“Mobile phone batteries should be recharged after running out”, “overcharged batteries will explode”… For a long time, there have been different opinions about charging, and some misconceptions about charging often confuse people. So, how can we charge correctly, not only ensure safety, but also extend the service life of the battery?
myth 1: a new battery needs several full charges and discharges to activate
Different battery products need different methods to charge, and must be used according to the product instructions. Early nickel cadmium batteries and nickel hydrogen batteries required similar “activation”. These batteries will produce a “memory effect”, which is easy to overcharge the batteries when they are charged in a state of incomplete discharge, and users will feel that the electricity will run out soon after a long time.
However, most of the batteries used in mobile phones and notebook computers are lithium-ion batteries. Its initialization process has been completed at the time of manufacture, so it does not need to be activated when it is used.
Myth 2: reducing the number of charges can prolong the battery life
Generally, the life of lithium-ion batteries can reach hundreds of charge and discharge cycles. Here, the charge and discharge cycle refers to the process of recharging after the power is used up, rather than plugging in the charger and unplugging it once. Lithium batteries have no memory effect and can be charged at any time. Deliberately recharging the battery after it is used up in order to reduce the number of charging times does not extend the battery life, but has a negative impact on the battery life.
In addition, if the mobile phone uses automatic shutdown, the internal voltage of the lithium battery will be too low due to excessive discharge, and it may not be able to start and charge. Therefore, lithium battery charging pays attention to “eating less and eating more”, and frequent shallow charging and discharging are more conducive to extending its life.
myth 3: overcharging will cause battery explosion
Lithium batteries generally have safety protection circuits and a variety of safety devices to ensure that the battery circuit is automatically cut off in case of overcharge, discharge and short circuit; Too high internal pressure of the battery will also trigger the exhaust device to reduce pressure; If the battery temperature is too high, the hot melt protection device will be triggered to stop the electrochemical reaction of the battery.
Therefore, unless there is a quality problem, the battery will not explode because it is plugged in for a long time. However, if the power supply is not unplugged after full charge, the battery will remain fully charged. Although it will not explode, it will speed up the loss of battery capacity.
In addition, it is rumored that answering the phone while charging the mobile phone will cause an explosion. Experts said that this argument is untenable. If there is such a danger, the product will set a program not to connect to the phone when charging. However, from the perspective of health, the wire will limit the user’s range of activity. Receiving and making calls while charging may keep the user fixed in one place for a long time, resulting in excessive muscle tension. Therefore, it is recommended to unplug the power supply before talking. When charging, do not cover the battery with anything and do not put it on the bed to avoid fire.
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