November 20


What You Can and Can’t Do: Myths About Fast Phone Charging

Will your phone burn out if you leave it charging overnight? Can wireless charging ruin a smartphone battery? Let’s find out more about it and how to use it properly. Normal charging will power your phone to 100% on average in two hours, while fast charging will cope in 30-50 minutes, even if you are charging and playing at the Limewin Casino or watching TikTok at the same time.

What Fast Charging Is and How It Works

Battery capacity in smartphones is growing, and no one can be surprised by a 3500-4000 mA*h battery — even budget devices easily have a 5000 mA*h battery. But a large volume requires more time to restore energy. And the technology of fast charging appeared to speed up this process.

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These are averages because the speed of energy replenishment is directly dependent on the voltage and amperage supported by the power adapter. The latest fast charging technology can restore all the energy in just five minutes!


It works like this: a regular charger delivers 5 volts of voltage with a current of 2-2.5 amps to the device. With fast charging, higher values are used: the technique can support a current strength of 12 amperes at a voltage of 20 volts.


Such technology works thanks to special adapters and ports on devices that can support high voltages. Almost all modern gadgets have controller chips that help regulate the supply of electric current to the battery. An equally important link is the charging cable, which should also be capable of transferring a large amount of power.

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Using fast charging is convenient when you have little time to replenish the energy of the device. And it’s especially relevant, for example, before leaving for work or an important meeting.

Top Myths About Fast Charging

Improper Fast Charging Can Cause Your Phone to Burn up

Modern smartphones have controller chips that regulate the supply of electric current to the battery. When the phone goes to charge, the controller and power supply determine the acceptable intensity for fast charging.


When the battery is at its optimum charge (50% to 70%, it depends on the phone model), the voltage drops and the slow process of recharging begins. This is done to extend the life of the battery. It also avoids overheating — so you don’t have to worry about your phone burning up.

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You Can’t Leave Your Phone on Fast Charge Overnight

Nothing will happen to your smartphone. Modern gadgets have temperature sensors and special controllers: the latter supply energy to different parts of the battery. So, when charging and discharging, different parts of the battery are involved — the heat is dissipated.


In some phones, such as iPhone, Huawei and OnePlus, there is a function that tracks charging time and schedules it. If you regularly leave your phone charging overnight, the gadget realizes this and charges to about 80%, and shortly before shutting down, it will catch up the remaining percent of charge. Each manufacturer calls this function differently, but the principle of operation is approximately the same. You can sleep well and not worry about your smartphone.

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Fast Charging Ruins the Battery

Every device has a lifespan. Wear and tear will still occur over time, and it’s normal. So it’s not worth blaming fast charging for property damage.


Lithium-ion batteries themselves discharge faster over time, so manufacturers come up with different tricks to prolong battery life: increase their size, remove the charging circuit in the power supply, build two batteries at once or install a fan. Charger manufacturers are not lagging behind either. For example, TFN 2xUSB Type-C has protection against short circuits, network overloads, overheating and voltage spikes. On top of that, the charger has two USB Type-C output connectors. With this device you don’t have to worry about your smartphones.

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Wireless Fast Charging Also Harms the Battery

Wireless charging works like a simple transformer. There are two coils: one in the charger and one under the smartphone cover. And when AC current is applied to the first one, there is a magnetic field that acts on the second coil. The current is rectified and transmitted to the battery.


When wireless chargers first appeared, there was a slight danger of overheating the smartphone. But manufacturers quickly solved this potential problem by matching the power (just like conventional chargers). By lowering the wattage, they also reduced heating.

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