 16 Pro and 16 Pro Max cases are not interchangeable.
- MagSafe compatible: means a built-in magnetic ring.
- Drop ratings: claims vary by manufacturer and are not standardised, so treat them as a rough guide.
Certifications
MFi applies to Lightning accessories approved by Apple. Qi2 certification applies to magnetic wireless chargers. Basic safety marks show the product has been tested electrically.
FAQ
Why does my 10,000mAh power bank not charge my phone 3 times?
Energy is lost converting the battery voltage and as heat, so usable capacity is lower than the number on the label.
Can a cheap cable damage my phone?
A badly made cable can charge slowly or overheat. Buy from known brands with clear ratings.