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Is Always Charging Your Phone Bad for the Battery? Apple, Samsung and Google Weigh In

This is the million-dollar question most people want answered. Here’s what the experts have to say.

There was a time when smartphone users were warned not to leave their phones plugged in for too long, or it could do damage to the battery. While modern smartphones now have overcharge protection that keeps them safe, many people still have questions about whether keeping their phone perpetually plugged in will damage 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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Technologies

Tim Cook Riffs on Retirement Rumors, AI, Phone Addiction and Trump

The Apple CEO discussed a range of topics on Good Morning America.

Tim Cook isn’t going anywhere just yet — not during Apple’s 50th anniversary celebrations, not with the company preparing to introduce its first foldable phone, not while the tech giant is trying to figure out how to beat the AI race.

In a sit-down interview with Good Morning America host and Pro Football Hall of Famer Michael Strahan this week, Cook, who turned 65 in November, said there was no truth to the rumors that he is considering retiring from Apple. He became CEO of the company in 2011, 13 years after joining from Compaq.

«I love what I do deeply. Twenty-eight years ago, I walked into Apple, and I’ve loved every day of it since,» Cook told Strahan. «We’ve had ups and downs, but the people I work with are so amazing. They bring out the best in me, and hopefully I can bring out the best in them.»

Strahan interviewed Cook during the Apple CEO’s visit to Wadleigh Secondary School for the Performing & Visual Arts in Harlem, where students use Apple technology through the company’s partnership with the nonprofit Save the Music.

Speculation about Cook stepping down has been circulating since last November, when the Financial Times cited unnamed sources saying that Apple was preparing to usher in a new CEO «as soon as next year.» Bloomberg’s Mark Gurman threw water on that report, saying he «would be shocked if Cook steps down in the time frame outlined by the FT.»

During Cook’s tenure as CEO, Apple’s revenue has nearly quadrupled, with the tech giant adding dozens of new iPhone models, several more iPads, and updated Apple Watches and AirPods. This year, Apple has launched several new products, including the MacBook Neo, which at $599 has disrupted the budget laptop market. The company’s first foldable phone could come later this year.

Touch some grass

The GMA interview was short but wide-ranging, including Cook’s thoughts on how much people use their iPhones. Many studies estimate that people across most generations spend at least 4 hours a day on their phones, with millennials and Gen Z spending 5 to 6 hours.

When asked what he worries about most regarding Apple products’ impact on society, Cook weighed in, telling Strahan he doesn’t want people using iPhones «too much.» 

«I don’t want people looking at the smartphone more than they’re looking in someone’s eyes,» Cook said, «because if they’re just scrolling endlessly, this is not the way you want to spend your day. Go out and spend it in nature.»

More on Apple from CNET: 

AI and privacy

Cook told Strahan that AI «can be so positive,» but his response when asked whether he was «worried» about it was fairly flat.

«Technology doesn’t want to be good, and it doesn’t want to be bad,» Cook said. «It’s in the hands of the user and the hands of the inventor.»

Strahan questioned how much of iPhone users’ private lives are feeding Apple’s AI learning machine. Cook told him that because the smartphone is encrypted, Apple doesn’t have access to it. He went on to say: «When we can’t answer a question on your device, we send it to something called private cloud compute, which is essentially a big device in the sky that has the same kind of security and architecture as your phone.»

On its website, Apple says that it «does not use our users’ private personal data or user interactions when training our foundation models.»

To date, Apple has been cautious in diving into the AI scrum. While Amazon, Alphabet, Meta and Microsoft are spending nearly $700 billion combined on AI tech this year, Apple is «only» investing $14 billion.

Trump and tariffs

Cook has been criticized for being too cozy with the Trump administration: donating $1 million to President Donald Trump’s inauguration; giving him a 24-karat gold plaque; and attending a White House screening of Melania, a film about the First Lady.

The Apple CEO told Strahan that he’s «not a political person» on either side.

«I’m kind of straight down the middle, and I focus on policy,» Cook said. «So, I’m very pleased that the president and the administration is accessible to talk about policy.»

One of those policies has been tariffs, which Trump has imposed on many nations to varying degrees during his second term in office, purportedly to pressure companies to shift their manufacturing to the US. The president has largely spared Apple, which promised to invest $600 billion over four years to make more products in the US.

Cook told Strahan that the glass for the front and back of an iPhone will come out of Kentucky by the end of the year, and that 100 million chip engines will be manufactured in Arizona this year. He also noted that 20 billion semiconductors will be made in the US. «We’re a very proud American company, and we want to do as much here as we can,» Cook said. 

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Technologies

Today’s NYT Connections Hints, Answers and Help for March 19, #1012

Here are some hints and the answers for the NYT Connections puzzle for March 19 #1012.

Looking for the most recent Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle, Connections: Sports Edition and Strands puzzles.

Today’s NYT Connections puzzle features another tricky purple category, where words hide inside the clues and you have to dig them out. Read on for clues and today’s Connections answers.

The Times has a Connections Bot, like the one for Wordle. Go there after you play to receive a numeric score and to have the program analyze your answers. Players who are registered with the Times Games section can now nerd out by following their progress, including the number of puzzles completed, win rate, number of times they nabbed a perfect score and their win streak.

Read more: Hints, Tips and Strategies to Help You Win at NYT Connections Every Time

Hints for today’s Connections groups

Here are four hints for the groupings in today’s Connections puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Children’s stories.

Green group hint: Lucky charms.

Blue group hint: One color, then the next.

Purple group hint: Hidden words relating to music.

Answers for today’s Connections groups

Yellow group: Folk tale characters.

Green group: Good luck symbols.

Blue group: Things that change color.

Purple group: Ending in music genres.

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections answers?

The yellow words in today’s Connections

The theme is folk tale characters. The four answers are Chicken Little, Frog Prince, Gingerbread Man and Goldilocks.

The green words in today’s Connections

The theme is good luck symbols. The four answers are evil eye, four-leaf clover, horseshoe and rabbit’s foot.

The blue words in today’s Connections

The theme is things that change color. The four answers are chameleon, mood ring, sunset and traffic light.

The purple words in today’s Connections

The theme is ending in music genres. The four answers are baby blues, pet rock, scrap metal and soda pop.

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Technologies

Today’s NYT Connections: Sports Edition Hints and Answers for March 19, #542

Here are hints and the answers for the NYT Connections: Sports Edition puzzle No. 542 for Thursday, March 19.

Looking for the most recent regular Connections answers? Click here for today’s Connections hints, as well as our daily answers and hints for The New York Times Mini Crossword, Wordle and Strands puzzles.

Today’s Connections: Sports Edition is tricky. Remember that many athletes’ surnames look like common words, so if you’re having trouble sorting the answers, think about whether a particular word could be someone’s last name. If you’re struggling with today’s puzzle but still want to solve it, read on for hints and the answers.

Connections: Sports Edition is published by The Athletic, the subscription-based sports journalism site owned by The Times. It doesn’t appear in the NYT Games app, but it does in The Athletic’s own app. Or you can play it for free online.

Read more: NYT Connections: Sports Edition Puzzle Comes Out of Beta

Hints for today’s Connections: Sports Edition groups

Here are four hints for the groupings in today’s Connections: Sports Edition puzzle, ranked from the easiest yellow group to the tough (and sometimes bizarre) purple group.

Yellow group hint: Football division.

Green group hint: They catch the pigskin.

Blue group hint: College hoopsters.

Purple group hint: Where’s the glass slipper?

Answers for today’s Connections: Sports Edition groups

Yellow group: NFC East teams.

Green group: Hall of Fame wide receivers.

Blue group: Stars in this year’s men’s NCAA tournament.

Purple group: Notable NCAA tournament Cinderellas.

Read more: Wordle Cheat Sheet: Here Are the Most Popular Letters Used in English Words

What are today’s Connections: Sports Edition answers?

The yellow words in today’s Connections

The theme is NFC East teams. The four answers are Commanders, Cowboys, Eagles and Giants.

The green words in today’s Connections

The theme is Hall of Fame wide receivers. The four answers are Bruce, Monk, Moss and Rice.

The blue words in today’s Connections

The theme is stars in this year’s men’s NCAA tournament. The four answers are Acuff, Boozer, Dybantsa and Peat.

The purple words in today’s Connections

The theme is notable NCAA tournament Cinderellas. The four answers are Patriots, Peacocks, Ramblers and Rams.

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