Need some battery life tips? These are the facts and habits you need to maximize your phone battery’s longevity.
Most of us — casual users and enthusiasts alike — are forever searching for smartphones with the longest battery life. And while fast charging keeps us topped up every day, the absence of replaceable batteries means eventually, the lithium-ion cells enclosed in our phones are going to age and deteriorate, making it harder to maximize battery life.
If you’ve held onto a phone for a couple of years, you’ve probably noticed the battery doesn’t seem to last as long as it did when your handset was brand new. Four or five years down the line, many phones struggle to make it through the day on a single charge. Holding onto a phone even longer can even spell trouble for reliability too as you may face sudden shutdowns.
Unfortunately, battery capacity inevitably declines with age. But that doesn’t mean you can’t do anything to prolong the lifespan of your smartphone’s battery. If you’ve ever wondered what the best way to charge your battery is, here are some scientifically proven tips to maximize battery life.
If you’re in a hurry, here’s a quick summary of the best battery life-maximizing tips you should keep in mind:
Avoid full charge cycles (0-100%) and overnight charging. Instead, top up your phone more regularly with partial charges.Limiting your smartphone’s maximum charge to 80-90% is better for the battery’s health than topping up to completely full every time.Use fast charging technologies sparingly and when your device is cool.Heat has the potential to accelerate battery health degradation. Don’t cover your phone when charging, and keep it out of warmer places.Don’t play intensive games, stream videos, or run other intensive workloads while charging to avoid heat and stressing the battery.Keep reading for a more detailed explanation of what factors will prolong your battery life
Partial charging is a healthy habitGoogle Pixel Stand wireless charging Galaxy S21 UltraOne particularly persistent battery myth is that you need to occasionally fully discharge and recharge to erase “battery memory.” This couldn’t be more wrong for lithium-ion batteries. It’s a leftover myth from lead-acid cells, and it’s pretty undesirable to charge your modern smartphone in this way.
Partial charging is just fine for lithium-ion batteries and can have some positive benefits for cell longevity. To understand why it’s important to appreciate how a battery charges. Li-ion batteries draw constant current and operate at a lower voltage when closer to empty. This voltage gradually increases as the cell charges up, leveling off at around a 70% charge before the current begins to fall until the capacity is full.
Partial charging is just fine for lithium-ion batteries and even has some positive benefits
.Notably, operating at a low voltage is good for a battery’s lifespan, increasing the number of available charging cycles before you’ll start to see a significant reduction in capacity. Roughly speaking, every 0.1V decrease in cell voltage doubles the cycle life, according to Battery University. Therefore, charging up your phone in that 30% to 80% range keeps the voltage lower and might slightly prolong the battery’s lifespan.
Avoid idle chargingGoogle Pixel 7a charging plug and wireless dockCharging overnight or in a cradle during the day is a very common habit, but it’s not recommended for several reasons (the old “overcharging” myth isn’t one of them). First, continuous trickle charging of a full battery can cause plating of the metallic lithium, which reduces stability in the long term and can, in rare cases, lead to system-wide malfunctions and reboots. Secondly, as we just mentioned above, it leaves the battery at a higher stress voltage when at 100%. , and most important, it creates excess heat caused by wasted power dissipation.
Some phones disable or slow down charging when nearing full capacity.Ideally, a device should stop charging when it reaches 100% battery capacity, only turning the charging circuit back on to top up the battery now and again — or at the very least reducing the charging current to very small amounts.
While some phones disable charging once full, many continue to pull up to half an amp and sometimes more from the wall outlet. Turning smartphones off doesn’t make a difference in many cases either. While this isn’t a massive amount of power, it’s going to stop your phone from cooling down as quickly and will continue to cycle through a small part of the battery, resulting in a mini-cycle.
A charging dongle shows the amount of current passing to a fully charged smartphoneAt 100 percent charge, this phone still draws 200mA to keep the battery topped up.
A charging dongle shows the amount of current passing to a fully charged smartphoneUsing the phone increases the current draw, inducing a mini cycle in the battery.A final point worth mentioning is parasitic load. This occurs when the battery is being drained significantly at the same time as being charged, such as watching a video or gaming while charging.
Parasitic loads are bad for batteries because they distort the charging cycle and induce mini-cycles — where part of the battery continues cycles and deteriorates faster than the rest of the cell. Voltage stress and heat on the battery.
Gaming or videos while watching charging is bad because it distorts charging cycles.The best way to avoid parasitic loads is to turn your device off while charging. But that’s not really realistic. Instead, it’s best to keep the workload light while the device is plugged in, leaving it idle most of the time. Browsing the web is probably fine. Also, remember to unplug it once the battery is topped up enough.
Heat is the enemy of long battery lifeASUS ROG Phone 5 product shot of the battery and charging logos up closeAlong with all of the above, temperature is an equally key contributor to longevity and maximizing battery life. In fact, it’s arguably the biggest killer of long-term battery health. Like high voltages, high temperatures stress the battery and make it lose capacity far more quickly than when kept at lower temperatures.
A cell kept between 25 – 40 degrees Celsius (77 – 86 degrees Fahrenheit) should retain around 85% to 96% of its capacity after the first year with sensible charging cycles. Raising the temperature regularly above 40°C (104°F) and charging to 100% sees this fall to just 65% capacity after the first year, and a 60°C (140°F) battery temperature will hit this marker in as little as three months.
The ideal temperature to maximize battery cycle life is below 40°CA battery dwelling in a full state-of-charge exposed to a high temperature is the worst of all worlds and the number one thing to avoid when charging your phone. So no leaving your phone under your pillow to charge at night or plugged in on the dashboard of your car on a hot day. And if you use it, wireless charging can impact battery health if you don’t keep the phone cool.
Fast charging technologies are a contentious issue here, as the higher current and voltages lead to a hotter device. With capabilities exceeding 60W and pushing to 100W even in smartphones, device longevity quickly becomes an issue. Fast charging is fine for a small top-up , but numerous standards we’ve tested regularly exceed 40°C when charging for more than a few minutes. As you can see in the graph below.
Leaving your phone to fast charge up for 5 to 15 minutes won’t lead to major overheating problems, but I certainly don’t recommend using them for a full charge. Instead, you’d be better off using a temperature-aware fast charging solution or switching to a slower charger, especially if you plan to plug your phone in overnight.
How to maximize smartphone battery health long-termmotorola edge plus charging indicatorLithium-ion battery technology is well understood these days, and smartphones are built around our use cases, but bad habits and myths still permeate the public consciousness.
While most of these habits won’t severely negatively impact your phone’s battery life in the medium term , the decline in removable phone batteries means we should take extra precautions to maximize battery life and thus our smartphone’s longevity.
Broadly speaking, smaller regular charge cycles and keeping your phone cool are the key things to remember. Although I should point out that different phone batteries will always age differently depending on how we treat them.