It depends on the model of the CPU module, the amount of battery consumption, and the power-on time ratio.
Example) For Q06UDHCPU with power-on time ratio of 50%, the guaranteed value is 43,800 hours (5.00 years).
For more details, refer to the following manual.
- QCPU User's Manual (Hardware Design, Maintenance and Inspection) Appendix 4 Battery Life