A backup battery provides power to a system when the primary source of power is unavailable. Backup batteries range from small single cells to retain clock time and date in computers, up to large battery room facilities that power uninterruptible power supply systems for large data centers. Small backup batteries may be primary cells; rechargeable...
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http://en.wikipedia.org/wiki/Backup_battery
The backup battery maintains system configuration, date, and time information in the CMOS (q.v.) chip when the system is turned off. Portable computers also have an additional battery to permit independent operation.
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http://www.encyclo.co.uk/visitor-contributions.php
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