How to use cell phone battery correctly

The editor once heard someone say that the first few times when using the phone that you just bought, you must first fully charge it, and then drain it out, and repeat it several times, so that the battery can be activated and the battery life will be longer.

When I heard this, I was immediately messed up in the wind. This is to make lithium-ion batteries have a long life, obviously it is to make lithium-ion batteries short-lived. If you set time back twenty years, this statement is not a big problem. Because it is a nickel-metal hydride battery, it has the so-called "memory effect", that is, the crystals on the nickel plate will become coarse after the battery is left for a long time, which affects the contact with the electrolyte, resulting in a decrease in capacity [3]. Performing several full charges and discharges can refine the crystal grains and partially restore the capacity, which is called "activation".

Ni-MH battery | Source: Wikipedia

And now mobile phones have already used lithium-ion batteries. As mentioned earlier, lithium-ion batteries are based on the insertion and extraction of lithium ions in the intercalation compound, and there is no "memory effect". So just use the mobile phone you just bought.

Someone asked that the cycle life of a lithium-ion battery is only about 500 times, so how can the life of a lithium-ion battery be extended?

The cycle life of a lithium-ion battery is generally defined as the number of cycles that the lithium-ion battery can maintain above 80% of its capacity when it is deeply charged and discharged. Two keywords can be seen from here: deep charge and discharge and 80%. Deep charging and discharging can easily destroy the microstructure in the lithium-ion battery and reduce the capacity. But our mobile phone has a protection mechanism, and it is impossible to charge and discharge the battery deeply. You have to use the special equipment of the battery factory. Secondly, the capacity of the lithium ion battery below 80% does not mean that it cannot be used, but It will make users feel that the battery is not durable.

If the lithium-ion battery has a lifespan of 500 times when tested in the factory, then the lifespan we usually use must be greater than 500 times. Because we can't charge and discharge the battery deeply in normal use, the battery capacity decline is not so severe. As for how to make the lithium-ion battery last longer, what we can do is not to charge and discharge the battery deeply (of course, to avoid overcharging and over-discharging), that is, to charge and discharge the lithium-ion battery shallowly: use it when it is not fully charged. , Charge before the battery is completely discharged. But doing it this way really affects the fun of playing with the phone, so there is a more compromise solution: use the phone after it is fully charged, and charge it when there is 20% of the battery left. Don't wait until the phone is automatically turned off. Why is it 20%? Because my mobile phone will enter the power-saving mode when the battery is 20%, I have obsessive-compulsive disorder, and I can’t wait to recharge the phone at this time.

Phone battery phobia

In fact, our engineers with bad usage habits have long considered it, and don’t need to worry about it by yourself (True. I am smarter than the engineer series). The mobile phone battery can still be used for two or three years under normal use. After two or three years, the mobile phone should almost be replaced. Up.