Charging voltage for 3.7v li-ion battery is the described voltage you should charge a li ion battery to last longer.lithium-ion batteries are made of two electrodes a positive one and a negative one. when you charge or discharge electrons are going outside the battery through the electrical current and ions are flowing from one electrode to ather.the capacity of a li-ion cell is measured in Ah or mAh wich means Amp per hour.the charging and discharging of the li ion battery is called C rate.voltage that reflects the state of the battery 2.7v is completely discharged and 4.2v is fully charged. You have to respect CCCV charging process.The capacity of the battery depends directly on the end of charge voltage.What voltage should I charge 3.7v lithium battery ?The simple answer is a voltage of 4.2v.
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