Now many people will go to the mobile phone street to buy some mobile phone battery chargers of a few yuan or a dozen yuan, but many chargers have poor charging performance, and finally cause battery drums, and the capacity is reduced. The main reason is that the control of the constant voltage charging voltage of some inferior chargers is not accurate enough. The biggest shortcoming of lithium batteries is that they cannot be over-discharged and over-charged, and the charging set-off voltage is too high, which is the main reason for overcharging. The charging circuit can control the charging cut-off voltage within the safe range of 4.16V-4.18V by adjusting the resistance of the "*" by several hundred ohms. Although this voltage range may cause a slight undercharge, it can ensure the battery is safely charged and extends the battery life.
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Sensen Group Co., Ltd.  , https://www.sunsunaquariums.com