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Is it better to fully charge the phone battery at once or to charge it 80%? Most of the mobile phones we currently use use lithium batteries, which were developed by Sony over 20 years ago. At that time, it was quite expensive, and everyone used batteries made of other materials. Before the popularization of lithium batteries, different battery materials were used, such as nickel batteries, which had a memory effect. If the battery is not fully charged, it is still considered a charging cycle. Repeated charging can lead to rapid loss of battery life. According to the characteristics of lithium batteries, they should be charged and discharged between 20% and 80%, with the longest battery life! Less than 20% of batteries have over discharge, and over 80% of rechargeable lithium batteries have significant losses! Rechargeable batteries have a long lifespan due to shallow charging and discharging. If they are always charged and discharged between 30% -60%, their lifespan will be very long! The method of recharging at 0% is prone to battery failure, and the practice of constantly charging around 100% is often obsessive-compulsive. The battery aging is extremely fast! Others can use their batteries for 3 years, but this method often requires replacing the batteries within 1 year!

But one benefit of lithium batteries is that they do not have a memory effect. If you unplug it after charging to 60%, it will not consider it as a charging cycle. The entire battery must complete one cycle before forming a charging and discharging cycle. This means that lithium batteries can be charged and unplugged at any time without worrying about this issue. Moreover, high-quality lithium batteries have high safety, specific capacity, and self discharge rate. When used in production, the lifespan of the battery is relatively long. It should be noted that most mobile phone batteries nowadays are lithium batteries. Lithium batteries have a very loud slogan of "charge as you go, charge as you go", which means they can be charged at any time without causing any damage to the battery, and there is no need to be limited to being fully charged every time. Because lithium batteries are counted as a cycle based on 100% usage rather than charging capacity. For example, if I use 40 batteries this time and continue to charge 30%, then the next time I use 60 batteries, it will be counted as a cycle. It has little to do with your current battery level.

To charge, there are electrolysis and reduction. I have opened a lithium battery and studied it. Inside, there are three thin layers of brownish red powder coated on folded capacitor paper. The damp aqueous solution inside is the electrolyte. Because lithium ions are harmful to humans, the battery is very sealed. Lithium ion batteries are all constructed with three layers, with higher mAh increasing the dosage. However, the standard voltage for each layer is fixed at 1.2V, and these three layers are 3.7V, with a sufficient charge of standard 4V. Lithium batteries have this physical characteristic, charging them is an electrolysis reaction, and using electricity is a reduction reaction. As long as there is a certain amount of electricity, it will not damage the battery due to the size of the electricity. I have a fully charged battery that fell into the corner of the cabinet, and after three years, it still measures 3.8V, so storing it with sufficient charge has both advantages and disadvantages. Each lithium battery has at least three copper contacts at the top, which are connected to the three springs of the phone. The charger enters the phone with a voltage of approximately 5V, and the internal voltage stabilizing circuit of the phone ensures that the 4.2V input is protected by the protective circuit on the battery. The integrated circuit on the battery is stabilized to a voltage of approximately 4V input. As long as the circuit on the battery is not damaged by high voltage and high temperature, the battery will always be stable and safe.

Charge if possible: Nowadays, mobile phones are all lithium-ion batteries without memory function. Don't wait until the phone is almost out of battery before charging. If you put it completely out of battery before charging, it will actually damage the chemical activity inside lithium-ion batteries. The suboptimal battery range for smartphones is between 45% and 75%. Although it is not realistic to keep the battery level within this range, at least you need to know what the ideal state is. If the suboptimal battery range cannot be achieved, then keep it between 20% -80%, and charging within this range will cause the least damage to the battery. Don't charge to 100%. Research shows that batteries, like humans, don't want to be under pressure and don't always expect them to be too full. In fact, charging from any battery level to 100% is not a good idea, as it can actually cause high voltage damage to the battery. Lithium batteries do not need to be fully charged, so it is not necessary to do so. It is recommended to charge the battery 98% -99% before it is fully charged

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