Which Foldables Led the Battery-Life Tests?

CNET reported different battery-test leaders for the two foldable designs: the iPhone Duo led its tested book-style phones on average, while the Motorola Razr led the flip-phone group. The results belong to CNET’s specific tests. A separate XEETECHCARE comparison measured how long three Samsung phones lasted under a different workload.

Battery results make sense when you keep the workload and measurement together.

Which foldables led CNET’s tests?

CNET reported that the iPhone Duo had the highest average result among its five tested book-style foldables. It retained 99% charge after a 45-minute mixed-use test and 84% after three hours of video streaming. The Motorola Razr led CNET’s flip-phone group on average and in streaming, and tied the Razr Ultra in the mixed-use test.

For the book-style group, CNET also reported that the Motorola Razr Fold, Samsung Galaxy Z Fold 8 and Samsung Galaxy Z Fold 8 Ultra each finished the streaming test with more charge remaining than the iPhone Duo. The Galaxy Z Fold 8 narrowly beat the Z Fold 8 Ultra overall, while the Google Pixel 11 Pro Fold was close behind the group.

What the tests measured

CNET’s 45-minute test combined video, social-media scrolling, a game and a video call. Its other test played streaming video for three hours. Both began with a full charge, used Wi-Fi and ran on the inner screen.

Those results answer different questions: CNET measured charge remaining after fixed-length workloads. XEETECHCARE, in a separate comparison, ran phones until their batteries depleted. A percentage after a set period and a total runtime are different measures.

A separate Galaxy Z Fold runtime test

In a video published July 16, 2025, XEETECHCARE reported these times to battery depletion for the Galaxy Z Fold 6, Galaxy Z Fold 7 and Galaxy S25 Ultra:

In that test, the Fold 7 lasted 29 minutes longer than the Fold 6; the S25 Ultra lasted 1 hour 2 minutes longer than the Fold 7. XEETECHCARE used Wi-Fi with no SIM cards. For social media, the test switched between the cover and main screens every 30 minutes; gaming and media used the main screen.

Why Galaxy Z Fold 8 owners report different results

Individual owners describe different day-to-day outcomes. One says the phone often ends the day with 30–45% charge remaining after setting a 90% charging limit; another reports about six hours of screen time with 20–30% left. Owners also describe different screen-use patterns and settings, so these accounts are personal experiences, not a typical-use estimate (owner discussion, another Fold 8 discussion).