The C200HBAT09 is a backup battery designed for Omron's C200Hα series Programmable Logic Controllers. Its primary function is to provide power failure backup, holding the contents of the HR, AR, CNT, DM, and EM memory areas, as well as the Real-Time Clock (RTC). This battery offers a service life of five years under normal operating temperatures of 25°C (77°F), though this may be shortened at higher temperatures. It is a critical component for maintaining data integrity and ensuring quick system recovery after a power loss in industrial control environments.