Prevent Reverse Charging of a Lithium Battery to Meet UL Safety Requirement Application Note 1535 Prevent Reverse Charging of a Lithium Battery to Meet UL Safety Requirement Introduction protection in the event that the internal MOSFET and series resisters should fail. Figure 2 shows the actual Lithium batteries are commonly used in many circuit with the external protection diode. (Note that a applications with devices requiring backup power, such as high value series resistor would provide similar Real Time Clock (RTC) ……