Excessive temperature is a key factor in premature battery wear.
Car charging is the perfect storm when it comes to overheating.
You can still charge in the car, but you have to take some precautions.
I’ve been tracking the battery health of my daily driver iPhones for so long now that it’s practically second nature. It’s like a weird hobby/habit that I’ve picked up. Every few days since I got my iPhone 17 Pro Max, I’ve been firing up the Settings app and taking a look at my battery stats. I’m particularly curious because, with this handset, I decided to throw caution (and Apple’s battery care tips) to the wind.
Why? Well, I followed all the rules with my last iPhone. I turned on Optimized Battery Charging, was careful not to keep the phone on charge for hours on end, and even did my best to keep it cool. Despite doing all this, the battery barely lasted two years before it became so bad it was frustrating to use, and a handset I’d planned on keeping for three years got replaced after only two.
So, this time around I stopped caring. No charge limitation, no fancy optimizations. I just threw it on whatever charger or used any power bank that was close to hand.
There was one thing I changed.
The car charging dilemma
I spend quite a bit of time in cars. And putting my phone on charge is just as much of a ritual as putting on my seatbelt.
But here’s something that I’ve noticed has become an increasing problem, especially over the past few years. No matter how I charge my phone, whether it’s wired, wireless in a dock, or using the car’s built-in charging pad, my phone always gets hot. And I don’t just mean a little warm, I mean hot.
Cars are an odd thing. In summer they’re like a greenhouse on wheels, and in winter we’re pouring heat into them to warm them up. And that cooling and heating is aimed at keeping the humans comfortable. The phone is normally on the dash, in the window, in front of a vent, or in a crevice.
It’s a tough life for a phone.
The dreaded “Charging on Hold” message.
Adrian Kingsley-Hughes/ZDNET
Something else that I noticed was that the only time I have ever seen my iPhone enter “Charging on Hold” mode (a mode where it pauses charging in order to cool down) is when it’s on charge in the car. I’ve not seen this happen when it’s attached to a power bank, or when it’s charging on my nightstand.
The iPhone (and iPad, iPod, and Apple Watch) all operate best at 32° to 95° F (0° to 35° C), and the company warns that it is “especially important to avoid exposing your device to ambient temperatures higher than 95° F (35° C), which can permanently damage battery capacity.”
Adrian Kingsley-Hughes/ZDNET
The interior of a car can easily get to the point where it’s bad for batteries (and humans!) very fast. Here’s a calculator based on a Stanford University School of Medicine study. Even on a mild 70°F (21°C) day, the interior of a car can hit 104°F (40°C) in just 30 minutes and 113°F (45°C) after an hour. Bump the temperature to 75°F (24°C), and the internal temperature will break 118°F (48°C) in an hour. And a Texas summer high of 98°F (37°C) will push the interior temperature to a sweltering 123°F (52°C) in half an hour.
Batteries are going to die — you can’t change the laws of physics — but you can give them a fighting chance. Apple itself warns that high temperatures can permanently reduce battery capacity (this is why iPhones go into a “Charging on Hold” mode when things get too hot).
So, I decided to stop charging my phone in the car altogether. Well, almost. I’ll get to the exception in a moment.
The results so far
This one small change seems to be making an appreciable difference. My iPhone is currently at 196 recharge cycles, and the battery health is still at 100%. That’s impressive, considering Apple claims newer iPhone batteries are designed to retain up to 80% of their original capacity after 1,000 full charge cycles.
Back in February, I wrote about how amazed I was that my phone had hit 122 recharge cycles without dropping to 99% battery health. Now, at 216 days old and almost 200 cycles, I’m even more impressed. It’s almost like my iPhone is defying the laws of battery physics — it’s not, it’s just proof that listening to the science and avoiding heat really does help.
The exceptions
Now, I’d be lying if I said I never charge my phone in the car anymore. Sometimes, life happens, and I need a quick top-up while I’m on the move. But when I do, I take a few precautions. I make sure to keep the phone out of direct sunlight and away from the heater. I’ll even do my best to position my phone near an air vent with the AC on if it’s a particularly hot day.
Also, I’ve replaced all my in-car chargers with ones that make use of thermoelectric cooling to actively cool the iPhone while it’s charging (more information on thermoelectric coolers here).
Adrian Kingsley-Hughes/ZDNET
None of this is perfect, but I’m not perfect either, so it’s a compromise that I’m happy to live with.
What about those built-in charging pads?
Bottom line, they’re awful.
My iPhone wouldn’t fit into this wireless charging pad (a 2026 Vauxhall Mokka).
Adrian Kingsley-Hughes/ZDNET
Partly this is down to the fact that my iPhone 17 Pro Max is too big to fit most charging pads, and because I have it in a big, thick case, but also because they’re just so poorly designed most phones — especially ones that have a “camera bump” — don’t interface with the charger well enough.
I rent a lot of vehicles for travel, and I always try the charging pad if there’s one available, and I can’t think of one I’ve had that, in the words of the late Apple CEO Steve Jobs, “just works.” They seem to work better with a smaller handset, but even then the experience is far from great.
Do you ever wake up in the morning still feeling exhausted, causing you to wonder if you truly got a good night’s sleep? You may then go about your day feeling just as tired as you were the night before. Getting enough sleep every night is extremely important for your body’s overall health and is just as important as eating well, exercising regularly, and staying hydrated. Without adequate rest, your physical and mental health will suffer, as sleep impacts your mood, energy levels, and even your body’s immune system.
Unfortunately, there is no one-size-fits-all formula for how much sleep a person needs to feel well-rested, as various factors play into the amount required for optimal health. However, some guidelines are available to help you achieve better sleep. Keep reading to discover how much sleep you really need and some practical tips to improve your sleep quality.
Why Sleep Is Essential for Your Health
Sleep is a vital part of both physical and mental health as well as everyday life. In fact, Reproductive Biology and Endocrinology reports that the average person will spend a third of their life sleeping. Take a look at how sleep affects all aspects of health.
Mental and Cognitive Health
Good quality sleep plays a role in many functions of the body that affect mental and cognitive health. For example, proper sleep helps support healthy brain functions, allowing you to concentrate on your daily tasks while giving you the mental clarity to do so. It also improves the way nerve cells communicate with each other. The opposite is also true – when your body lacks sleep, focus and response time slow down, and the brain is unable to build or retain memories.
Physical Health
Getting the proper amount of sleep also plays a part in physical health. In fact, according to the CDC, studies have shown that a lack of sleep can impact the immune system in a variety of ways, which can later lead to the development of certain disorders. Individuals experiencing inadequate sleep are more likely to get sick, as fewer natural immune cells are produced. The CDC found that approximately 72% of immune cells are produced during a full night of sleep, but those with less sleep produced well below this quota.
Sufficient sleep also impacts the body’s hormonal balance as it is released following the individual’s circadian rhythm or the sleep-wake cycle. Women can experience greater disturbances in sleep because of hormonal changes, such as during a menstrual cycle, pregnancy, or menopause. Insufficient sleep can affect the levels of the estrogen and progesterone hormones while also slowing down the thyroid and impeding metabolism. Finally, losing sleep can also increase the production of inflammatory cytokines, which can lead to cardiovascular and metabolic issues.
As you can see, hormone imbalances caused by inadequate sleep can negatively affect your health. When this occurs, hormone replacement therapy may be necessary.
How Much Sleep Do I Need?
If your constant sleepiness is beginning to affect your physical and mental health, it’s time to begin determining how much sleep you truly need. While there is no one sleep schedule that fits everyone’s needs, as sleep needs can vary depending on many factors, following the guidelines for your age group may help you feel more rested.
Here are the most current sleep recommendations by age:
Newborns (0-3 months) – For the first three months of life, newborns need between 14-17 hours of sleep throughout the day, as they do not typically sleep through the night.
Infants (4-12 months) – Between four and twelve months of age, an infant requires 12 to 16 hours of sleep. This usually includes daytime naps.
Children (1-12 years) – Toddlers and children require between 9-14 hours of sleep during the night and may sometimes need daytime naps.
Teens (13-18 years) – As children become teenagers, they don’t need as many hours of sleep, and between 8-10 hours per night is sufficient.
Adults (18-64 years) – The recommended number of hours of sleep needed each night for adults is between 7 and 9 hours.
Seniors (65+ years) – Sleep is essential to aging gracefully, especially for women. Getting 7-8 hours per night is recommended.
While these amounts are the general recommendations for each age group, every person’s needs will vary. In fact, the number of hours required may evolve and change within these age brackets, depending on current conditions. For example, young children may need more sleep when going through a growth spurt, while older children may need more sleep if they are experiencing hormonal changes. Pregnant women often need more rest, especially when experiencing disruptions in their ability to sleep at night.
Other factors that can impact your need for sleep include your current lifestyle. For example, if you have a particularly busy lifestyle, you may find yourself becoming exhausted during the day even if you do achieve the recommended hours of sleep. Additionally, high stress levels caused by family, work, health, and other factors may leave you feeling tired and in need of more rest.
Signs You’re Not Getting Enough Sleep
Feeling sleepy can be normal as an occasional occurrence after a night of little sleep, but it’s important to watch for signs of sleep deprivation. Even if you seem to be able to function normally on a regular basis while achieving less sleep than recommended, you can still experience negative side effects.
Some of the most common signs that you’re habitually not getting sufficient rest include:
Chronic fatigue
Irritability
Trouble focusing and staying alert
Frequent illness due to a weakened immune system
Sudden weight gain
Increased blood pressure
If you continue to experience insufficient or poor-quality sleep, the above signs can eventually result in long-term issues. The most common issues resulting from the long-term effects of inadequate sleep involve chronic conditions like heart disease and diabetes. Poor sleep can also impact your mental health, resulting in depression. The cognitive impacts of poor sleep mentioned above may leave you with difficulty concentrating on important tasks, which can have dangerous consequences.
Why Should Women Prioritize Healthy Sleep?
According to a study published in Sleep Medicine, women are more likely to experience trouble sleeping and have a higher risk of developing sleep issues such as insomnia. Women are also more likely to struggle with poor-quality sleep, especially when they are experiencing hormonal changes. In addition, a woman going through extreme changes in their hormones due to pregnancy may have even more trouble sleeping due to feeling uncomfortable or frequently waking to urinate. Menopause may also disrupt sleep, as it can cause night sweats or hot flashes.
Unfortunately, for women, poor sleep can be a vicious cycle. Insufficient sleep can disrupt hormone production, as the release of hormones is affected by the circadian rhythm. It may also impact the menstrual cycle by disrupting the hormones used to help regulate sleep, such as melatonin.
How to Improve Your Sleep Quality
There are many ways to achieve better rest and have better health as a result. Below are some tips on how to improve sleep quality.
Stick to a Sleep Schedule
First, it is important to create an optimal sleep schedule. Keep in mind that when you are trying to implement a new habit, consistency is key, so make sure that your new schedule is one that you can follow every night. Start with your desired wake-up time, determine how many hours are ideal for a person your age, and work backward from there. Then, set your bedtime about half an hour before that to give yourself time to wind down and complete your sleep routine.
Develop a Sleep Routine
Determine what will help you to relax and unwind, preparing yourself mentally and physically for sleep. Many women choose to promote relaxation by practicing certain techniques, such as yoga or meditation, before bed, but simply making an effort to empty their mind of any anxieties can be enough.
Consider adding these relaxing activities earlier in the evening to help you release stress before bed:
Journaling before bedtime
Drinking a cup of herbal tea
Reading a book or watching a relaxing television show
Listening to instrumental music
Avoid Nighttime Habits That Worsen Sleep
In addition to partaking in relaxing activities before bed, it’s important to avoid activities or habits that can negatively affect your sleep. Before preparing for bed, make sure to avoid eating heavy meals, as they can keep you awake. Similarly, caffeine and alcohol can disrupt your ability to sleep. Finally, consider disconnecting from social media and ongoing text conversations in the hour leading up to bedtime.
Optimize Your Sleep Environment
Optimizing your sleep environment means that you are creating an environment that promotes sleep. The room should be dark without any distracting lights, which includes ensuring all television screens and smartphones are turned off. Keep the room cool so that you won’t wake up due to feeling too hot or sweating throughout the night. Ensure that you create a peaceful and quiet space, free of any loud or persistent noises; however, for some people, a sleep machine or some kind of white noise, such as a fan, can be soothing.
Address Your Hormones
Remember that hormonal imbalances are a major cause of sleep disturbances. Two primary hormones that have a large impact on your quality of sleep are progesterone and estrogen. These hormone levels can vary widely due to the menstrual cycle, pregnancy, perimenopause, and menopause. If you are looking to regulate your hormone levels, consider seeking treatment from Arizona Gynecology Consultants.
When to Seek Help for Sleep Problems
In many cases, sleep issues can be resolved by implementing a better sleep schedule or trying relaxation techniques before bed, but certain sleep problems require the help of a medical professional.
Common sleep disorders, such as insomnia, sleep apnea, and restless leg syndrome (RLS), typically require medical attention to resolve.
Insomnia – This sleep disorder is marked by difficulty achieving sleep. Chronic insomnia can cause trouble performing normal tasks and mental health issues, and the NHS reports that approximately 1 in 3 adults experience this common condition.
Sleep Apnea – This disorder occurs when a person frequently stops breathing while sleeping, which typically results from blocked airways or the brain failing to control the breathing process properly. Without treatment, the heart can begin to show potentially deadly signs of stress.
Restless Leg Syndrome (RLS) – This disorder is characterized by extreme urges to move the legs while trying to rest, which can make it difficult to fall asleep or stay asleep. Those who suffer from this condition usually feel itching, crawling, or throbbing sensations in the legs, which can be temporarily resolved by moving.
If you know you are experiencing any of the above disorders, it’s crucial to seek medical attention to address them and get a doctor’s help with working toward better sleep.
If you’re unsure whether you need medical assistance, look for the following warning signs that your sleep issues cannot be addressed on your own:
Constant fatigue, even if you have slept a sufficient amount of time the night before
Difficulty staying awake while performing daily tasks, such as driving or reading
Memory issues or trouble concentrating
Waking up frequently in an attempt to regain your breath
In addition, hormone issues may be affecting the quality or quantity of your sleep. If you suspect that a hormone imbalance is causing your sleep disturbances, it is important to consult with a doctor to explore hormone regulation for better quality sleep. Schedule a consultation with Arizona Gynecology Consultants to explore solutions.
Achieve Better Quality Sleep with the Help of Arizona Gynecology Consultants
Getting good quality sleep is vital for your overall health and is as essential as getting enough food and water. For most people, achieving better sleep is possible when you implement healthy sleep schedules, engage in relaxing habits while eliminating those that can cause poor sleep, and ensure that you create an environment that promotes rest rather than distractions. However, for others, these efforts are not enough to achieve healthy sleep patterns.
It’s important to monitor any concerning symptoms that may indicate a sleep disorder. Avoid ignoring warning signs, as continued poor sleep can result in more serious health issues. If you’re experiencing poor sleep that isn’t remedied by better sleep habits, be sure to notify your physician.
Are you struggling to get good quality sleep each night? Don’t let chronic sleep issues and the resulting fatigue or physical and mental health effects continue to negatively impact your life. Contact Arizona Gynecology Consultants to schedule a consultation and develop personalized solutions to improve your sleep and overall health.
*Editor’s Note: This article was originally published May 9, 2017 and has been updated April 24, 2025.
Parthasarathy, S., Vasquez, M. M., Halonen, M., Bootzin, R., Quan, S. F., Martinez, F. D., & Guerra, S. (2012). Persistent insomnia is associated with mortality risk. Sleep, 35(5), 585–592. https://doi.org/10.1016/j.sleep.2012.01.011
Zhou, E. S., Haack, M., Nguyen, J., & Mullington, J. M. (2022). The impact of sleep on mental and physical health. Journal of Clinical Sleep Medicine, 18(2), 509–520. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8764829/
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