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EM1500 User’s Manual
85
A.5 The Backup Battery
A replaceable 950 mA·h lithium battery provides power to the real-time clock and SRAM when external
power falls below 2.93 V or is removed from the circuit board. The drain on the battery is less than 10 µA
when there is no external power applied to the EM1500, and so the expected shelf life of the battery is more
than
The drain on the battery is typically less than 4 µA when external power
is
applied, and so the expected
battery in-service life is
A.5.1 Replacing the Backup Battery
To replace the battery, first remove the old one. The battery snaps in and out of place, so just apply pres-
sure under its rim to get it out. Use a Renata CR2477N (or equivalent) replacement battery. Insert it with
the + side facing up.
Obviously, the SRAM contents and the real-time clock settings will be lost if the battery is removed with
no external power applied to the EM1500.
CAUTION:
There is an explosion danger if the battery is short-circuited, recharged, or
replaced incorrectly. Replace the battery only with the same type or an equivalent type rec-
ommended by the battery manufacturer. Dispose of used batteries according to the battery
manufacturer’s instructions.
950 mA·h
10 µA
------------------------
10.8 years.
=
950 mA·h
4 µA
------------------------
27 years.
=
Summary of Contents for EM1500
Page 14: ...10 www rabbit com Introduction...
Page 22: ...18 www rabbit com Getting Started...
Page 76: ...72 www rabbit com EM1500 Configuration...
Page 90: ...86 www rabbit com EM1500 Specifications...
Page 104: ...100 www rabbit com Serial and TCP Protocols...
Page 118: ...114 www rabbit com EM1500 FAQ...