With the development of the Internet of Things, single-chip microcomputer + lithium battery, this combination is becoming more and more common, single-chip microcomputer manufacturers also continue to introduce single-chip microcomputer suitable for the Internet of things. First add the basic knowledge of lithium batteries... When fully charged, the lithium battery is 4.2V; When the power is used up, it is not 0V, but about 2.7V, and the lithium battery made by each manufacturer has a slight difference. In view of the limitations of lithium battery materials, voltages exceeding 4.2V will cause dangers, such as combustion; Voltage below 2.7V or so, will cause no recharging, in short... Lithium battery voltage is too high and too low, will cause permanent damage, so... When using lithium batteries, our products need to monitor the lithium battery voltage at all times. When charging, do not exceed 4.2V, this requirement needs to be added to the product

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