Apple’s First Foldable iPhone May Ship With the Biggest Battery Ever

Key Takeaways:

Foldable iPhone may pack Apple’s biggest battery yet with a 5,400–5,800 mAh capacity under testing, beating the iPhone 17 Pro Max’s 5,088 mAh.
Power efficiency helps keep the design slim as Apple combines larger battery size with smaller internal components and improved power management.
Could outperform rivals like Pixel Fold and Galaxy Z Fold 7 which currently max out at 5,015 mAh and 4,400 mAh battery capacities.
Expected specs include a 7.8-inch inner display, 5.5-inch cover, and side Touch ID with no SIM slot and a four-camera layout.
Don’t expect it before late 2026 and early details may shift, as the final battery size and design hinge on ongoing testing and supplier timelines.

Apple is testing a massive battery for its first foldable iPhone, based on information from the Korean Naver blog account yeux1122. The company is evaluating capacities between 5,400 and 5,800 mAh. If the final model uses the higher capacity, it would be the biggest battery ever on an iPhone. For comparison, the iPhone 17 Pro Max has a 5,088 mAh battery. Reports indicate that Apple is focusing on strong battery life while still pursuing a slim design, helped by more efficient components and better power management.

Bigger Battery Might Beat Current Foldable Competitors

A battery in the rumored range would give Apple an advantage over today’s foldables. The Google Pixel 10 Pro Fold has a 5,015 mAh battery and the Samsung Galaxy Z Fold 7 has a 4,400 mAh battery. A 5,400 to 5,800 mAh battery on a foldable iPhone would likely mean longer usage without increasing the bulk. Earlier leaks from the same Korean source highlighted Apple’s focus on power efficiency by shrinking internal parts. Analyst Ming-Chi Kuo has also mentioned high-density battery cells, which fits the same direction.

Foldable iPhone Expected Hardware and Design

Analysts widely agree on several major specifications for the device:

7.8-inch inner display when unfolded
5.5-inch cover display
Touch ID on the side button rather than Face ID
Four camera setup, including front, inner and two rear lenses
Second-generation C2 cellular modem
No physical SIM card slot

Touch ID instead of Face ID is expected because a Face ID system requires more components and may not fit well inside a folding frame, similar to the approach on the iPad Air and iPad mini.

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Rumors Point to a Fall 2026 Launch

Bloomberg’s Mark Gurman expects the foldable iPhone to launch in Fall 2026 alongside the iPhone 18 Pro models unless supply chain setbacks occur. The battery leak source has been accurate at times and inaccurate at others, so caution is still needed. However, reports from Naver, Ming-Chi Kuo, Jeff Pu and Digital Chat Station all align on display sizes and core features, signaling that the device is moving toward the final stages of development.

A foldable iPhone with a huge battery and strong efficiency could set a new benchmark if these reports are true.