The cRIO-905x contains a lithium cell battery that stores the system clock information when the cRIO-905x is powered off.
There is only a slight drain on the battery when power is applied to the cRIO-905x power connector. The rate at which the battery drains when power is disconnected depends on the ambient storage temperature. For longer battery life, store the cRIO-905x at a cooler temperature and apply power to the power connector. Refer to the specifications in the Models section or on ni.com/manuals for the expected battery lifetime.
The battery is not user-replaceable. If you need to replace the battery, contact NI. Refer to the specifications in the Models section or on ni.com/manuals for information about battery disposal.