How can lithium batteries live longer

As long as the lithium battery is overcharged and short-circuited, it can live a long life. The no-load voltage of the lithium battery can be used as a reference for the storage capacity. The voltage of each battery after 100% overflow is 4.2V (4.1V in some cases). As long as the battery ends rise to this voltage, the charging will stop; each lithium battery The lower limit voltage of the battery is 2.5V. As long as the battery ends down to this voltage, the discharge must be stopped; if the battery is discharged to only 2V, it should be charged with a small current to 2.5V before normal charging; the large charging current generally does not exceed 1C (Cu003d current of battery capacity ampere/hour, for example: 1.35A current of 1.35Ah battery), the protection circuit of lithium battery is roughly designed according to such use characteristics. There are many special protection circuits for lithium batteries of the finished walkie-talkie, but I think it is too complicated and has not been used. I still use an old-fashioned M-Mark 8400 mobile phone, which can be used as a test bench for lithium batteries in addition to its very good call quality. This mobile phone will automatically shut down when the battery voltage is as low as 5V, so there is no need to worry about battery over-discharge. However, this electric tiger consumes electricity and consumes 50mA at rest and 200mA for calls. I used two 18650P lithium batteries without a protection circuit in series to form a 7.2V use. Generally, they do not shut down for 24 hours, and they have to be charged every day (not on time). No capacity drop has been found for a year. I made two chargers: one is a switching power supply, the voltage is adjusted to 8.4V, the large current limit is adjusted to 1.4A; the other is a 12V power supply connected to a 7809 three-terminal regulator, and a 7809 output terminal is connected in series with a 0.7V Voltage drop diode. The charging time can be unlimited, but it will usually overflow within an hour or two. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to control the consistency of lithium batteries