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Lithium batteries labeled as 3.7V or 4.2V are one thing. It's just that the manufacturer's labeling is different. 3.7V refers to the platform voltage at which the battery is discharged during use, while 4.2V refers to the voltage at full charge. The common rechargeable 18650 lithium batteries have a voltage of 3.6 or 3.7V, and when fully charged, it is 4.2V, which has little to do with the battery capacity. 18650 batteries range from 1200mah to 4000mah, and 3.7V refers to the lowest voltage when the battery is fully charged.
It is generally believed that setting the no-load voltage of a lithium battery to 3.7V is considered to be fully charged. When discharging a lithium battery, the no-load voltage should not be set below 3.7V, otherwise it will damage the battery. 4.2V is the highest limiting voltage for battery charging. It is generally believed that charging the no-load voltage of a lithium battery to 4.2V is considered to be fully charged. During the battery charging process, the voltage gradually increases from 3.7V to 4.2V. When charging a lithium battery, the no-load voltage cannot be charged above 4.2V, otherwise it will also damage the battery.
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