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Is fast charging harmful to your phone? – Gadgets To Use


Fast Charging is very common in our times, as modern phones now come with 30W, 45W, 50W, 65W charging. Business doesn’t end there, even 100W, 120W are there too, and recently Xiaomi unveiled its “200W HyperCharge Technology”, which is said to charge a 4000mAh battery in just 8 minutes! It’s some crazy fast speed (not as much as Flash though!).

Every time a new faster charge comes out, a few questions come to mind like “Is this fast charge harmful to our phones?”, “Is this high current safe for our phones?” etc. I am here to answer these questions and resolve this once and for all. So let’s get started.

Also, Read | Xiaomi Mi Air Charging Technology Explained: How Does It Work and Is It Harmful?

Different Charging Standards

There are various charging standards available such as:

  • Quick Charge from Qualcomm
  • Pump Express from Mediatek
  • Send USB Power from USB Group
  • Proprietary Charging Solution from Individual Brands such as Oneplus, Oppo, Huawei, etc.

Also, Read | 9 Tips to Charge Your Phone Faster With or Without a Fast Charger

How does Fast Charge work?

There are several things involved for faster charging in phones, such as the amount of charge a battery can take, dedicated regulatory circuits, and sometimes even a chip, changes in the design of the battery, and so on.

How much charge can a battery take?

The standard charge rate a lithium-ion cell can assume is 5 Volts, the exact number is quoted on the battery (if you’re curious to know). Now, different charging standards use different Voltage (V) and Current (I) combinations to compensate for the Recharging Power in Watts, as mentioned in the table below.

Voltage (V) Current (I) Power (V x I)
Regular Power Adapter 5V 2A 10W
Samsung 15W 9V 1.67A 15W
Samsung 25W 9V 2.77A 25W
Upload VOOC 4.0 / WARP 5V 6A 30W
Quick Charge 3.0 12V 3A 36W
super VOOC 10V 5A 50W
Super VOOC 2.0 / WARP 65 10V 6.5A 65W
Fast Charge 4.0 / 4+ / 5 20V 5A 100W
120W Live Flash Charger 20V 6A 120W

Also, Read | [Working Explained] Super VOOC, Pump Express, Charge Warp, Turbo Power – Which is Better?

Charging Circuit

There are two different ways that fast charging is implemented by different smartphone brands, both of which have one thing in common, namely, there is a circuit and a chip used to manage the electrical current. This circuit regulates and provides a high intensity charge to quickly charge the battery up to 70-80%, and now for the remaining 20-30% the slow charge is provided to maintain the battery life. This is possible because of the Lithium-ion batteries used in phones, as such batteries can easily absorb high current.

Along with this, since few charging technologies provide high voltage to the battery, this circuit reduces the high voltage current to 5V, and to maintain power, it also increases the current supply. This process generates a lot of heat, which is added to the heat already generated by the battery charge.

  • Some brands put this circuit in the phone so that all the current management is done on board. This method generates the above mentioned heat on the phone itself.
  • While some brands like Oneplus, Oppo, Realme, Vivo, Huawei, etc. Put this circuit in the power adapter, then the actual management is done on the power supply. This will heat up the power adapter keeping the phone a little cooler by a few degrees.

Battery Cell Design

It is not safe to supply high current to any electronic equipment or any battery. You should have heard of someone, to turn off electrical appliances in case of current. That’s because it can damage the battery or even blow up the phone. That is why in the second fast charging method, a dual cell battery is used. The high voltage from the power adapter is divided into two and transferred simultaneously to the two cells. Resulting in a lower voltage per cell while still charging your phone faster.

For example, suppose a 4000mAh battery is made up of 2 cells of 2,000mAh each, and a current of 65W is transmitted to the battery in two spits, i.e. 32.5W per cell. This way both cells will not be stressed by a high current, and since both cells are charged at the same time your phone will charge faster.

Why don’t we use more than 2 cells?

Logically we can use multiple cells in one phone to further increase the charging speed. But it’s not the technically correct approach, because when two cells are combined together, then it’s the capacity of the battery that’s affected. Due to the limited space in a phone, if we use more cells then the battery capacity will be drastically reduced, compared to a single cell battery that can be inserted in that same space.

How will it affect the battery life cycle?

What is a battery life cycle? Every electrical product comes with a lifespan, after which it stops working and needs to be replaced, it is due to wear and tear. In the case of the battery, we measure it by “battery life cycle,” usually a lithium-ion battery can last for 400-500 charge cycles. This means that you can charge from 0-100% 400-500 times, if you connect it for a fast recharge of 50% (e.g., from 20-70%) then it will not be counted as a complete 1 cycle, however, it will be the 0.5 cycle, and the next time you connect it, then the remaining 0.5 cycle will be completed (for the next 50%).

While a high power supply can certainly damage a battery as mentioned above, but phone manufacturers are aware of it and have cured it by using dual cell batteries. In addition, they use a combination of software and hardware technology to cut off the power when the battery is fully charged. Does that mean the battery is safe? Well not really, the heat generated while charging can also hinder the battery life cycle, and degrade performance over a long period of time because heat can change the chemical properties of the battery.

Some of our readers have shared that they have also observed battery degradation, and some have even stated that charging speeds have slowed down over time, so we’ve taken a few answers to be able to read their experiences.

Also, Read | Find out the Current, Charging Speed ​​of the Smartphone

Why do phones jump while charging?

The heat is the answer again, before we had phones with removable shoulders and batteries, which made room for the heat to dissipate easily. This is not the case with modern phones, which, in order to fit a larger battery and maintain a slim profile, all components are tightly packed together. The same thing is done with batteries, they are tightly packed in the body, and since we don’t have a screen or a removable battery, there isn’t nearly enough space to escape the heat. This is why while charging the phone it can heat up quite easily if proper care is not taken during charging.

How do you protect your phone from heating?

You can’t eliminate heating completely since it’s a general scientific fact that recharging a lithium-ion battery will generate heat, due to the Anode and Cathode in the battery, but you can follow some steps to reduce heating to a certain extent. measure.

Do not push the battery to extreme levels

It is recommended that you do not wait until your phone reaches 0% and then insert the charger, and remove it from charging only 100%. Both points put stress on your battery, which can degrade battery performance over time. The ideal point to insert the phone is around 20% and, it should be removed from the charge when it reaches 90-95%.

Do not recharge your phone

Although most modern phones come with software and hardware overload protection. However, it is recommended that you do not keep your phone plugged in after it is fully charged because the hardware protection may be damaged, over time due to wear and tear and accidental drops, and the software may also run into problems. it is very common.

Also, Read | 3 Ways to Protect Your Android Phone from Overload

Try to avoid hot environments

Experts say you should avoid recharging your phone when the ambient temperature is 86° F or 30 ° C, such a temperature can affect the health of the battery. You should charge your phone at room temperature, and avoid charging under the sun, on the dashboard, in a bag or purse, and so on.

Use Chargers and Cables of Good Quality and Certified

In case the original charger or cable that came with your phone is damaged or has been replaced, you can use third party chargers and cables, which are of good quality and come with suitable certifications.

Also, Read | 5 signs that you need to change the Smartphone charging cable

If you own a phone that uses proprietary charging technology, as in the case of Oneplus, Oppo, Vivo, Realme, IQOO, Huawei, Honor, etc., then you cannot use any third-party charger, because they use circuits. charging in your charger and not in the phone, as discussed above.

Do not perform heavy work while loading

When the phone is inserted into a charger, we should avoid doing heavy activities that use a lot of batteries, such as consuming media, playing games, recording videos, or editing photos or videos, and so on. Such activities can put stress on the battery and can confuse the battery management system in the phone, resulting in reduced performance over time.

Also, Read | Top 10 USB-C Multi-Port Chargers to Buy Now

Messing him up

So in this one-stop guide, we discuss different charging standards, how fast charging works, different fast charging modes, battery life cycle, how battery life is affected and how. protect the phone from heating. Let me know if you have any questions about fast charging, in the comments below.

Also, Read | Ways to Fix Charge Slowing in Android

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