Apple’s next ultra-slim iPhone might not just look different. It could feel completely new in the hand. Thanks to new images from the Korean blog Naver, we’ve had our first clear look at what is said to be the iPhone 17 Air battery. Honestly, it’s hard to believe how thin this device is.
Thinner Than Ever — Just 2.49mm
According to the latest report, the iPhone 17 Air’s battery is only 2.49mm thick, metal casing included. To put that in perspective, that’s about the same as stacking three credit cards. That’s surprisingly thin for a battery that’s expected to power a large-screen iPhone.
Side-by-side comparisons show it’s noticeably thinner than the iPhone 17 Pro’s battery, which is also said to use the same L-shaped design wrapped in a steel shell.

Why the extreme thinness? Well, the iPhone 17 Air is rumored to be Apple’s slimmest phone ever, possibly measuring around 5.5mm thick. That kind of design simply doesn’t leave much room inside for a large battery.
Bigger Screen, Smaller Battery — Smart or Risky?
So, how much battery life can we really expect from something this thin?
If the current info holds, the iPhone 17 Air may come with a 2,900 mAh cell. That’s a big drop compared to the 4,674 mAh battery in the iPhone 16 Plus, which the 17 Air is expected to replace.
Just for comparison, the last iPhone with a battery under 3,000 mAh was the iPhone 13 mini, and that one had a much smaller 5.4-inch screen. The 17 Air? It’s said to be packing a huge 6.9-inch display. So yeah, that’s a lot of screen to keep powered with a pretty modest battery.
Could Apple Use New Battery Tech?
Here’s where things get interesting. Rumors suggest Apple might use silicon-carbon (Si/C) battery tech for this model. That would help boost energy density without needing a physically bigger battery.
It’s not confirmed yet, but if true, it could mean better battery life than the numbers suggest. Still, it’s going to be a challenge. A super thin phone with a huge display and a smaller battery? That’s a tight squeeze in every sense.
Final Thoughts
The iPhone 17 Air is clearly aiming for something bold and extreme thinness that sets it apart from every iPhone before it. But to get there, Apple may be sacrificing battery size, which always raises questions about real-world use.
If Apple can balance that with smarter battery tech or software optimizations, it could work. But for now, the biggest surprise isn’t the design but it’s just how much slimmer the inside has become too.
Also Read | Phone 17 Pro Battery Leaks in New Images
