Technologies
I Tested the Galaxy Z Flip 7 and It Impressed Me in Every Way but One
Review: The Galaxy Z Flip 7 is the most fully realized version of Samsung’s ideal flip phone.
Pros
- The 6.9-inch screen is immersive, with lovely colors and contrast
- The 4.1-inch screen looks incredible
- It’s durable and survived a drop onto concrete
- One UI 8 (Android 16) runs wonderfully
- $1,100 is still a lot, but Samsung gives the phone more value than the Flip 6
Cons
- Gets warm when recording videos and playing games
- Battery life is the same as the Flip 6 despite a bigger battery
- Cover screen software has room to grow
When I first got my hands on Samsung’s new Galaxy Z Flip 7, I was delighted to discover that it has a smaller crease, larger cover screen, thinner design and bigger battery compared to last year’s Galaxy Z Flip 6. But as I tested the new clamshell phone, I became enthralled by its inner screen. At 6.9 inches, this is the biggest screen on any Samsung phone aside from the Galaxy Z Fold 7, which has an 8-inch foldable display.
The Z Flip 7’s large screen size makes content feel more immersive and colors look lovely and vivid. This led to epic TikTok and Instagram sessions, watching widescreen films such as A Working Man and Back to the Future, as well as jumping back and forth between two apps stacked vertically on the screen thanks to One UI 8’s 90:10 split tool.
This is not your father’s smartphone or even his old flip phone.
Every time I open the Flip 7, I am consistently dumbfounded by how such a large display can unfurl from something about the size of a makeup compact. And when it’s closed, there’s a 4.1-inch cover screen that’s fantastic in its own ways with new clever animations for when you’re recording a video, charging the phone or taking a selfie, all efficiently using the extra cover display real estate. In terms of functionality, though, the cover screen’s software is about the same as the 3.4-inch one on the Flip 6.
The Galaxy Z Flip 7 is the most fully realized version of Samsung’s ideal of a flip phone since the launch of the original Galaxy Z Flip in 2020. The Flip 7’s appeal is simple: It’s a thin phone with a big, bold screen that folds in half into a coaster-sized square.
The Flip 7 launches at a time when Samsung’s competitors, especially Motorola, have found their own unique appeal and success with flip phones, which have progressed from novelty to competitive cutting-edge technological niche. So it’s a delight to see the South Korean company nail this phone’s design. And in my testing, the Galaxy Z Flip 7 has been a blast to use.
Whether I was on the streets of Little Italy in New York paying for gelato without opening the phone or watching Sinners on that 6.9-inch screen during a flight to San Francisco, the Flip 7 impressed me in nearly every way but one: its battery life. It has a larger battery than the Flip 6, but it doesn’t last any longer in daily use. It did consistently get me through a day on a single charge, often having 15 to 20% left, but there were also a few days where it needed an early evening top-off. That’s OK, but I was hoping to squeeze out a few more hours. Also, the Flip 7 did occasionally get warm easily while in use, especially when I was filming videos, playing games or using it as a desktop computer via DeX (yes, I’m that guy).
The Galaxy Z Flip 7 starts at $1,100 (£1,049, AU$1,799) and comes with 256GB of storage (512GB in Australia). That’s the same price as last year’s Flip 6, but you actually get double the storage. The $1,100 price is still a lot for a phone, but I think Samsung added more value to the Flip 7 than it did with the Flip 6, and there’s always the lower-spec (and less refined) Galaxy Flip 7 FE at $900 for those who want to save a little money. The Flip 7 FE is essentially a repackaged Flip 6 without its Snapdragon processor. But to help make the cost sting less, Samsung and carriers have deals for the Flip 7.
Who should buy the Galaxy Z Flip 7?
If you’ve been tempted by a clamshell-style foldable, you should definitely consider the Flip 7. If you’re trying to choose between the Flip 7 and the comparable $1,300 Motorola Razr Ultra, that’s a tough choice. I’m working on a comparison between the two flip phones but I will say this for now: I’m a huge fan of the Razr Ultra, and while on paper it costs $200 more than 256GB Flip 7, Motorola’s premium clamshell foldable comes with 512GB of storage. A Flip 7 with 512GB costs $1,220, which is still $80 of daylight between the two.
If you have a Galaxy Z Flip 4 or older, the Flip 7 will be an upgrade in every way. It’s harder to make that same recommendation for Flip 5 owners unless your phone is showing its age. And if you have a Galaxy Z Flip 6, you can sit this one out unless you really want those larger screens.
Galaxy Z Flip 7 design
The entire Flip 7 is thinner than the Flip 6, including the hinge, which is nearly 30% smaller. The difference is noticeable when I hold it. The phone might not be as dramatically thin as the Fold 7, which is over two millimeters thinner, though I keep wondering how amazing a clamshell-style foldable would be if it were the same thickness as the Fold 7. The hinge can easily be positioned at nearly any angle between its open and close points. And closing the Flip 7 comes with a solid thwap sound that is as satisfying as rubbing a dog’s belly.
Foldable phone thickness compared
| Phone | Open | Closed |
|---|---|---|
| Samsung Galaxy Z Fold 7 | 4.2mm | 8.9mm |
| Samsung Galaxy Z Flip 7 | 6.5mm | 13.7mm |
| Samsung Galaxy Z Flip 7 FE | 6.9mm | 14.9mm |
| Motorola Razr Plus (2025) | 7.09mm | 15.32mm |
| Motorola Razr Ultra | 7.19mm | 15.69mm |
Despite the thinner design, the Flip 7 is actually a gram heavier than the Flip 6. In hand the phone feels light and is comfortable to hold. It has an IP48 rating for water and dust resistance which is the highest a foldable phone can have as of 2025. The number «4» in the rating means it is protected against particles that are 1-millimeter or larger. So the Flip 7, as with most foldables, isn’t something you should bring to the beach. If sand got into the hinge or screen it could do costly damage, for example.
In terms of durability, I didn’t expect to test this on my first day with the Flip 7, but I accidentally dropped it on a concrete patio. Aside from a tiny scratch on the hinge, the Flip 7 came out unscathed.
While the crease on the inner screen is less noticeable, I can still see it at certain angles and feel it when swiping. There are some picky purists waiting for a truly seamless folding screen who will be unsatisfied, but I truly don’t see it most of the time when the screen is on.
On previous Z Flip phones, going back and forth between the inner screen and the outer display showed off their differences, with the cover screen looking noticeably dimmer especially in sunlight. Thankfully Samsung fixed that. The cover screen and main display can each reach up to 2,600 nits of peak brightness and both have up to a 120Hz refresh rate to make system animations, scrolling around and video game graphics look buttery smooth and immersive. It’s a significant improvement.
Galaxy Z Flip 7 battery and processor
Samsung took a different approach with the Flip 7’s processor by opting for an Exynos 2500 chip, instead of the Snapdragon 8 Elite that is in foldables like the Razr Ultra and Fold 7. While it’s a notable change, the Exynos 2500 runs just fine in daily use. The only times I suspected something might be different was when the Flip 7 would get warm — but that might have more to do with the new thinner design.
In benchmarks for the CPU, the Flip 7 scored lower in the Geekbench 6 test than the Razr Ultra and Fold 7 and nearly the same as the Flip 6, which runs on a Snapdragon 8 Gen 3 chip. And for gaming and graphics benchmarks, the Flip 7 was well behind the Fold 7, the Razr Ultra and the Flip 6 in the 3D Mark Wildlife Extreme test.
These tests should be taken with a grain of salt, though. The Flip 7 will be just fine for most people in daily use. If you’re heavily into mobile gaming, using on-device AI or want the Flip 7 to be your full-time videographer, you might want to look at the Razr Ultra or the Fold 7. But for less frequent AI use, video recording and gaming, you should be fine with the Flip 7’s hardware. I’m curious about the longevity of the Exynos 2500 chip, especially if someone were to keep the Flip 7 for the seven years that Samsung promises of software and security updates.
Geekbench v.6.0
- Geekbench v.6.0 single-core
- Geekbench v.6.0 multicore
3DMark Wild Life Extreme
The Flip 7 has a 4,300 mAh battery; that’s up from the 4,000 mAh one in the Flip 6. But the Flip 7 has two larger screens and a cover screen that can hit a higher maximum peak brightness. So that extra bit of battery capacity gets gobbled up pretty quick. In real life, I averaged a full day of use on a single charge over two weeks. A couple more hours of use would be better, as it would definitely help with Flip 7’s longevity, especially as newer software could potentially drain the battery faster in the future.
In CNET’s 45-minute battery endurance test, which includes scrolling through social media and news feeds, streaming YouTube, conducting a video call, playing games and other general-purpose use, the Flip 7 lost less of its charge than the Flip 6, but dropped more than the Razr Ultra. And in CNET’s video battery test, which entails streaming video on the main display at full brightness for three hours, the Flip 7 lost less of its charge than the Flip 6 but more than the Razr Ultra, which has a maximum 165Hz refresh rate.
Galaxy Z Flip 7 One UI 8
Notably, the Flip 7 and Fold 7 run One UI 8 (Samsung’s customized version of Android 16) out of the box. Android 16 was released a month ago, so it’s incredible that Google and Samsung were able to actually do this — which brings Flip 7 owners the newest software bells and whistles.
In use, One UI 8 has been wonderful. I haven’t experienced any hiccups or bugs. I really enjoy having the 90:10 split interface on the main screen where one app takes up 90% of the display and another takes up 10%. And if I want to switch it up so that the app taking up 10% takes up 90%, I simply tap on that app’s window. It’s a small but delightful tool great for multitasking.
Samsung’s Now Brief UI feature plays a bigger role on the cover screen. There’s a tiny stack to the left of the cameras where I can shuffle through notifications like a deck of cards. In terms of Now Brief, the briefings are still rather sparse. I see the weather, a random news story and a prompt to add YouTube videos to my brief. I think Now Brief has potential, but as it is, I can’t say I’d use it.
Cover screen widgets are great and interactive. You can run full apps (via Samsung’s Good Lock app), but they aren’t as well-optimized for the screen as apps running on the Motorola Razr Ultra’s cover display. I’m happy to see Samsung expand the cover display’s size but wish the software matched the experience of the main screen better. I still encounter the «open phone to continue» pop-up more than I like.
There’s a new button on the cover screen for changing an app’s aspect ratio. It’s a killer feature given that apps running through the Good Lock app aren’t always optimized for the cover display’s square-ish aspect ratio.
Galaxy Z Flip 7 camera
There are two cameras on the outside of the Flip 7: a 50-megapixel wide-angle and a 12-megapixel ultrawide. Cut into the inside screen is a 10-megapixel selfie camera. But if you haven’t used a modern flip phone before, know that you’ll be using that 50-megapixel main camera the most, even for selfies and group shots.
Like prior Z Flip models, the Flip 7 is one of the most versatile phones for capturing images and that’s largely because the foldable is its own tripod by unfolding it halfway. And while the cameras are not the best ones you can find on a phone or foldable, they consistently take good photos and videos.
Do I wish there was a dedicated telephoto camera? Yes, but cropping in or taking photos at 2x or even 4x looks good. And the Flip 7 gets the new zoom slider that the Galaxy S25 series has, which is handier for pinpoint adjustments than other phones’ camera apps. It makes such a difference when I’m holding the phone one-handed and trying to zoom in on a subject.
I have been a fan of Samsung’s ultrawide cameras for years — there’s just something magical with that lens specifically that can make a photo look dramatic without going completely distorted like a fisheye lens. Do I wish it took better photos under dim lighting like in a bar? Yes.
To improve the shooting experience, Samsung has added support for log video recording, which preserves more image information in the highlights and shadows, allowing for greater flexibility when it comes to editing a video’s colors and contrast. There’s also Audio Mix, which can make the audio in your videos sound better with the help of AI.
Galaxy Z Flip 7 final thoughts
It feels like Samsung took nearly every shortcoming that previous Z Flips had and solved them for the Flip 7. The phone is filled with smart compromises and will no doubt have a wider appeal as a result. And if you’re able to get to a store and see the Flip 7 in person, you’ll know immediately whether it’s for you or not. But the Flip 7 isn’t the only clamshell foldable that Samsung launched. There’s also the $900 Galaxy Z Flip 7 FE, which is basically a repacked Flip 6 with a new processor. Previously, Samsung would keep last year’s Flip around with a $100 discount. We’re testing the Flip 7 FE, so keep an eye out for CNET’s review.
Samsung Galaxy Z Flip 7 specs versus Galaxy Z Flip 7 FE, Motorola Razr Ultra, Galaxy Z Flip 6
| Samsung Galaxy Z Flip 7 | Samsung Galaxy Z Flip 7 FE | Motorola Razr Ultra (2025) | Samsung Galaxy Z Flip 6 | |
| Cover display size, tech, resolution, refresh rate | 4.1-inch AMOLED, 948×1,048p, 120Hz refresh rate | 3.4-inch AMOLED; 720 x 748 pixels; 60Hz refresh rate | 4-inch pOLED, 2,992×1,224p, up to 165Hz variable refresh rate | 3.4-inch AMOLED; 720 x 748 pixels; 60Hz refresh rate |
| Internal display size, tech, resolution, refresh rate | 6.9-inch AMOLED, 2,520×1,080p, 1-120Hz refresh rate | 6.7-inch AMOLED; 2,640 x 1,080 pixels; 1-120Hz refresh rate | 7-inch AMOLED; 1,272×1,080p, up to 165Hz variable refresh rate | 6.7-inch AMOLED; 2,640 x 1,080 pixels; 1-120Hz refresh rate |
| Pixel density | Cover: 342ppi; Internal: 397ppi | Cover: 306 ppi; Internal: 425 ppi | Cover: 417 ppi; 464 ppi | Cover: 306 ppi; Internal: 425 ppi |
| Dimensions (inches) | Open: 2.96 x 6.56 x 0.26 in; Closed: 2.96 x 3.37 x 0.26 in | Open: 6.5 x 2.83 x 0.27 in Closed: 3.35 x 2.83 x 0.59 in | Open: 2.91 x 6.75 x 0.28 inches Closed: 2.91 x 3.47 x 0.62 inches | Open: 6.5 x 2.83 x 0.27 in Closed: 3.35 x 2.83 x 0.59 in |
| Dimensions (millimeters) | Open: 75.2 x 166.7 x 6.5mm; Closed: 75.2 x 85.5 x 13.7mm | Open: 165.1 x 71.9 x 6.9mm Closed: 85.1 x 71.9 x 14.9mm | Open: 73.99 x 171.48 x 7.19mm Closed: 73.99 x 88.12 x 15.69mm | Open: 165.1 x 71.9 x 6.9mm Closed: 85.1 x 71.9 x 14.9mm |
| Weight (grams, ounces) | 188g (6.63 oz.) | 187g (6.6 oz) | 199g (7 oz) | 187g (6.6 oz) |
| Mobile software | Android 16 | Android 16 | Android 15 | Android 14 |
| Cameras | 50-megapixel (wide), 12-megapixel (ultrawide) | 50-megapixel (wide), 12-megapixel (ultrawide) | 50-megapixel (wide), 50-megapixel (ultrawide) | 50-megapixel (wide), 12-megapixel (ultrawide) |
| Internal screen camera | 10-megapixel | 10-megapixel | 50-megapixel | 10-megapixel |
| Video capture | 4K | TBD | 4K | TBD |
| Processor | Samsung Exynos 2500 | Samsung Exynos 2400 | Snapdragon 8 Elite | Snapdragon 8 Gen 3 |
| RAM/storage | 12GB + 256GB, 12GB + 512GB | 8GB + 128GB, 256GB | 16GB + 512GB, 1TB | 12GB + 256GB, 512GB |
| Expandable storage | None | None | None | None |
| Battery | 4,300 mAh | 4,000 mAh | 4,700 mAh | 4,000 mAh |
| Fingerprint sensor | Yes | Side | Side | Side |
| Connector | USB-C | USB-C | USB-C | USB-C |
| Headphone jack | None | None | None | None |
| Special features | One UI 8, IP48 water resistance, 25W wired charging, Qi wireless charging, Wi-Fi 7, Bluetooth 5.4, Galaxy AI | IP48 rating, 25W wired charging, wireless charging + powershare, 2x optical zoom (up to 10x digital) | IP48 rating, 68-watt wired charging, 30-watt wireless charging, 5-watt reverse charging, dual stereo speakers, Corning Gorilla Glass Ceramic cover dispaly, 3,000 nits peak brightness on cover display, 4,500 nits peak brightness on main display, 5G. | IP48 rating, 25W wired charging, wireless charging + powershare, 3x optical zoom (up to 10x digital and 30x Space Zoom with AI Super Resolution tech) |
| US price starts at | $1,100 | $900 | $1,300 | $1,100 |
How we test phones
Every phone CNET’s reviews team tests is used in the real world. We test a phone’s features, play games and take photos. We examine the display to see if it’s bright, sharp and vibrant. We analyze the design and build to see how it is to hold and whether it has an IP rating for water resistance. We push the processor’s performance to the extremes using standardized benchmark tools like GeekBench and 3DMark, along with our own anecdotal observations navigating the interface, recording high-resolution videos and playing graphically intense games at high refresh rates.
All the cameras are tested in a variety of conditions, from bright sunlight to dark indoor scenes. We try out special features like night mode and portrait mode, and compare our findings against similarly priced competing phones. We also check out the battery life by using it daily as well as running a series of battery drain tests.
We take into account additional features like support for 5G, satellite connectivity, fingerprint and face sensors, stylus support, fast charging speeds and foldable displays, among others that can be useful. We balance all of this against the price to give you the verdict on whether that phone, whatever price it is, actually represents good value. While these tests may not always be reflected in CNET’s initial review, we conduct follow-up and long-term testing in most circumstances.
Technologies
Kohler Wants to Put a Tiny Camera in Your Toilet and Analyze the Contents
The company’s new Dekoda toilet accessory is like a little bathroom detective.
Some smart litter boxes can monitor our pets’ habits and health, so having a camera in our human toilet bowls seems inevitable. That’s just what kitchen and bathroom fixture company Kohler has done for its new health and wellness brand, Kohler Health.
The $599 Dekoda clamps over the rim like a toilet bowl cleaner, pointing an optical sensor at your excretions and secretions. It then analyzes the images to detect any blood and reviews your gut health and hydration status. Depending on the plan you choose, the subscription fee is between $70 and $156 per year.
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At toilet time, you sign in via a fingerprint sensor so that the device knows who’s using the facilities. (Please wash your hands before signing out or tracking your progress.) Then, check in with the app for the day’s analysis and trends over time.
Wait until you’re off the pot, though, before you start doomscrolling your health. The device has a removable, rechargeable battery and uses a USB connection.
Kohler says it secures your data via the aforementioned fingerprint scanner and end-to-end encryption, and notes that the camera uses «discreet optics,» looking only at the results, not your body parts.
«Dekoda’s sensors see down into your toilet and nowhere else,» the company says.
Kohler warns that the technology doesn’t work very well with dark toilet colors, which makes sense. I’m sure there could be an upsell model with a light on it. Maybe the company could add an olfactory sensor, since smell reveals a lot about your gut health too. It could track «session» length or buildup under the rim to alert whoever has responsibility to clean it.
Kohler must have been straining to find appropriate lifestyle photos to include with the publicity materials. Many of the images are hilarious, featuring fit-looking men and women drinking water and staring off into space contemplatively — probably thinking about gas.
Technologies
Who’s Up to Fight Mega-Corporations in the Outer Worlds 2 on Xbox Game Pass?
Save the universe by fighting one CEO at a time in The Outer Worlds 2, plus play other great games coming to Xbox Game Pass in October.
Space is the final frontier, and it’s packed with some devious mega-corporations who are out to make a buck in The Outer Worlds 2. Xbox Game Pass subscribers can fight them in the highly anticipated sequel starting on Oct. 29.
Xbox Game Pass offers hundreds of games you can play on your Xbox Series X, Xbox Series S, Xbox One, Amazon Fire TV, smart TV and PC or mobile device, with prices starting at $10 a month. While all Game Pass tiers offer you a library of games, Game Pass Ultimate ($30 a month) gives you access to the most games, as well as Day 1 games, like Hollow Knight: Silksong, added monthly.
Here are all the games subscribers can play on Game Pass soon. You can also check out other games the company added to the service in October, including Ninja Gaiden 4.
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PowerWash Simulator 2
Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 23.
If you’ve ever spent hours watching people on YouTube clean dirty rugs, cars and other grimy objects, you should check out PowerWash Simulator 2. As the name suggests, this sequel is all about blasting away dirt and filth from pools, homes and other objects around town. You have a furry kitty companion, and yes, you can pet them when you’ve finished cleaning.
Bounty Star
Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 23.
The American Southwest has devolved into a lawless, post-apocalyptic desert called the Red Expanse in this game. You’re out to clean the place up in this game by taking down major bounties issued by the government, and the best way to do that is by piloting and customizing a giant mech, of course. When you want to nurse your wounds, head back to your run-down garage to rest, grow and cook food and raise animals. It’s like a cozy Armored Core game.
Super Fantasy Kingdom (game preview)
Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 24.
After returning from a hunting trip, you find your 8-bit kingdom wrecked in this game. You must rebuild your domain in this roguelite, city builder. But as night falls, hordes of monsters emerge to tear everything back down. Build, mine, cook and grow your home, and prepare to defend it from all dangers.
Halls of Torment
Game Pass Ultimate, Game Pass Premium and PC Game Pass subscribers can start playing on Oct. 28.
Get ready to descend into the deadly Halls of Torment in this retro, horde survival game. You can choose between 11 playable characters, each with their own playstyle, and equip various items and abilities to survive waves of enemies. This game is like Vampire Survivors, so if you like that game give this one a shot.
The Outer Worlds 2
Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 29.
Clear your calendar for this sequel to the award-winning sci-fi adventure, The Outer Worlds. This time, you’re an Earth Directorate agent investigating the cause of devastating rifts that could destroy humanity. You have a new ship, new crew, new enemies and mega-corporation goons standing between you and the answers.
1000xResist
Game Pass Ultimate, Game Pass Premium and PC Game Pass subscribers can start playing on Nov. 4.
One thousand years in the future, humanity is hanging on by a thread after a disease spread by alien occupation forces people to live underground in this sci-fi adventure game. You play as Watcher, and you fulfill your duties well, until one day you make a shocking discovery. This game won a Peabody Award in 2024, and it was nominated for the Nebula Award for Best Game Writing that same year, so get ready for a story like no other.
Football Manager 26
Game Pass Ultimate and PC Game Pass subscribers can start playing on Oct. 29.
Get ready for a more immersive matchday experience in the latest installment of the Football Manager franchise. You can build a star-studded squad with new transfer tools, and this entry features official Premier League licenses and women’s football for the first time in the series’ history.
Game Pass subscribers can play the standard or Console edition of this game.
Games leaving Game Pass on Oct. 31
While Microsoft is adding those games to Game Pass, it’s also removing three others from the service on Oct. 31. So you still have some time to finish your campaign and any side quests before you have to buy these games separately.
Jusant
Metal Slug Tactics
Return to Monkey Island
For more on Xbox, discover other games available on Game Pass now and check out our hands-on review of the gaming service. You can also learn about recent changes to the Game Pass service.
Technologies
Does Charging Your Phone Overnight Damage the Battery? We Asked the Experts
Modern smartphones are protected against overcharging, but heat and use habits can still degrade your battery over time.
Plugging your phone in before you head to bed might seem like second nature. That way by the time your alarms go off in the morning, your phone has a full charge and is ready to help you conquer your day. However, over time, your battery will start to degrade. So is keeping your phone plugged in overnight doing damage to the battery?
The short answer is no. Keeping your phone plugged in all the time won’t ruin your battery. Modern smartphones are built with smart charging systems that cut off or taper power once they’re full, preventing the kind of «overcharging damage» that was common in older devices. So if you’re leaving your iPhone or Android on the charger overnight, you can relax.
That said, «won’t ruin your battery» doesn’t mean it has no effect. Batteries naturally degrade with age and use, and how you charge plays a role in how fast that happens. Keeping a phone perpetually at 100% can add extra stress on the battery, especially when paired with heat, which is the real enemy of longevity.
Understanding when this matters (and when it doesn’t) can help you make small changes to extend your phone’s lifespan.
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The science behind battery wear
Battery health isn’t just about how many times you charge your phone. It’s about how it manages voltage, temperature and maintenance. Lithium-ion batteries age fastest when they’re exposed to extreme levels: 0% and 100%.
Keeping them near full charge for long stretches puts additional voltage stress on the cathode and electrolyte. That’s why many devices use «trickle charging» or temporarily pause at 100%, topping up only when needed.
Still, the biggest threat isn’t overcharging — it’s heat. When your phone is plugged in and running demanding apps, it produces heat that accelerates chemical wear inside the battery. If you’re gaming, streaming or charging on a hot day, that extra warmth does far more harm than leaving the cable plugged in overnight.
Apple’s take
Apple’s battery guide describes lithium-ion batteries as «consumable components» that naturally lose capacity over time. To slow that decline, iPhones use Optimized Battery Charging, which learns your daily routine and pauses charging at about 80% until just before you typically unplug, reducing time spent at high voltage.
Apple also advises keeping devices between 0 to 35 degrees Celsius (32 to 95 degrees Fahrenheit) and removing certain cases while charging to improve heat dissipation. You can read more on Apple’s official battery support page.
What Samsung (and other Android makers) do
Samsung offers a similar feature called Battery Protect, found in One UI’s battery and device care settings. When enabled, it caps charging at 85%, which helps reduce stress during long charging sessions.
Other Android makers like Google, OnePlus and Xiaomi include comparable options — often called Adaptive Charging, Optimized Charging or Battery Care — that dynamically slow power delivery or limit charge based on your habits. These systems make it safe to leave your phone plugged in for extended periods without fear of overcharging.
When constant charging can hurt
Even with these safeguards, some conditions can accelerate battery wear. As mentioned before, the most common culprit is high temperature. Even for a short period of time, leaving your phone charging in direct sunlight, in a car or under a pillow can push temperatures into unsafe zones.
Heavy use while charging, like gaming or 4K video editing, can also cause temperature spikes that degrade the battery faster. And cheap, uncertified cables or adapters may deliver unstable current that stresses cells. If your battery is already several years old, it’s naturally more sensitive to this kind of strain.
How to charge smarter
You don’t need to overhaul your habits but a few tweaks can help your battery age gracefully.
Start by turning on your phone’s built-in optimization tools: Optimized Battery Charging on iPhones, Battery Protect on Samsung devices and Adaptive Charging on Google Pixels. These systems learn your routine and adjust charging speed so your phone isn’t sitting at 100% all night.
Keep your phone cool while charging. According to Apple, phone batteries perform best between 62 and 72 degrees Fahrenheit (16 to 22 degrees Celsius). If your phone feels hot, remove its case or move it to a better-ventilated or shaded spot. Avoid tossing it under a pillow or too close to other electronics, like your laptop, and skip wireless chargers that trap heat overnight.
Use quality chargers and cables from your phone’s manufacturer or trusted brands. Those cheap «fast-charge» kits you find online often deliver inconsistent current, which can cause long-term issues.
Finally, don’t obsess over topping off. It’s perfectly fine to plug in your phone during the day for short bursts. Lithium-ion batteries actually prefer frequent, shallow charges rather than deep, full cycles. You don’t need to keep it between 20% and 80% all the time, but just avoid extremes when possible.
The bottom line
Keeping your phone plugged in overnight or on your desk all day won’t destroy its battery. That’s a leftover myth from a different era of tech. Modern phones are smart enough to protect themselves, and features like Optimized Battery Charging or Battery Protect do most of the heavy lifting for you.
Still, no battery lasts forever. The best way to slow the inevitable is to manage heat, use quality chargers and let your phone’s software do its job. Think of it less as «babying» your battery and more as charging with intention. A few mindful habits today can keep your phone running strong for years.
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