Using polymer batteries, let’s talk about some experience. If there is something wrong, please point it out. In the use of polymer batteries, there are mainly several problems:

　　Maintenance tips 1. What is the charge cycle (or called the charge and discharge cycle)?

　　Many people think that the life of a polymer battery is the number of charging cycles, but it is actually wrong. Strictly speaking, it should be called a charging cycle. A complete charging cycle is to charge 100% of the electricity, and then discharge 100% of the electricity. The life of a lithium battery is about 300-500 complete charging cycles. The correct statement about the life of lithium batteries should be 300-500 full charge and discharge.

　　In other words, suppose a battery is 100% full: 50% is used and 30% is charged. This is not a complete cycle. A complete cycle is charged and discharged with two 100% cycles. This is actually a 40% cycle. Used 60% to charge

　　40%, then there is a 90% cycle. And so on...

　　Lithium batteries have no memory effect, so I agree with Apple's proposal that the use of lithium batteries should be, use some, charge some, don't charge for too long, and don't need to be exhausted. To charge the battery, it is best to use a small current to charge, generally 0.5C-2C charging, small current is less irritating, and can better maintain the battery. 3. Avoid overcharging and overdischarging. Generally, the charge cut-off voltage is set to: 4.25V, and the discharge cut-off voltage is about 3.0V. The discharge cut-off voltage should be determined according to the actual situation, such as playing violence 3D, then the discharge cut-off The voltage is best set at about 3.4V, below this value, it is easy to cause the entire battery pack to be over-discharged due to instantaneous over-discharge. Avoid full storage. When not in use for a long time, the lithium battery should be taken out and placed in a cool and dry place. Do not freeze to avoid water vapor erosion. Avoid using it in a hot car. For long-term storage, charge the battery to 40% and store it, or store the voltage between 3.75 and 3.85V.

　　Maintenance experience two, whether to open USB charging

　　Now more and more devices support USB charging. I personally feel that it’s okay if I can’t turn it on, for the above reasons. But with USB charging, I saw a friend post saying that it was not full of charging because of insufficient voltage (PDA has never encountered it, it can be fully charged, I don't know why 580 can't), I also encountered the same situation. From a habit, I still don’t want to charge for a while every time I plug in the USB. This is mainly a matter of habit, so I turn off the USB charging myself. If you don’t have a power supply, you can turn it on again to charge it, which is convenient anyway. At the same time, I don't know if charging the mobile phone under non-standard voltage will affect the mobile phone and the battery. Without knowing the exact situation, individuals tend to turn off the USB charging as much as possible.

　　Maintenance experience three, what to do without lithium battery

　　The self-discharge rate of lithium polymer battery is still a bit high. To be on the safe side, if you don’t use it, it’s best to charge it first, and then store it in a plastic bag. It should be used once every 1-2 months, that is, charge and discharge once to keep the lithium ion active. Do not exceed 3 months at the longest, and be sure to take it out and charge it once. If it is stored for too long and not used, the lithium ion activity will decrease, which will affect the battery life.