Smartphones continue to upgrade, with screen sizes and hardware performance constantly improving, but battery life has failed to see a significant leap forward. While other component technologies are developing rapidly, battery technology has lagged behind, falling far behind. As a result, battery life has become one of the most troublesome issues for users in their daily smartphone use.
Here are some common misconceptions you should avoid about mobile phone batteries and charging.
There have always been many conflicting opinions about smartphone battery charging, and some common misconceptions often leave people confused. You've probably heard claims that leaving your smartphone plugged in overnight while you sleep will damage the battery, and there are many similar claims. To help you use your phone more safely and effectively, let's take a look at some common misconceptions about smartphone batteries and charging.
1. What exactly is fast charging technology?
Qualcomm fast charging method
Current mobile phone fast charging technologies can be divided into two categories: those that increase current and those that increase voltage. The general idea behind increasing current is to thicken the charging cable, or expand the charging cable from a standard 4 or 5 pins to 7 pins, etc. This thicker charging circuitry reduces resistance and increases current. Increasing voltage can be understood as boosting the voltage at the charging head, then reducing it at the phone's integrated circuit before it is input to the battery. In short, the essence of fast charging technology is to maximize the voltage or current reaching the battery under certain constraints (such as safety), thereby increasing the input power.
2. Will charging the battery overnight damage it?
Charge your phone at night
Charging a phone overnight may result in repeated charging, and repeatedly putting the phone in a constant voltage charging state will reduce battery life. However, modern smartphones stop charging once fully charged and only resume charging when the battery level drops below a certain voltage. And since the battery level usually decreases very slowly in standby mode, even charging overnight won't frequently trigger recharging. However, it's worth noting that while charging overnight won't damage the battery directly, it will significantly reduce battery life in the long run. Therefore, to extend your phone's lifespan, try to avoid charging overnight.
3. Is it really good to use your phone while charging?
Playing games on your phone while charging
You might think that using your phone while charging will negatively impact the charging circuitry or battery. Actually, many modern phones have circuit management, meaning they draw power directly from the charger. Even without circuit management, drawing power directly from the battery shouldn't cause any problems. However, considering temperature, the CPU and screen heat up when using your phone, and the battery also heats up when charging; the combined heat can cause the phone to reach a higher temperature than when playing games or charging alone. Therefore, when using your phone while charging, pay attention to whether it overheats. If it does, it's recommended to take conservative measures to cool it down.
4. Should mobile phone batteries be completely discharged and then fully charged periodically to maintain their lifespan?
Do not completely drain your phone battery and then fully recharge it periodically.
Many users believe that phone batteries need to be "trained" to reach their maximum charge level, so they periodically discharge and recharge them completely. They also believe it's best to plug in the charger when the battery is above 80%. However, this is incorrect. Modern smartphones use lithium-ion batteries without memory effect; they can be charged even at 80%. Users can charge whenever they want without worrying about the remaining charge level.
5. Can third-party battery management software actually help extend battery life?
It's fair to say that third-party battery management software has no impact on battery life. While these task management programs may allow or block some tasks, they don't significantly improve battery life compared to the built-in system. You might want third-party applications to better manage other applications, but don't expect them to extend battery life.
6. Is it unsafe to use third-party batteries or chargers?
iPhone 4s using a third-party battery
To ensure no unexpected situations arise, mobile phone manufacturers usually recommend that users purchase original accessories. However, many users buy manufacturer-certified third-party accessories after their original chargers break. In actual use, there is no difference, and no safety or functional issues arise. Only unbranded, cheap counterfeit batteries or chargers may cause safety malfunctions during use; therefore, it is recommended that everyone use original or third-party chargers/batteries whenever possible.
7. Is it safe to use your phone while it's charging?
Using your phone while charging generally does not pose any safety issues.
While there have been cases of accidents caused by using mobile phones while charging, these are not actually problems with the phone or battery technology. Such incidents typically occur when using a charging phone in a pool or bathtub, or when using a cheap, unreliable counterfeit charger. Genuine phones and chargers have current protection measures, and their maximum voltage is far below the maximum voltage the human body can withstand. However, when using your phone while charging, you should still consider the phone's temperature; if it gets too hot, you should stop using it.
8. Will using a mobile phone in low-temperature environments extend battery life?
Using a mobile phone in low-temperature environments will shorten battery life.
Some users try to extend their phone's battery life by using it in low-temperature environments, but this is actually incorrect. Not only does it not extend battery life, it can also negatively impact battery life. This is because lithium-ion batteries are susceptible to adverse effects from both heat and cold; for smartphone batteries, room temperature is the optimal temperature.
9. How many full charge-discharge cycles are needed to activate a smartphone battery?
Do not activate smartphone batteries
Early nickel-cadmium and nickel-metal hydride batteries required similar activation. These batteries exhibited a memory effect, and charging them in an incompletely discharged state could easily lead to overcharging. However, modern mobile phones use lithium-ion batteries, whose initialization process is completed during manufacturing, so activation is not required when starting use.
10. I've heard that reducing the number of charging cycles can extend battery life?
The lifespan of a lithium-ion battery is not related to the number of charging cycles.
Previously, it was widely believed that lithium ions in lithium-ion batteries would lose their vitality with each charge, leading to the end of the battery's lifespan. However, Apple explained that the lifespan of a lithium-ion battery depends on the number of charge cycles, not the number of cycles. A typical lithium-ion battery can last for several hundred charge-discharge cycles. Here, a charge-discharge cycle refers to the process of completely depleting the battery and then fully recharging it, not simply plugging in and unplugging the charger.
In conclusion
The above points address some common misconceptions users may have about smartphone batteries and charging. Based on the degradation mechanism of lithium-ion batteries, I offer the following optimal battery usage habit: keep your phone's battery level between 30% and 50%, and fully charge it to 100% before leaving home. This reduces the time the battery is left idle at high power levels (for example, a 100% battery left for a month will experience greater capacity degradation than a 50% battery left for a month). Of course, this strategy may not be very practical for most current smartphone users, so it's for reference only.
