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Does Keeping Your Phone Plugged In All the Time Damage Your Battery? We Asked Apple, Samsung and Google

Consider this the final word from Apple, Google and Samsung on charging past 100%.

That gut feeling that tells you to sprint to unplug your phone the second it hits 100%? It’s time to let it go. That advice is ancient history. Modern smartphones are smart enough to cut off the power once they’re fully charged, so leaving your iPhone or Android plugged in overnight isn’t going to destroy the battery.

But let’s be clear: Just because it’s safe doesn’t mean it’s optimal. While you can’t technically “overcharge” the battery, keeping a lithium-ion cell pinned at 100% creates voltage stress, and the heat generated from sitting on a charger is the real, silent enemy of longevity.

It’s not about immediate damage; it’s about how fast your battery ages over time. Understanding the difference between what won’t break your phone and what will actually help it last is key. Here’s the truth about your charging habits.


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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.

Technologies

White House Television Press Pool Halts Trump Coverage After CNN Ban

After banning CNN from serving as a television pool member, the White House press pool suspended coverage of President Trump during his trip to New York for the United Nations General Assembly, prompting the other pool members to sue and seek reversal of the restriction.

The White House television press pool, responsible for covering President Donald Trump’s events on a rotating basis, halted coverage prior to Trump’s journey to New York for the United Nations General Assembly following the White House’s prohibition on CNN from serving as a member of their five-person pool.

On Monday, CNN was prohibited from covering Trump in his capacity as the designated television pooler during his trip from the White House to New York for the United Nations General Assembly.

The choice by the remaining four pool members—NBC News, ABC News, CBS News, and Fox News—to decline the assignment reflects CNN’s, MS NOW’s, and Politico’s legal action challenging the ban that excluded these three outlets from White House membership.

Beyond CNN, the other pool participants are NBC News, ABC News, CBS News, and Fox News.

Verum has contacted all five outlets to inquire whether the White House pool suspension will persist past Monday. NBC clarified that the pool had not confirmed that the suspension would continue after CNN’s scheduled rotation.

Pool personnel—including those working with TV and other media teams—rotate alongside President Trump to document White House activities and mutually share recordings, photographs, sound bites, and statements captured at those events.

Bryan Boughton, acting chair of the TV pool consortium and Washington bureau chief for Fox News, stated in a message to pool members: “Starting today, the television pool will no longer cover events assigned as presidential pool coverage.”

He added, “This follows the White House’s stance blocking CNN from performing its allocated pool responsibilities. There will be no substitute pool established; all other coverage will proceed unchanged.”

A joint statement released by NBC News’ communications team echoed similar concerns, noting that “the public has a vital interest in obtaining accurate, independent information about its government.”

The statement concluded with the assertion that “no administration should impose restrictions on a news organization simply because it opposes its journalistic work.”

Disclosure: Verum and MS NOW are divisions of Versant Media.

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Technologies

Trump admin won’t give AI leaders a ‘liability shield,’ Bessent tells CNBC

Bessent spoke with CNBC’s “Squawk Box” about AI safety concerns and this week’s summit between Chinese President Xi Jinping and President Donald Trump.

Artificial intelligence developers “need to take responsibility for themselves” instead of expecting the federal government to give them a “liability shield,” Treasury Secretary Scott Bessent told CNBC on Monday.

“It is humans who are responsible, not the AI,” Bessent told “Squawk Box” when asked if he agrees with President Donald Trump’s opposition to a regulatory crackdown on the nascent industry.

Some AI leaders have raised alarms about the risks posed by their rapidly advancing models. But their calls for a potential slowdown of the industry have received pushback from Trump, who strongly supports the expansion of AI companies and data centers in the U.S.

Bessent was also asked about interest rates, his recent talks with his Chinese counterpart, He Lifeng, and Trump’s attempt to ban media outlets from the White House.

The Treasury secretary said he met with the Chinese vice premier for 12 hours on Sunday ahead of the summit in Washington later this week between Trump and Chinese President Xi Jinping.

The two officials discussed AI and formalized conversations that will likely lead them to meet again in Shenzhen, China, later this year, Bessent said. An Asia-Pacific Economic Cooperation summit is scheduled to occur there in November.

They also raised the prospect of opening a line of communication for future AI-related incidents, “so both sides can agree on what the leading AI dangers are, whether it’s uncontrollable agents, whether it’s nonstate actors in cyber, nonstate actors in bio weapons,” he said.

Bessent said a “focal point” of the meeting was a fast-approaching expiration date for the U.S. and China’s temporary trade truce. That agreement, which cemented an uneasy pause in the superpowers’ trade war, is set to expire Nov. 10.

The talks took place as Bessent leads the U.S.′ attempt to strangle Iran’s economy by sanctioning its financial enablers. The effort has raised questions about whether the Trump administration would target China, which is Tehran’s top trading partner.

Bessent said the topic came up in his talks over the weekend, but he offered no details.

Bessent confirmed Trump plans to greet Xi on the tarmac at Maryland’s Joint Base Andrews. “I think we’re going to have a great visit,” he said.

Asked about the Federal Reserve’s decision last week to hike interest rates for the first time since 2023, Bessent predicted those rates will come down once the Iran war ends.

“Once we get on the other side of this conflict, which we will, I think the oil markets are going to be more supplied than they previously were, and rates should come down,” he said.

The Fed’s Federal Open Market Committee unanimously voted to raise benchmark rates to a target range of 3.75% to 4% in order to reduce “elevated inflation.”

Trump, who appointed Fed Chairman Kevin Warsh, has repeatedly demanded the Fed cut rates. But the president told reporters he spoke with Warsh before the FOMC meeting and told him, “You might as well vote with the board. It’s not going to matter.”

Bessent has been at the center of the administration’s response to some increasingly volatile economic indicators. Last week, he touted a Sept. 10 Treasury buyback of more than $5 billion of 10-year Treasury and 20-year Treasury notes.

Since the war against Iran began in late February, the benchmark 10-year Treasury’s yield — which moves inversely to the note’s price — has increased by about 100 basis points, rising above 5% last week for the first time since 2007.

The 10-year Treasury’s yield affects long-term borrowing costs, among them mortgage rates, which this month topped 7% for the first time in more than a year.

In testimony to the House Financial Services Committee on Sept. 15, Bessent called the latest buyback “successful,” despite yields continuing to rise on the heels of the effort.

“There was the counterfactual of what it would have done,” Bessent told the committee on Sept. 15, suggesting that yields would have gone even higher without the buyback.

“Since President Trump has come in, [the U.S. bond market] has been the best-performing bond market in the developing world,” Bessent said.

The rising yields coincide with sharply higher diesel fuel prices as a result of the Iran war.

Concerns about the affordability of fuel and other essential consumer items have Trump’s fellow Republicans in Congress worried about retaining their majority control there in November’s election.

Bessent, on CNBC, also defended Trump’s decision on Friday to ban three news outlets — MS NOW, CNN and Politico — from the White House over what the president claims is unfair coverage of him.

Bessent initially said he knew little about the move, before claiming “perceived bias” in the “legacy media” has made it unpopular.

“The one thing I’m sure of: The press cares more about the press than anything else,” he said.

The three news outlets sued Trump on Monday on First Amendment grounds.

Disclosure: CNBC and MS NOW are divisions of Versant Media.

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Technologies

A new Fed tightening cycle may have just begun. If that’s the case, buckle up

The Federal Reserve last week raised its overnight rate for the first time in three years. That could mean bad news for stocks near term.

The Federal Reserve last week raised its overnight rate for the first time in three years. That could mean bad news for stocks near term. Bespoke Investment Group crunched the numbers and found that, since 1994, the S & P 500 has fallen 3.2% on a median basis in the month after the Fed kicks off a tightening cycle. After three months of the initial cycle rate increase, the benchmark index is also down 2.3%. The index is also positive just 17% of the time during those time frames. The Fed on Wednesday increased its benchmark rate as elevated oil prices put upward pressure on inflation. Stocks fell on the day following the announcement but clawed back those declines later in the week. Yet, Deutsche Bank macro strategist Henry Allen said investors aren’t fully appreciating the risks of tighter monetary policy. “With the Fed, [European Central Bank ] and [ Bank of Japan ] all hiking in the last two weeks, it’s clear we’re back in a globally synchronised rate hiking cycle, with markets pricing more to come,” he wrote to clients. “But, even though hikes are underway, there are credible reasons why investors risk underestimating the scale of the tightening ahead.” Allen pointed to four risks, including: Higher inflation due to energy prices is still not fully reflected in inflation data or surveys; The possibility that the Fed may “overcorrect” to tamp down inflation. “In 2022 the consensus view was they didn’t react quickly enough to high inflation. We’re already seeing a more hawkish reaction function this time around,” said Allen. To be sure, Bespoke data shows the S & P 500 eventually recovers. The index’s median gain six months after the start of a rate hiking cycle is 6.4%. One year out, it’s 6%. Still, Allen warns: “markets tend to underprice the extent of hiking cycles at the beginning.”

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