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If I leave the battery for a long time, does it shorten its life?

If I leave the battery for a long time, does it shorten its life?

Q: If I remove the battery and leave it for a long time, will the battery life be shortened?

Answer: This is a very simple and difficult question. In general, in the case of many rechargeable batteries, if left unused for a long period of time, the performance of the battery will deteriorate. There may be various causes, but over-discharging mainly due to self-discharge of the battery may lead to deterioration of battery performance and shortened lifespan.

From the standpoint of self-discharge rate, the lithium-ion battery you inquired was most often used in existing portable devices, and has a very low self-discharge rate than Ni/Cd, NiMH, and lead acid batteries that are still used in low-cost products. For example, NiMH is 15%/month, whereas lithium-ion batteries differ depending on the active material constituting the (+.-) electrode, but about 3~5%/month, which has excellent long-term storage characteristics. Therefore, if left unused for long periods of time, lithium-ion batteries are considered to be the least affected among the batteries mentioned above.

And if you have to leave it unused for a long time, it is better to store it in a charged state rather than in a discharged state. That way, the probability of overdischarging and causing fatal damage to the battery will be low even after several months.

Incidentally, lithium-ion batteries were developed relatively recently and succeeded in commercialization for the first time in the world by Sony of Japan from the spring of 1992, and were shipped to the market in Korea around the end of 1995 and early 1996. As it was adopted, it was introduced to the public in earnest. Therefore, it can be said that it is still unfamiliar to the general public.

The reason that lithium-ion batteries are expensive compared to existing Ni/Cd or NiMH batteries is expensive because the materials used are scarce in view of the reserves of materials that exist on Earth. This is because the electrolyte used is not an aqueous solution, but an expensive organic electrolyte and a lithium salt (about hundreds of thousands of won per kg) that is expensive enough to pop out the eyes. Nevertheless, the use of lithium-ion batteries in the 3C industry such as mobile communication terminals, notebook computers, and camcorders is about three times the capacity of Nicard and 1.5~2 times that of nickel hydrogen (exactly, nickel-hydrogen storage alloy) at the same volume and weight. And the battery life is about twice as long, and there is no memory effect, so users can use it for a long time without knowing the characteristics of the battery.

In fact, it is not easy to use Ni/Cd batteries for more than one year in mobile communication terminals, but lithium-ion batteries have been used since 95, but there is hardly any word that the battery has been changed after the end of its life. (Is that so? Of course, if the charger is used incorrectly, the lifespan is shortened, or during normal use other than for other reasons...) So, even though it is expensive, it becomes a licorice of a drugstore in high-end equipment.

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