18650 rechargeable battery lithium 3.7v 3500mah

Analysis and research on the misunderstandings of 18650 rechargeable battery lithium 3.7v 3500mah discharge

The more a 18650 rechargeable battery lithium 3.7v 3500mah is discharged, the greater the battery loss will be. Tom Hartley, an electrical engineering professor at the University of Akron who helps NASA study extending battery life, said that the more fully the battery is charged, the greater the battery loss will be. Lithium batteries are best in an intermediate state of charge, so that the battery life is the longest.

First of all, too high and too low power states have the most adverse effects on the life of lithium batteries, while the number of charge and discharge cycles is secondary. In fact, the number of rechargeable times marked on most electrical appliances or batteries sold is based on a test with 80% discharge as the benchmark. Experiments show that for some laptop lithium batteries, if the battery voltage is often allowed to exceed the standard voltage by 0.1 volt, that is, from 4.1 volts to 4.2 volts, the battery life will be halved, and if it is increased by 0.1 volt, the life will be reduced to one-third of the original; long-term low or no power state will make the resistance to the movement of electrons inside the battery greater and greater, thus causing the battery capacity to decrease. NASA sets the battery consumption of its Hubble Space Telescope at 10% of the total capacity to ensure that the battery can be repeatedly charged and discharged 100,000 times without having to be updated.

Secondly, temperature also has a great impact on the life of lithium batteries (this point can be ignored for mobile phones and other small electronic devices). An environment below freezing may cause lithium batteries to burn out the moment the electronic product is turned on, while an overheated environment will reduce the battery capacity. Therefore, if the laptop is used with an external power supply for a long time without removing the battery, the battery will be in the high heat discharged by the laptop for a long time. More importantly, the battery will soon be scrapped if it is in a 100% power state for a long time.

From the above, we can summarize the following points to ensure the capacity and life of lithium batteries:

Currently, most electronic products use lithium batteries. Since the advent of lithium-ion batteries in 1990, they have developed rapidly due to their excellent performance and have been widely used in society. 18650 rechargeable battery lithium 3.7v 3500mah manufacturers have also achieved the largest scale of development. There is no need to charge lithium batteries to 100% full, let alone use up all the power. When circumstances permit, try to keep the battery charge near half full, and the smaller the charging and discharging amplitude, the better.

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