Samsung Galaxy Z Fold8 vs Galaxy Z Fold8 Ultra battery: Which lasts longer in everyday use?

The Samsung Galaxy Z Fold8 Ultra lasts longer. It packs a 5,000 mAh battery rated for up to 27 hours of video playback, edging out the Galaxy Z Fold8, which features a 4,800 mAh cell and up to 26 hours of playback.

In our experience, you can comfortably rely on both phones to power through a full day. The Galaxy Z Fold8 Ultra just gives you a bit more breathing room on those extra-heavy usage days, while lighter habits can easily stretch either device well into day two.

Both models support snappy 45W^[1] wired charging and 20W^[2] wireless charging.

The numbers at a glance:

Looking at the rated video playback gives us the clearest side-by-side comparison on paper, and the Galaxy Z Fold8 Ultra pulls ahead by an hour.

Our real-world time with both phones tells the same story. Both easily survive a typical day, even with several hours spent running on mobile data. The Galaxy Z Fold8 Ultra simply offers more of a safety net if you spend a ton of time on the massive main display, while light usage can push it well into a second day.

The Galaxy Z Fold8 isn't far behind, though. It can also stretch past the 24-hour mark with lighter use, especially if you primarily use the cover screen rather than unfolding it for the 7.6-inch main display.

Since both battery capacities are right in line with traditional flagship phones of a similar size, you aren't sacrificing battery life just to get the benefits of a folding screen.

Plus, keep in mind that a foldable only powers one of its two screens at a time. The display you use the most will impact your battery life more than the slight capacity difference between the two models.

In practical terms, battery life isn't something you need to plan your whole day around with either the Galaxy Z Fold8 or Galaxy Z Fold8 Ultra.

The short answer? It has a bigger battery. That 5,000 mAh capacity gives it a 200 mAh edge over the Galaxy Z Fold8.

It also rocks a larger main display—8 inches compared to 7.6 inches—so some of that extra juice is naturally dedicated to lighting up the bigger screen. Even so, rated video playback climbs from 26 hours on the Fold8 to 27 hours on the Fold8 Ultra.

That extra headroom shines when you keep the main display open for long stretches. Activities like video calls, heavy streaming, gaming, and photo editing force the larger screen and internal hardware to work overtime.

To handle this, the Galaxy Z Fold8 Ultra features an expanded graphite cooling structure. Good heat management is crucial during intense workloads because keeping the hardware cool helps it run more efficiently. This, in turn, cuts down on unnecessary battery drain during those long gaming or video editing sessions.

Very well. Its 4,800 mAh battery is rated for up to 26 hours of video playback, and in our testing, it comfortably tackled a full day, even with a few hours relying on mobile data.

On quieter days, it goes even further. If you stick mostly to the cover screen and skip the marathon gaming or camera sessions, you can easily ride it into day two.

The shape of that cover screen makes this effortless. Its 5.5-inch, 10:16 aspect ratio feels like a traditional phone, meaning you can reply to texts, clear notifications, switch up your playlist, or look something up without ever needing to unfold the device.

But even when you do frequently use the folding display, the Galaxy Z Fold8 won't leave you worrying about battery life.

Travel is usually the ultimate battery test, combining everything that drains a phone: constant mobile data, GPS navigation, streaming music, a bright screen, and long gaps between outlets.

The Galaxy Z Fold8 handled this gauntlet like a champ in our experience. During one test, we ran navigation on the cover screen for about an hour while simultaneously playing music in split-screen mode. The battery barely broke a sweat, and the phone didn't become noticeably warm.

For those especially long travel days, 45W wired charging is a lifesaver. Just half an hour plugged in can boost the Galaxy Z Fold8 up to 63% and the Galaxy Z Fold8 Ultra up to 67%. A quick stop is all it takes to put a massive amount of power back into the phone.

Both foldables support fast 45W Super Fast Charging 2.0^[6] wired charging.

The Galaxy Z Fold8 Ultra can hit up to 67% in just about 30 minutes, while the Galaxy Z Fold8 reaches up to 63% in that same window.

For the Galaxy Z Fold8 Ultra, this is a massive upgrade over its predecessor over the Galaxy Z Fold7’s 25W charging. As a brand-new addition to the lineup, the Galaxy Z Fold8 gets that same 45W charging support right out of the gate.

During our tests with the Galaxy Z Fold8, that 30-minute estimate held up well. The benefit here is straightforward: even brief charging sessions pump a good amount of life back into the battery.

The Galaxy Z Fold8 Ultra takes things a step further with a dual-path charging architecture. It separates the power running the phone from the power filling the battery, which manages heat and keeps charging efficient if you're using the phone while it's plugged in.

Finally, both models feature 20W wireless charging and Wireless PowerShare.

You'll need a power adapter capable of pushing out 45W. Samsung includes the required cable right in the box, though the power adapter itself is sold separately.

If you use a lower-rated brick, both phones will still charge perfectly fine; they just won't hit those maximum speeds.

Absolutely. Samsung's One UI includes several excellent power saving options tucked into the Battery section of device settings. These tools let you throttle background activity, limit network usage, and tweak other functions when you really need to stretch your final few percentages.

The software even gives you an estimated battery life extension before you hit the toggle, so you know exactly how much extra time you're buying yourself.

One UI’s battery protection settings are designed to keep your phone healthy by minimising the time it spends sitting at a full 100% charge.

The Basic setting stops charging at 100% and only kicks back in once the battery drops to 95%. The Maximum setting lets you cap the charge at a specific limit, preventing it from hitting 100%.

Meanwhile, Sleep time protection holds the battery at a steady 80% overnight, only finishing the charge right before your alarm goes off.

These options give you the flexibility to choose between always having maximum power for the day ahead or maximising the lifespan of the battery itself.

No. The Galaxy Z Fold8 Ultra unfolds to a razor-thin 4.1 mm—shaving 0.1 mm off the Galaxy Z Fold7—yet the battery capacity has actually jumped from 4,400 mAh up to 5,000 mAh.

The all-new Galaxy Z Fold8 also steps up with a 4,800 mAh battery while being the world’s lightest book-style foldable phone with a weight of just 201 g.

Both 2026 models achieve this by utilising advanced silicon-carbon batteries, which squeeze significantly more energy into the tight spaces of these ultra-thin designs.

If raw endurance is your top priority, the Galaxy Z Fold8 Ultra is the clear winner. You get the larger 5,000 mAh capacity, an extra hour of rated video playback, and a slightly faster 30-minute charge rate.

However, since both phones comfortably survived full days during our testing, picking the Galaxy Z Fold8 doesn't mean sacrificing reliable, all-day battery life.

The Galaxy Z Fold8 Ultra is the smarter pick if you know you'll be spending long hours working or gaming on the main display and want that extra safety net. Meanwhile, the Galaxy Z Fold8 delivers nearly identical rated endurance, matching charging speeds, and a wonderfully light 201 g footprint.

Ultimately, the Ultra gives you a bigger battery margin, but the Fold8 stays close enough that battery life alone shouldn't dictate which form factor you take home.

^{[1] 45W charger sold separately.}

^{[2] 20W wireless charger sold separately.}

^{[3] Typical value tested under third party laboratory conditions. Rated minimum capacity of the Galaxy Z Fold8 Ultra is 4,854 mAh.}

^{[4] Typical value tested under third party laboratory conditions. Rated minimum capacity of the Galaxy Z Fold8 is 4,660 mAh.}

^{[5] Wireless PowerShare: Works with most Qi-compatible devices. Different devices may charge at different speeds. Need minimum of 30% to use.}

^{[6] Super Fast Charging (SFC) 2.0 requires a USB Power Delivery (PD) 3.0 compatible device supporting Direct Charging.}