Secret phone use error: battery overcharge will not explode

Secret phone use error: battery overcharge will not explode

The author is a phone porridge person, often can chat with friends to talk to the phone automatically shut down, but a friend reminded me to call when the phone is low, the radiation is 1000 times the usual, very harmful to the body. However, some friends said that the mobile phone signal and power are not related. These are rumors, no scientific basis, and not credible. So who is right? Today, the author collected some rumors from the use of mobile phones to crack information, and popularize some mobile phone use knowledge.

A cell phone, a thousand times more radiation?

I believe that many friends in different places have the habit of calling porridge, and often even talk about the automatic shutdown of the phone, but there are rumors on the Internet that when the phone is weak, the radiation is 1000 times when the battery is fully charged. Is it terrible? But is this rumor true?

Everyone knows that mobile phones transmit and receive voice and data information through electromagnetic waves. Information is transmitted between different mobile phones through the base station. The signal coverage of each base station is limited, so the signal strength will be different in different areas. Different. When the signal strength is weak, the mobile phone will increase the radiation intensity to accept more signals. Therefore, the radiation intensity of the mobile phone is related to the signal strength, and not related to the power.

Cell phone radiation tester

Since the radiation of the mobile phone is related to the signal, if the signal is weak, will the radiation intensity of the mobile phone reach 1000 times of normal? This is possible.

Taking the GSM mobile phone as an example, when operating at 1800MHz, when the signal is weak, its maximum peak power can reach 1W, and in the state of full signal, the minimum power is 1mW, the difference is exactly 1000 times, so this statement is It has some basis.

Radiation peak of a mobile phone

Although the radiation can be up to 1000 times different, you should not worry too much. After all, it is only the ideal value to compare with the highest value and the lowest value. In actual use, it is difficult to reach this peak. Even if the radiation reaches the highest value, it is only 1W, or within the national standard, it has little effect on health.

Although cell phone radiation has little impact on health, it is not without harm. For the sake of insurance, it is recommended that you try not to make a phone call in a weak place for a long time. When you make a call, try to use headphones to minimize the risk of radiation from your phone.

Will cell phone radiation cause cancer?

There have been rumors on the Internet that cell phone radiation can induce cancer. The source of this rumor is actually based on a news article, "The World Health Organization recognizes that cell phone radiation may cause cancer."

Although this news is true, it is only the result of some people taking it out of context. In fact, this rumor misses a lot of important information. For example, WHO's “probable cancer list” includes 266 radiation sources and chemicals, such as pesticides, gasoline and even coffee. Items identified as carcinogenic to humans are classified as Class A carcinogens, including: smoke, alcohol, and barbecue. Cell phone radiation is only classified as a Class B carcinogen, which may be carcinogenic to humans. Therefore, mobile phone radiation is very low on human carcinogenicity, so you can use it with confidence.

Newly bought mobile phone, is the battery activated?

I believe that everyone has encountered this situation. When buying a mobile phone, the waiter will remind you in good faith that the mobile phone must use up the power, then charge it for more than 12 hours, and repeat the full charge discharge three times or more. Otherwise, the battery The power cannot reach the maximum capacity.

In fact, this problem was more common a few years ago, and many people have now come out of this misunderstanding. However, most of the original committees did not understand, and today I will explain to you in detail.

Nickel-metal hydride rechargeable battery

Earlier, there were some rechargeable batteries that required similar "activation" work. This is the early use of nickel-cadmium rechargeable batteries and nickel-metal hydride rechargeable batteries. These batteries produce a phenomenon called "memory effect", which is charged in an incompletely discharged state, which tends to overcharge the battery. Over time, it will cause proliferating crystals on the electrode plate and block the contact between the electrolyte and the electrode plate. As a result, the voltage of the battery drops, allowing the user to feel that the battery is quickly used up. For both types of batteries, recharging after fully discharging the battery periodically (rather than each time) can alleviate the voltage drop caused by the above reasons.

Lithium-ion battery in mobile phones

However, the batteries used on our mobile phones are mostly lithium-ion batteries. Lithium-ion batteries do not need to be activated by deep charge and discharge when they are used, because the battery initialization and testing process is already done when the battery is manufactured. Lithium-ion batteries also have no so-called "memory effect" and can be charged at any time. It is recommended that the lithium-ion battery be fully charged and discharged on a regular basis, just to calibrate the power detection device on laptops and some high-end smartphones, not because of the benefits of the battery itself. For ordinary mobile phones and digital cameras, the devices that display the approximate power of the battery are completely unnecessary to be fully charged and discharged periodically.

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