Appendix G. Lithium Coin Cell; Description; Replacement Procedure - Geokon LC-2x4 Instruction Manual

APPENDIX G. LITHIUM COIN CELL

G.1 Description
Under normal operating conditions, the 1.5-volt D cells provide all the power required to operate the LC-
2x4 datalogger. In order to maintain the correct date and time settings for those periods when the D cells
are removed, the LC-2x4 datalogger incorporates a 3-volt lithium coin cell (Panasonic CR2032) to
supply operating current to the internal Real Time Clock.
Since the power requirements of the Real Time Clock circuit are minimal (3µA max.), the clock will
continue to operate for up to 10 years under these conditions.
However, if the lithium cell voltage falls to 2.5-volts or less, it should be replaced using the following

replacement procedure.

G.2 Replacement Procedure
Materials Required:
• 6 mm (1/4") Slotted Screwdriver
• 6 mm (1/4") Nutdriver
• CR2032 Lithium Coin Cell (Geokon P/N BAT-115),
• Disposable Grounding Wrist Strap (3M P/N 2209 or equivalent)
Procedure:
1) Put on the disposable grounding wrist strap and connect to a good earth ground.
2) Using the 6 mm (1/4") slotted screwdriver, loosen the four captive screws and remove the datalogger
cover.
3) Remove the two D cells.
4) Using the 6 mm (1/4") slotted screwdriver, remove the four 9.5 mm long M3.5 x .6 (3/8" long, 6-32)
battery board mounting screws.
5) Lift up the battery board and disconnect the two-wire Molex connector (red and black wires) from
the main PCB, which is located below the battery board. Set the battery board aside.
6) Using the 6 mm (1/4") nut driver, remove the four standoffs securing the printed circuit board to the
case.
7) Lift the printed circuit board up to expose the bottom of the circuit board.
8) Using the 3 mm (1/8") slotted screwdriver, gently pry the lithium coin cell battery from the battery
holder.
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