Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 283 / 510

Coral IPx Office Installation Manual Common Control Cards
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A new lithium battery can maintain power to the MCB Office memory circuitry and
real-time clock for approximately 90 days. The battery is
not recharged by the system
power. Thus, if the battery has powered the memory and real-time clock for an
extended period and is almost discharged, the contents of the memory must be backed
up, and the battery must be replaced.
The battery voltage, tested under load, can be used to determine its state of charge.
Voltage measured across an unused battery connected to the memory circuitry should
fall between 3.30 and 3.35 volts. If the voltage measured across a battery is less than
2.50 volts, the battery must be replaced.
Replacing the Lithium Battery
In the following procedure, do not apply too much pressure to the battery clasp as this
could cause it to break.
1. Turn off the battery switch.
2. Carefully raise the battery clasp.
3. Insert the new battery with the + (positive) symbol appearing on top.
4. Turn on the battery switch.
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7 Lithium Battery Condition Testing
Do not use any metal tool to release or insert the battery. Doing so could result in a
short circuit and damage the battery.
Explosion and Environmental Hazards.
There is a danger of explosion if the battery is replaced incorrectly.
Replace the battery only with the same or equivalent type recommended by the
manufacturer.
Dispose of used batteries according to requirements specified by the battery
manufacturer and/or local regulatory agencies.