
CNET tested five book-style foldable phones, and iPhone Duo won the championship with an average score of 91.5, beating Samsung, Google and Motorola.
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CNET conducted actual tests on five popular "big folding" mobile phones in 2026. The test included continuous playback of 3 hours of streaming videos and a 45-minute comprehensive usage test. All mobile phones started from 100% full power, uniformly used the inner screen and connected to Wi-Fi.
Apple iPhone Duo wins the battery life championship of large foldable phones.
Foldable phones have large screens and are more convenient to use, but battery life has always been a concern for consumers. Foreign media CNET recently conducted actual tests on five popular "big folding" mobile phones in 2026. The results found that Apple's iPhone Duo performed the best, successfully beating Samsung, Google and Motorola to win the battery life championship.
Compare 5 book-sized foldable mobile phones
This test covers 5 book-style large folding phones, including Apple iPhone Duo, Samsung Z Fold 8, Z Fold 8 Ultra, Google Pixel 11 Pro Fold, and Motorola Razr Fold.
CNET arranged two tests. The first was a 3-hour continuous streaming video, and the second was a 45-minute comprehensive usage test, including watching videos, browsing social media, playing games, and making video calls. All mobile phones were tested starting from 100% full charge, using the internal screen and connected to Wi-Fi. Finally, they were ranked according to the average remaining power at the end of the two tests.
The most surprising result is that although the Apple iPhone Duo only has a 4,883mAh battery, which is not as capable as some competitors, it still won the first place with an average score of 91.5 points. Among them, after the 45-minute comprehensive test, 99% of the power was still retained, which is equivalent to only consuming 1%; however, after the 3-hour video streaming test, the remaining power was 84%, slightly lower than the 86% of Samsung and Motorola. Since CNET ranks based on the average remaining power of the two tests, iPhone Duo successfully raised the overall score and finally won the championship due to its excellent performance in the comprehensive test.
Tested battery life ranking of 5 book-sized foldable mobile phones. (Photo/CNET)
In addition, Motorola Razr Fold grabbed second place and Samsung Z Fold 8 ranked third; Samsung Z Fold 8 Ultra and Google Pixel 11 Pro Fold tied for fourth place. Overall, there is not much difference in the results of various mobile phones, indicating that the battery life performance of the new generation of large folding mobile phones is quite close.
It is worth mentioning that the iPhone Duo not only won the battery life championship among large foldable phones, but also ranked among the top five in battery life compared with all the phones tested by CNET this year, including general upright phones, showing that the battery life of foldable phones is already capable of competing with traditional flagship phones.
Actual test of battery life of plus size small foldable
In addition to large folding phones, CNET also tested four small flip-top folding phones, including Motorola Razr (2026), Motorola Razr Ultra (2026), Motorola Razr Plus (2026), and Samsung Z Flip8. Motorola Razr (2026) won the championship.
Tested battery life ranking of 4 small foldable mobile phones with flip-top and bottom covers. (Photo/CNET)
CNET analyzed that in the past, foldable mobile phones often had lower battery life than traditional mobile phones because of their larger screens, hinges that took up space in the body, and limited battery capacity and heat dissipation design. However, with the increasing popularity of high-energy-density silicon-carbon batteries and the improvement in processor energy efficiency, most foldable phones, whether large or small, can now handle a full day of daily use.

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