Phone battery draining fast? Malware is one of 8 possible factors – how to tell for sure


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ZDNET’s key takeaways

  • There are many possible causes of your phone’s battery degradation.
  • Identifying the reasons for deteriorating battery life can be challenging
  • Sometimes the culprit is malware: How to identify and remove it.

Lately, is your smartphone consuming more power more quickly, and your battery life deteriorating? Could malware be responsible? OK, let’s take a deep breath. Before we walk you through the steps to investigate and fix a malware problem on your phone, let’s look at some other possible culprits behind your power issue.

Batteries age, get damaged, and become less efficient as we repeatedly charge and drain them. At first glance, high power consumption and a steep drop in the number of hours a full charge lasts might raise the alarm that something is on your smartphone that shouldn’t be there. Mobile malware is designed to stay hidden, which means your phone battery could be dying as malicious software quietly drains your power without any signs, notifications, or other strange behavior. 

Also: This silent Android feature scans your photos for ‘sensitive content’ – how to uninstall it

However, there are many other reasons why your device is not operating as it should: lithium-ion batteries die, need to be replaced, and won’t last forever. There are also plenty of other environmental factors, app changes, and settings to consider before you decide to purchase a new battery or switch to a different smartphone altogether.

Here are 7 things to consider. Already looked into everything on our checklist? Scroll down for our tips on identifying and removing malware from your device.

1: Check your battery usage

The first step in solving a problem is understanding it; let’s check how your battery is being used, and by what. 

The way to check your battery usage on Android and iOS is very similar. Hop into settings, select the battery tab, and — depending on the make and model of your device — select an option such as battery usage or apps. On this screen, you can explore which apps are using the most battery (and when).

battery usage example android

Charlie Osborne/ZDNET

Keep in mind that batteries are only optimal for around three years, and battery capacities vary. Lithium-ion batteries will always degrade over time, so you will find that performance suffers every year you use the same hardware. 

It might not be by much at the start, but if you suddenly notice your battery isn’t lasting nearly as long as it should, consider whether you’ve had to charge it more and more over the years. You might already have your answer as to the cause of your dying battery.

2. Consider your apps and their permissions

You should also look for any unfamiliar apps on your mobile device. If you spot any app you are unfamiliar with or no longer use — especially if it tends to consume a lot of power — it might be the right time to delete it.

Also: We know what’s making your phone’s battery drain so quickly

For example, let’s say you’ve recently downloaded a mobile game. You then notice it is constantly running in the background and using more power than you might expect. If you’re constantly running a power-hungry mobile game, an AI assistant, or leaving TikTok live streams open for hours, this will reduce your battery life.

I picked up my Samsung Galaxy Z Fold6 at launch in 2024, and while it is only a few years old, it now frequently consumes 10% to 15% of my battery during a 20- to 30-minute FaceTime call, when it used to be far more efficient. 

You should also check app permissions to see if you’ve granted your apps more control than they need, as this could contribute to overall battery consumption — especially if these apps are allowed to run in the background, are constantly syncing, or are always connected to phone functions such as location sharing. 

3. Check your phone settings

These are some of the most important smartphone settings that can contribute to poor battery life:

Also: 12+ iPhone settings you can change to noticeably improve its battery life (iOS 26 and older)

  • Screen brightness: If it’s set to maximum, it can reduce battery life.
  • Always-on displays: Enabling an always-on display will use more battery than allowing your smartphone’s display to turn off after a set period (also known as a screen timeout). 
  • Battery saver: Battery-saving options limit battery-hungry phone functions such as syncing, HDR display use, and location checks, while also reducing your screen brightness. Enabling this function can keep your phone going for longer.
  • App syncing: Allowing apps to run in the background and frequently sync with services — such as email and social media — could reduce the hours of battery life you can expect on a single charge. 
  • Animated wallpapers and themes: Animated graphics, wallpapers, and themes — especially when displayed at high resolution — will contribute to a loss of battery life. It might not be much, but over the course of a day with an always-on display, it could be more than you think.
  • Location services: Allowing location services and GPS pings to run continuously will drain your battery over the course of the day.
  • Wearables and Bluetooth: A factor some of us might overlook is the Bluetooth connection between our smartphone and our wearable, such as a smartwatch. If this connection is active daily, the constant communication between the two devices may impact your battery. 

4. Update your operating system and apps

Ensure all your apps and the operating system are up to date. Fixes are frequently pushed to address software issues that could affect your handset’s performance. This includes system apps using too much power, excessive synchronization, and OS optimization to reduce battery demand. 

5. Consider environmental factors

If your smartphone has been exposed to direct sunlight and hot or cold temperatures for an extended period, your battery may be affected. 

Also: I changed 12 settings on my Android phone to extend its battery life by hours

Lithium-ion batteries naturally degrade over time, but extreme environmental conditions can accelerate this process. Hot cars, the beach, leaving your phone on the table at a cookout when the sun is shining bright — if your smartphone becomes hot, your battery will drain. Furthermore, if it is too cold, this can affect the chemical reactions in your handset, reducing battery power and performance.

6. Is your hardware old or damaged?

Batteries simply don’t last. The constant cycle of charging and recharging will, over time, reduce its performance. It might also be defective. 

If you’ve had your smartphone for a while, it might simply be time to replace the battery. In addition, if any water or other fluids have come into contact with your smartphone, it may have damaged its internal components — including the battery. (Please don’t microwave it; that myth will toast your battery far more than leaving it in the sun.)

7. How are you charging, and is it wireless?

Another factor to consider is how you are charging your device. As noted by power bank manufacturer Anker, a concern with wireless chargers is heat generation, as electromagnetic radiation can cause your smartphone to heat up, reducing battery performance.

You may also not realize it, but fully charging your device during cycles can also degrade your battery over time. It’s best to keep the charge level between 20% and 80%. 

I’m still concerned. Could it be mobile malware?

Mobile malware is malicious software, usually disguised as a benign mobile app. Mobile malware can end up on your handset through phishing and by clicking links that download the software; by accidentally downloading apps online that have hidden, malicious functions; or installed quietly by someone with access to your smartphone without your knowledge, such as in cases of stalking or domestic abuse

Infrequently, malicious apps can end up in official app stores such as Google Play or Apple’s App Store, even though both Apple and Google have stringent protections in place to prevent this. 

AlsoThe best mobile antivirus software: Expert tested and reviewed

If malware is installed on your smartphone, it may steal your username and password for online accounts; monitor your location, calls, and social media activity; record audio and video; destroy or steal your data; show you unwanted pop-ups; and even register you for premium calls & SMS services. 

Mobile malware is designed to remain hidden and operate quietly in the background, but unexpected battery usage can be a potential symptom. Trojans designed to steal your information are the most common mobile malware threats, but if you stick with official app stores and keep your phone updated, you will reduce the likelihood of encountering one. 

Found something strange? Delete suspicious apps immediately

If you’re unsure about an app — it’s unfamiliar, or you simply don’t use it anymore — delete it. This is as simple as holding your finger down on the app icon and selecting the option to delete the app, or going into the apps section of your handset to remove it.

After you find and remove an app, change your passwords for any accounts connected to your smartphone, just to be safe. 

Run a malware scan

The next step is to run a malware scan on your smartphone. Malware scanners and antivirus programs run in the same way that they would on your desktop PC or laptop; they check the validity of your files and apps, analyze suspicious code, and warn you if you need to quarantine any apps.

Popular options include Bitdefender, Avast, and AVG. If you would like to view our favorites, check out our guide to mobile antivirus software.

Should I factory reset if I find mobile malware?

While most forms of malware can be eradicated with a factory reset, this is often the last resort. A factory reset will restore your phone to its default settings and delete all your apps, files, photos, videos, and contacts. You will also have to reinstall your favorite apps. 

Also: How to factory reset your Android phone without unlocking it first

Only consider this solution if you must. Basic mobile malware — those that bombard you with adverts and pop-ups — will likely be removed with a simple scan, but if you have become the victim of stalkerware, for example, a factory reset might give you more peace of mind. 

If you feel it is in your best interests, perform a factory reset. However, you could also consider taking your handset to a specialist who can deal with the infection — or safely copy over your important files first. 





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The Paradox of Preppers Who Want Stock Tips

I’ve had some rather paradoxical conversations in recent weeks. One second, I’m standing there talking to people about prepping—buying water, hand-crank radios, and whatnot. Then two minutes later, they’re asking me, “Lars, which shares should I buy?” There’s something deeply contradictory about that, isn’t there?

This captures the strange moment we find ourselves in. Drones are flying over Copenhagen, jet fighters are scrambling over Danish airspace, and yet many Danish investors have made substantial money on their shares in recent years. The disconnect between our anxieties and our investment behaviours has never been more pronounced.

We’re facing what I’d characterise as three dark clouds hanging over the investment landscape. These aren’t merely theoretical concerns—they’re real, measurable risks that could fundamentally alter the investment environment we’ve grown accustomed to over the past decade.

Three Dark Clouds Over the Financial Markets

The Sovereign Debt Crisis: My Greatest Concern

Let me be absolutely clear: the sovereign debt crisis is my greatest concern. The United States has public debt exceeding 100% of GDP. Britain faces similar challenges. We’re seeing massive deficits—in America, it’s somewhere between 6 and 8% of GDP this year, depending on how you calculate it. France has major problems. Japan has major problems. Italy has major problems.

The American federal government’s interest payments will soon reach 5% of GDP. That’s more than the Americans spend on defence. Think about that for a moment—roughly a quarter of all federal tax revenues will go to servicing debt. If interest rates rise, you can see how this becomes extremely difficult to manage.

Here’s the crucial calculation: if interest rates are higher than nominal GDP growth, you get an explosive development in debt as a percentage of GDP. Let’s say the American economy grows at 2% in real terms with 2% inflation—that’s 4% nominal GDP growth. If the interest rate on government debt is 5%, the debt burden will simply grow and grow and grow.

Donald Trump has talked extensively about growing out of the debt problems with all his brilliant ideas that will boost growth. Unfortunately, there’s little evidence this is happening. We got labour market figures last week that further confirm the American labour market is cooling, and GDP growth in the first half of the year is below one and a half percent annualised. The economy isn’t booming.

But there’s another way to get nominal growth up—create inflation. Every Danish homeowner who owned property in the 1970s can tell you this story. The high inflation of the 1970s ate away homeowners’ debt. And if you’re a government that creates inflation, perhaps by ringing up the central bank and saying “print some money,” well, that solves one problem whilst creating another.

The temptation to let the printing press run becomes greater and greater if you don’t want to make difficult decisions. We’ve seen Donald Trump at war with the Federal Reserve. He’s talked about firing Lisa Cook, who sits on the Federal Reserve Board—though last week the American Supreme Court told him, “You can’t do that, Donald. You need to argue your case better.” That’s been kicked to the corner for now. But the pressure is there. He’s said he won’t reappoint Jerome Powell when his term expires next year. He’s appointed Stephen Rennenkampf to the FOMC, the leading monetary policy body at the Federal Reserve. Rennenkampf, you’ll recall, voted for a half-percentage-point rate cut rather than the quarter-point cut we got at the last FOMC meeting. These are all signs of politicisation.

Geopolitical Uncertainty: The Highest in 35 Years

The geopolitical situation must be described as unstable and frightening—probably the highest level of uncertainty in at least 30 to 35 years. We’ve had the drones over Copenhagen, the entire situation in Europe, and recently there’s been speculation about whether the Chinese might make moves regarding a possible invasion of Taiwan. We have the conflict in the Middle East—Iran, Israel, Gaza—which creates concerns.

As I write this, we’re not far from Forum Copenhagen where we recently had a major European summit. I must be honest there was a lot of police around. Many helicopters in the air. We’ve heard a jet fighter or two. I have children asking about all this. What’s all this about? It’s rather uncomfortable on a practical level.

When this starts affecting air traffic, potentially sea transport, our supply chains, company earnings, and economic development, it becomes negative for markets. So far, markets have taken it remarkably calmly, but the threat is there.

We’ve agreed in Europe that we need to increase our defence spending because there’s a genuine threat from Putin’s Russia. There’s much talk about why there wasn’t drone defence around Copenhagen Airport and other Danish airports. Because there hasn’t been a need for it – it was completely unthinkable just a few years ago, but suddenly it’s something we must consider.

Drone defence isn’t free. I don’t know what it costs to send an F-16 fighter jet up to fire missiles at drones over Copenhagen Airport, but it’s not cheap. And whilst I hope it doesn’t come to that, it’s a stark illustration that we need to spend more on defence in Denmark and Europe in general.

If we already have weak public finances in Europe (much less so in Denmark), this pushes the problem further. We need more money, which pushes interest rates up. More government bonds need to be issued, and governments must pay those interest costs. If doubts arise about their willingness to pay, inflation expectations start rising too.

The Ukrainians are currently having some success pressuring the Russian economy by hitting oil refineries, oil storage, and other targets that push up petrol prices. Russian petrol prices have risen 40% this year. Petrol rationing has been introduced in many parts of Russia. We’re seeing images from Russia of kilometre-long queues because of rationing. It’s hitting the Russian economy.

There are probably quite a few Russians who are thoroughly fed up with this. We’re talking about Russian losses on the front over the past three years approaching a million men dead or wounded. So it’s not certain the war is quite as popular as some might wish. Perhaps someone would like to remove Putin. And let’s say that happens, and there’s a positive regime change in Russia. The geopolitical situation would change immediately, and perhaps we could reduce our fear that we need to spend 3-4-5% of GDP on defence. That picture changes if we’re facing a different Russia.

The Tech Concentration Risk

If we look at how the global equity market is constructed, somewhere between 70 and 80 percent of the global equity market – perhaps even more – consists of American shares. And a very large portion of that is just six or seven tech shares that dominate to an enormous degree.

So in reality, when you think you’re buying the whole world, you’re perhaps getting massive exposure to Nvidia, for example, or Tesla, or Microsoft. You’re exposing yourself enormously to American technology shares. And then you haven’t spread your risk—you think you have, but you haven’t really done so.

If these shares are overvalued – and it’s my personal opinion that they appear to be – then you haven’t spread your risk. You’ve actually taken on relatively high risk.

Let me give you an example of the timing problem. If we look at the situation in 1998 and examine the American stock market, we can see that American technology shares were extremely expensive at some point. If we look forward five years, we can see that was correct, and technology shares actually fell significantly during that period.

But here’s the problem: we need to find indicators that get us in and out of markets at the right time. I’ve done this exercise many times. Could we find indicators, such as price-earnings ratios—the share price relative to company earnings? Could we say that if price-earnings rises above a certain level, we should sell, and when it falls below another level, we should buy?

If we do this in connection with the tech bubble in the late 1990s, you’ll see it’s nearly impossible to find an indicator that would have got you out of the market at the right time and back in at the right time in real-time. The problem is that most indicators were already telling you to leave the market from 1995-1996. But if you left the market then, you’d have missed the entire upswing, and you’d be sitting there waiting for the market to come back down to where you started.

The best would be to stay in the market, even though it’s become too expensive, and then exit at the top. But if you don’t have an indicator for that, it’s useless. And so whilst I can sit here and say I think tech shares are really, really expensive now, and they’ve become very concentrated, that makes it very difficult to act on.

Governance as an Investment Strategy

When I talk about governance, it’s really about what we want when there’s uncertainty—trust. Something we can rely on. Perhaps in 2018 or 2019 or 2020, Russian shares looked very attractive. They were cheap, and there were some good stories. But there was also a dictator in Russia. A dictator who could suddenly just invade a neighbouring country and essentially confiscate all businesses. Hardly anyone would want to have invested in Russian shares today.

This governance theme has been really important in recent years. Countries where there’s respect for property rights, where there’s press freedom, where there’s a low level of corruption, where agreements are honoured, where the legal system ensures agreements are honoured—these are countries that have performed relatively better than those where we think, “Hmm, perhaps there’ll be a military dictatorship tomorrow, or the military dictator might confiscate some businesses.”

We can think of countries like Turkey, Russia, China. We’ve seen very clearly that this theme has dominated the pricing of Chinese shares. President Xi might decide to confiscate a business or introduce capital controls. And some of the things we’ve talked about regarding Donald Trump—that’s what we could broadly call governance. Because Donald Trump has said, “I didn’t write the rulebook. It doesn’t apply to me.” And something happens there.

Donald Trump constantly tests these checks and balances. He’s done it in trade, with the central bank, with defence, with states’ autonomy. He’s sent the National Guard into various states. He constantly tests this. And something we’ve talked about in various forms—whether we believe in these checks and balances—that there’s no problem, he can’t do anything. But he tests it. And he tests it extensively.

The countries that score highly on governance include lovely, peaceful, beautiful Denmark. If we look at various measures of economic and political freedom, all the Nordic countries, but especially Denmark, score very highly on economic freedom. We have relatively low levels of regulation, which might surprise some people. We have well-protected property rights. What pulls us down when we talk about economic freedom is that we have high tax levels in Denmark. But overall, we have relatively unregulated product markets, relatively unregulated labour markets.

Other countries could be Ireland, Singapore, Switzerland, the Netherlands—they typically score highly on these measures. These are countries where we’d also feel safe if we flew there. We won’t just be arrested on the street for nothing. That’s a large part of European countries, but not all of them.

There are also countries that have clearly moved in the right direction. If we look at all countries in Central and Eastern Europe, 35-36 years ago we had communist dictatorships in Poland, in the Baltics, for example. And we must say they’ve moved enormously regarding these governance questions, becoming free, democratic nations with respect for property rights.

If we look at emerging markets over the past five years, it’s been very clear that the emerging markets with most respect for institutions, property rights, contractual freedom, and free trade are the ones that have performed well. That could be Poland, the Baltics. But countries that have moved away from this—Russia, China, Turkey—have taken proper beatings in the stock market.

Chile and Uruguay are countries in the emerging markets world that belong at the top of the class. Botswana is interesting—I believe Botswana gained independence in 1966 and has been a democracy since independence. It’s actually the only country in Africa that can boast of this. It’s had enormous economic and political stability, democracy, and well-protected property rights. It’s a fantastic success story that we don’t talk much about.

The All-Weather Portfolio

What we need to consider is what’s sometimes called an all-weather portfolio – an investment portfolio that performs well in different weather conditions. When the economy is doing well, when it’s doing poorly, when there’s inflation, deflation, stable inflation, high growth, volatile growth. How do you manage?

It’s about spreading risk, of course. It’s also about having shares or assets that can handle these scenarios. My encouragement to investors sitting out there having made really good money on their shares would be: perhaps you should sit down and say you haven’t spread your risk. You thought you had because you just bought the S&P 500 index. But now you’ve become enormously exposed to basically five or eight American tech shares.

Perhaps you should reduce that exposure, buy some bonds, buy some commodities. It could be gold. It could be gold mining shares. It could be different types of bonds. It could be focusing on inflation risk—buying inflation-indexed bonds to remove some of that inflation risk. Spread the risk.

Saying “I have five different shares” isn’t enough if you’ve bought five different shares within the same sector—you haven’t spread the risk. You need different countries, different assets, bonds, shares. In reality, what you should do if you’re sitting there thinking you’re a bit worried things have become expensive, or you’re considering spreading risk, is to spread it across many more assets.

For the average Dane (or anybody else globally), the most significant exposure in their portfolio is the property or flat they own. It’s interesting that whilst we sit here with drones over Copenhagen, uncertainty, trade wars, and all sorts of things worrying us, Copenhagen property prices are up 20% over the past year. That tells a story about how the property market and stock market are insurance – partial insurance – against high inflation.

Where it’s not insurance is if central banks do something about inflation. If they say inflation is rising too much and we need to kill it by raising interest rates sharply, then the property market dies, the stock market dies. So we can’t just say we shouldn’t worry and should buy shares and bonds. What I’m trying to say is that when we start getting high inflation expectations, some of these markets begin to behave differently than we’re used to.

My Final Message: Don’t Panic, But Do Check Your Risk

My main message is: don’t panic. Use these crisis considerations to sit down calmly. Whether you’re an institutional investor, pension fund, or individual investor, sit down and ask: how am I actually exposed? Have I really achieved the risk diversification I think I have?

Because there are people who don’t need risk diversification. But sit down and do a crisis check, a risk diversification check on your portfolio. Don’t do anything desperate. Don’t think you know which crisis share or weapons share will rise. Don’t try to beat the market, but sit down and consider whether you have the risk diversification you think you have.

If you think you’ve spread your risk by just buying a global equity index, my message is: you haven’t spread your risk. You might feel like you have, and it’s actually performed really well. But this crisis might be a good reason to take that check. And don’t rush it. You never get anything good from that.

I’d like to be in a situation where I’d want to buy weapons shares because I’m worried—yes, there’s that too. I’m probably in the worried camp relative to how the market is. But if I’m constructing a portfolio, I need to create one where I don’t constantly have to time things correctly.

If your portfolio has risen 30% annually for the past three years, perhaps it might be good to spread some risk, get some bonds, get some commodities. That’s not investment advice in the sense that I don’t know what individuals have as exposure. I don’t know individual private economics, but this is what economic and financial theory textbooks say: spread your risk, consider the correlation between assets.

Sometimes you think, “I’m in this and I’m in that—they’re completely different things.” But if you see that nine out of ten days these two assets move in the same direction, you’ve essentially bought the same thing. So consider that. I think this is a healthy opportunity to do a reality check on your portfolio.

This article is based on the latest episode (“Investering i en krisetid) of my podcast “Makropuls” (in Danish). See links to the podcast here (Spotify and Apple podcast). The podcast is produced in cooperation with Howden Denmark.





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