"The mobile phone battery should be recharged after it has been used up." "Overcharged battery will explode"... For a long time, there have been many opinions about charging, and some charging misunderstandings often make people confused. So, how can we properly charge, both to ensure safety and to extend the life of the battery?
Myth 1: The new battery needs several full charge and discharge to activate.
Different battery products require different methods to charge, and must be used according to the product instructions. Early nickel-cadmium and nickel-hydrogen batteries required similar "activation." These batteries produce a "memory effect" that can be charged in an incompletely discharged state, which can easily overcharge the battery. Over time, the user feels that the power is running out quickly.
However, the batteries used in current mobile phones and laptops are mostly lithium-ion batteries. Its initialization process is done at the time of manufacture, so no activation is required when starting to use.
Myth 2: Reducing the number of times of charging can extend battery life.
Generally, the life of a lithium-ion battery can reach several hundred charge-discharge cycles. The charge-discharge cycle here refers to the process of charging the battery after it is used up, instead of plugging in the charger and then unplugging it once. Lithium batteries have no memory effect and can be recharged at any time. In order to reduce the number of times of charging, the battery is depleted and then fully charged. This does not extend the battery life, but has a negative impact on the battery life.
In addition, if the mobile phone uses an automatic shutdown, the lithium battery may be too low due to excessive discharge, and the battery may not be turned on and charged. Therefore, lithium battery charging pays attention to "less meals", frequent shallow charge and discharge is more helpful to extend its life.
Myth #3: Overcharging can cause the battery to explode.
Lithium batteries generally have safety protection circuits and a variety of safety devices to ensure that the battery circuit is automatically cut off during overcharge, discharge and short circuit; excessive internal pressure of the battery will trigger the decompression of the exhaust device; if the battery temperature is too high, it will trigger heat. The protective device is melted to stop the electrochemical reaction of the battery.
Therefore, unless there is a quality problem, the battery will not explode due to long-term charging. However, not fully unplugging the power supply after the battery is fully charged will keep the battery fully charged. Although it will not explode, it will speed up the loss of battery capacity.
In addition, there are rumors that the phone will cause an explosion when the phone is charging. Experts say that this argument is untenable. If there is such a danger, the product will set up a program that does not access the phone when charging. However, from a health point of view, the wire will limit the user's range of motion. When charging, the phone may be fixed in one place for a long time, causing excessive muscle tension. Therefore, it is recommended to unplug the power and then talk. Do not cover anything on the battery when charging, and do not put it on the bed to avoid fire.
(Editor: Xu Xiaoyu)
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