Replacing The Real-Time Clock Battery - NEC EXPRESS5800/120Md Series User Manual

Replacing the Real-time Clock Battery

You may need to replace the real-time clock (RTC) battery because of its
battery life span. The battery powers the clock in the absence of power. When
the battery starts to weaken, it loses voltage, and the system settings stored in
CMOS RAM (for example, the date and time) may be wrong.
The battery (Vendor Part No. CR2450) is available through many vendors. It is
located on your system board (see Figure 4-14). Notice the plus (+) sign on the
battery. The sign assists in correctly positioning the battery on the system board.
Contact your sales representative or dealer for a list of approved devices.
Figure 4-14. Location of the Real-Time Clock Battery
Danger of explosion if the battery is incorrectly replaced.
Replace only with same or equivalent type recommended by
manufacturer. Dispose of lithium batteries as required by
local ordinance or as normal waste if no local ordinance
exists. Do not expose the component to excessive heat or
fire. Keep all batteries away from children.
! CAUTION
Upgrading Your System 4-23